Coaxial double-cam controlled brake

Abstract

Coaxial double-cam controlled brake, comprising a manual control assembly, a pneumatic control assembly and a brake assembly; the manual control assembly includes a brake lever, a brake lever pull rod, an outer cam and an outer cam swing rod, the pneumatic control assembly includes a cylinder support, a brake cylinder, an inner cam swing rod and an inner cam, the brake assembly includes a cam pull rod support, a cam return spring, a cam pull rod, a camshaft, a brake band assembly and a brake band suspension spring, one end of the brake band assembly is fixed to the cam pull rod support, the middle part is reset by the brake band suspension spring, and the other end, the camshaft strings the outer cam, the inner cam and the cam pull rod together, and presses the camshaft, the brake band assembly and the cam return spring onto the cam pull rod support through the cam pull rod. The structure of the present invention is reasonably designed, the manual brake lever braking and the pneumatic brake cylinder braking are independent of each other and do not affect each other. It can not only achieve quick and labor-saving pneumatic braking and reduce the labor intensity of the driller, but also retain the characteristics of safe and reliable manual braking.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and in particular to a coaxial double-cam controlled brake. Background Art

[0002] The brake of the drilling rig winch is an important component in the drilling equipment. The brake is mainly used to brake the drum and control the rotation speed of the winch. Most of the existing drilling brakes are single manual brakes or hydraulic brakes. The single manual brake is laborious to operate, and the single hydraulic brake has a complex structure and high cost. Even for a drilling rig with pneumatic auxiliary braking, its brake cylinder and brake handle jointly drive a cam or rocker arm to brake the brake. The brake cylinder and the brake handle are mechanically rigidly connected. When the brake cylinder is used alone for braking, the brake handle will be driven to move through the connecting rod at the same time, which is prone to accidents of the brake handle hitting people and has poor safety. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a coaxial double-cam controlled brake that can achieve fast and labor-saving pneumatic braking, reduce the labor intensity of the driller, and retain the safe and reliable characteristics of manual braking.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] The coaxial double-cam controlled brake includes a manual control assembly, a pneumatic control assembly, and a brake assembly; the manual control assembly includes a brake handle, a brake handle pull rod, an outer cam, and an outer cam swing rod. The lower end of the brake handle is hinged and fixed, and the middle is movably connected to the brake handle pull rod. The brake handle pull rod is movably connected to the outer cam swing rod. The outer cam swing rod is fixedly connected to the outer cam. The outer cam is connected to the brake assembly through a camshaft; the pneumatic control assembly includes a cylinder support, a brake cylinder, an inner cam swing rod, and an inner cam. The cylinder barrel of the brake cylinder is movably connected to the cylinder support, and the cylinder piston rod is movably connected to the inner cam swing rod. The inner cam swing rod is fixedly connected to the inner cam. The inner cam is connected to the brake assembly through a camshaft; the brake assembly includes a cam pull rod support, a cam return spring, a cam pull rod, a camshaft, a brake band assembly, and a brake band suspension spring. One end of the brake band assembly is fixed to the cam pull rod support, and the middle is reset by the brake band suspension spring. The other end, the camshaft strings the outer cam, the inner cam, and the cam pull rod together, and presses the camshaft, the brake band assembly, and the cam return spring onto the cam pull rod support through the cam pull rod.

[0006] Further, the middle of the brake handle is connected to the brake handle pull rod through a pin shaft. Of course, it can also be other movable connection methods.

[0007] Further, the brake handle pull rod is connected to the outer cam swing rod through a pin shaft. Of course, it can also be other movable connection methods.

[0008] Further, the outer cam swing rod and the outer cam are connected by a thread. Of course, other fixed connection methods are also possible.

[0009] Further, the cylinder barrel of the brake cylinder and the cylinder support are connected by a pin shaft. Of course, other movable connection methods are also possible.

[0010] Further, the cylinder piston rod and the inner cam swing rod are connected by a pin shaft. Of course, other movable connection methods are also possible.

[0011] Further, the inner cam swing rod and the inner cam are connected by a thread. Of course, other fixed connection methods are also possible.

[0012] Advantages of the present invention:

[0013] 1. The inner cam and the outer cam are coaxially designed and share a camshaft. The inner cam and the outer cam independently control the brake band braking without affecting each other.

[0014] 2. The inner cam is controlled by a pneumatic brake cylinder, which can achieve remote control, overwind anti-collision braking, is fast and labor-saving, and reduces the labor intensity of the driller.

[0015] 3. The outer cam is controlled by a manual brake handle, which can achieve emergency braking and parking braking, ensuring reliable braking safety.

[0016] 4. The inner cam is designed to be centered, and the outer cam is symmetrically designed on both sides. The lengths of the inner and outer cam swing rods are different and do not interfere with each other, and the structural design is reasonable.

[0017] Generally speaking, the present invention uses two sets of inner and outer cams to control the brake. The inner cam is controlled by a brake cylinder, and the two outer cams are controlled by a manual brake handle. When the brake cylinder is used for braking, the inner cam moves independently and does not link the outer cam, without affecting the operation of the brake handle, and technically completely solves the safety problem of the brake handle hitting people. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention:

[0019] Figure 2 is Figure 1 a partial side view of the illustrated embodiment;

[0020] In the figure: 1. Brake handle, 2. Brake handle pull rod, 3. Cam pull rod support, 4. Cam return spring, 5. Cam pull rod, 6. Camshaft, 7. Outer cam, 8. Outer cam swing rod, 9. Inner cam, 10. Inner cam swing rod, 11. Brake band assembly, 12. Brake cylinder, 13. Cylinder support, 14. Brake band suspension spring. Specific Embodiment

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Embodiment

[0022] Refer to Figures 1-2 , a coaxial double-cam controlled brake, comprising a manual control assembly, a pneumatic control assembly and a brake assembly; the manual control assembly includes a brake handle 1, a brake handle pull rod 2, an outer cam 7 and an outer cam swing rod 8, the lower end of the brake handle is hinged and fixed, the middle is connected to the brake handle pull rod 2 through a pin shaft, the brake handle pull rod 2 is connected to the outer cam swing rod 8 through a pin shaft, the outer cam swing rod 8 is connected to the outer cam 7 through a thread, and the outer cam 7 is connected to the brake assembly through a cam shaft 6; the pneumatic control assembly includes a cylinder support 13, a brake cylinder 12, an inner cam swing rod 10 and an inner cam 9, the cylinder barrel of the brake cylinder 12 is connected to the cylinder support 13 through a pin shaft, the cylinder piston rod is connected to the inner cam swing rod 10 through a pin shaft, the inner cam swing rod 10 is connected to the inner cam 9 through a thread, and the inner cam 9 is connected to the brake assembly through a cam shaft 6; the brake assembly includes a cam pull rod support 3, a cam return spring 4, a cam pull rod 5, a cam shaft 6, a brake band assembly 11 and a brake band suspension spring 14, one end of the brake band assembly 11 is fixed to the cam pull rod support 3, the middle part is reset by the brake band suspension spring 14, and the other end, the cam shaft 6 strings the outer cam 7, the inner cam 9 and the cam pull rod 5 together, and through the cam pull rod 5, the cam shaft 6, the brake band assembly 11 and the cam return spring 4 are pressed onto the cam pull rod support 3, and the length of the cam pull rod 5 can be adjusted to compensate for the wear of the brake band.

[0023] Working principle: <{

[0024] Manual braking: During braking, pull the brake handle 1 backward to rotate a certain angle, pull the brake handle pull rod 2, the brake handle pull rod 2 pulls the outer cam swing rod 8, the outer cam swing rod 8 drives the outer cam 7 to rotate counterclockwise around the cam shaft 6, the outer cam 7 presses the head of the brake band of the brake band assembly 11, and the brake band contracts to brake the drum friction hub; to release the brake, release the brake handle 1, and under the action of the brake band suspension spring 14 and the cam return spring 4, the brake band is released and the brake is released;

[0025] Pneumatic braking: During braking, the pneumatic reversing valve conducts air to the rodless cavity of the brake cylinder 12 to push the piston rod to extend, the piston rod pushes the inner cam swing rod 10, the inner cam swing rod 10 drives the inner cam 9 to rotate counterclockwise around the cam shaft 6, the inner cam 9 presses the head of the brake band of the brake band assembly 11, and the brake band contracts to brake the drum friction hub; to release the brake, release the pneumatic reversing valve handle, the cylinder quickly exhausts air, the piston rod returns under the spring force, and under the action of the brake band suspension spring 14 and the cam return spring 4, the brake band is released and the brake is released.

[0026] The coaxial double-cam controlled brake of the present invention has a reasonable structural design. The manual brake handle braking and the pneumatic brake cylinder braking are independent of each other and do not affect each other. It can not only achieve quick and labor-saving pneumatic braking and reduce the labor intensity of the driller, but also retain the characteristics of safe and reliable manual braking.

Claims

1. Coaxial double-cam controlled brake, characterized in that: The brake assembly comprises a manual control assembly, a pneumatic control assembly and a brake assembly; the manual control assembly comprises a brake handle, a brake handle pull rod, an outer cam and an outer cam rocker; the lower end of the brake handle is hinged and fixed, and the middle is movably connected to the brake handle pull rod; the brake handle pull rod is movably connected to the outer cam rocker; the outer cam rocker is fixedly connected to the outer cam; the outer cam is connected to the brake assembly through a camshaft; the pneumatic control assembly comprises a cylinder support, a brake cylinder, an inner cam rocker and an inner cam; the cylinder barrel of the brake cylinder is movably connected to the cylinder support; the cylinder piston rod is movably connected to the inner cam rocker; the inner cam rocker is fixedly connected to the inner cam; the inner cam is connected to the brake assembly through a camshaft; The assembly is connected through a camshaft; the brake assembly includes a cam pull rod support, a cam return spring, a cam pull rod, a camshaft, a brake band assembly and a brake band suspension spring. One end of the brake band assembly is fixed to the cam pull rod support, and the middle part is reset by the brake band suspension spring. At the other end, the camshaft strings together the outer cam, the inner cam and the cam pull rod, and presses the cam rod, the brake band assembly and the cam return spring onto the cam pull rod support through the cam pull rod; two sets of inner and outer cams are used to control the brake, the inner cam is controlled by the brake cylinder, and the outer cam is controlled by the manual brake handle. When the brake cylinder is used for braking, the inner cam moves alone and does not link the outer cam. The outer cams are arranged on both sides of the inner cam.

2. The coaxial double-cam controlled brake according to claim 1, characterized in that: The middle of the brake handle is connected to the brake handle pull rod through a pin shaft.

3. The coaxial double-cam controlled brake according to claim 1 or 2, characterized in that: The brake handle pull rod is connected to the outer cam rocker arm through a pin shaft.

4. The coaxial double-cam controlled brake according to claim 1 or 2, characterized in that: The outer cam rocker is connected to the outer cam via threads.

5. The coaxial double-cam controlled brake according to claim 1 or 2, characterized in that: The cylinder barrel of the brake cylinder is connected to the cylinder support through a pin shaft.

6. The coaxial double-cam controlled brake according to claim 1 or 2, characterized in that: The cylinder piston rod is connected to the inner cam rocker arm through a pin shaft.

7. The coaxial double-cam controlled brake according to claim 1 or 2, characterized in that: The inner cam rocker is connected to the inner cam via threads.

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