Anti-loosening device and plunger pump

An anti-loosening device, comprising:

• a first bracket, comprising:
• a first clamping part defining a first accommodating space;
• a first connecting part extending in a first direction and fixedly connected to the first clamping part;
• and
• a limiting part fixedly connected to the first clamping part via the first connecting part, wherein the limiting part protrudes from the first connecting part in a second direction perpendicular to the first direction;
• and
• a second bracket, comprising:
• a second clamping part defining a second accommodation space, wherein the second clamping part is opposite to the first clamping part in the first direction, and
• a second connecting part extending in the first direction and fixedly connected to the second clamping part, and
• an elastic structure connecting the first bracket and the second bracket and configured to control a relative movement of the first bracket and the second bracket in the first direction,
• wherein the first clamping part is consisted of a first plate-shaped structure and a second plate-shaped structure,
• the first plate-shaved structure is overlapped with the first connecting part in the first direction, and the second plate-shaped structure is located at an end of the first plate-shaped structure away from the limiting part in the second direction,
• the second clamping part comprises a third plate-shaped structure, a fourth plate-shaped structure and a fifth plate-shaped structure which are connected to the third plate-shaped structure,
• in the first direction, the third plate-shaped structure is overlapped with the second connecting part, and
• in the second direction, the fourth plate-shaped structure is located at an end of the third plate-shaped structure close to the limiting part, and the fifth plate-shaped structure is located at an end of the third plate-shaped structure away from the limiting part.