Automatic braking device for rod falling of trailer

Abstract

The invention discloses an automatic braking device for trailer rod falling, and relates to the technical field of vehicle braking control devices. The automatic braking device for the trailer falling rod comprises a braking handle, the braking handle is tensioned, an energy storage spring is in a compressed energy storage state, when a trailer traction rod is unhooked and falls, an inhaul cable can be pulled, a rotary shifting fork is driven to bounce and loosen the braking handle upwards, the energy storage spring releases elastic force, and a master cylinder shifting fork is pushed to rotate through a main pull rod; a master cylinder push rod is pressed to a brake master cylinder, brake hydraulic pressure generated by the brake master cylinder is output to a wheel brake of an axle through a pipeline, brake force is generated, the trailer is braked and stopped, automatic brake of the trailer is achieved when the trailer unhooks accidentally, and the trailer can be effectively prevented from colliding with people and facilities due to inertia loss control. Adjustment is carried out through preset spring pre-tightening force, and the requirement for braking force of a large-tonnage trailer is met.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle brake control devices, and in particular to an automatic brake device for a trailer drop rod. Background Art

[0002] A trailer is a vehicle towed by a tractor but without its own power device. Usually the tractor is called the main vehicle, and the driven vehicle towed by the main vehicle is called the trailer.

[0003] Trailers used at airports or docks are connected to the main vehicle with a tow bar. If an accident causes the trailer tow bar to be unhooked, the trailer will lose control and continue to move due to inertia, which may hit facilities and personnel in the airport or dock, causing equipment damage and personal injury. Therefore, it is required that the braking device should be able to trigger when the trailer is unhooked to stop the trailer as soon as possible.

[0004] Referring to Chinese patent publication number CN207015327U, a drop-bar brake mechanism for trailers includes a brake line joint fixing device, a mounting frame, a guide rod, an auxiliary reset spring, a frame mounting plate, a traction rod, a brake line tension adjustment device, and a brake cable. This drop-bar brake mechanism is installed on the frame body and works in conjunction with the traction rod. The traction rod swings downward to pull the brake line, thereby playing a braking role. The drop-bar brake mechanism has been structurally optimized, which can effectively avoid the situation where the brake line is stuck and cannot be reset under non-braking conditions.

[0005] However, Chinese patent publication number CN207015327U tightens the brake line by swinging the traction rod downward, and uses the brake line to pull the brake to achieve braking effect. This mechanism has the problem of too small braking force and cannot effectively stop the vehicle, especially on a trailer with a relatively large tonnage, it cannot effectively brake to control the vehicle. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an automatic braking device for a trailer drop bar, which stores elastic force by pre-compressing an energy storage spring. When the trailer drawbar drops, the elastic force of the energy storage spring is released to apply pressure to the master brake cylinder, thereby achieving the effect of boosting the braking force. By controlling the preload of the spring, the braking force can be adjusted according to the tonnage of the vehicle, and the braking force can be flexibly adjusted.

[0007] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solutions: a trailer drop rod automatic braking device, comprising: a chain, one end of the chain is connected to a traction rod, the other end of the chain is connected to a pulling and striking member, the pulling and striking member is used to rotate and strike the brake handle under the pulling of the chain, the brake handle is rotatably connected to a pull rod connecting piece through a pin shaft, one end of the pull rod connecting piece is movably connected to a main pull rod through a fork head, the bottom of the pull rod connecting piece is connected to a cross plate and a curved plate, one end of the main pull rod passes through a front spring seat and a rear spring seat in sequence and is connected to a master cylinder push rod through a brake member, a plurality of energy storage springs are arranged between the spring seat and the rear spring seat, the master cylinder push rod is used to adjust the brake oil pressure of the brake master cylinder, and the brake master cylinder is connected to the wheel brake through an output oil pipe.

[0008] Preferably, one end of the traction rod is connected to a frame, a support plate is connected to the top of the frame near the end of the traction rod, a bottom plate is connected to the top of the support plate, a side plate is connected to the same side of the bottom plate and the support plate, the side plate is connected to one side of the frame, the side of the side plate near the end of the traction rod is connected to the pulling and striking member, a switch member, an energy storage member and a brake member are connected to the top of the bottom plate, the energy storage member is arranged between the switch member and the brake member, the switch member and the brake member are arranged at both ends of the bottom plate, the distance between the switch member and the pulling and striking member is smaller than the distance between the brake member and the pulling and striking member, the switch member controls the movement of the main pull rod in the horizontal direction by pulling and releasing the brake handle, the energy storage spring is arranged to control the preload of the adjustment spring by stretching the energy storage spring, and the brake member is used to adjust the braking pressure of the master brake cylinder.

[0009] Preferably, the pulling and striking member comprises: a cable, one end of which is connected to one end of the chain, the other end of which is connected to an elastic rope, the elastic rope is connected to a connecting plate through a U-shaped plate, both ends of the connecting plate are connected to end plates, a second sliding hole is penetrated through the side surface of each end plate, a main rotating plate is arranged between the two end plates, a plurality of first positioning holes are penetrated through one side of the main rotating plate, a first plug rod is arranged at one end of the connecting plate, one end of the first plug rod passes through the second sliding hole and the first positioning hole in sequence and connects the main rotating plate with the first positioning hole The end plates are rotatably connected together, the top of the main rotating plate is connected to the slave rotating plate through a rotating cylinder, the rotating cylinder is rotatably connected to a shaft, one end of the shaft is connected to the side plate, the main rotating plate, the slave rotating plate and the rotating cylinder together constitute a rotating fork, the slave rotating plate is composed of a first plate body and a second plate body at both ends of the first plate body, a plurality of second positioning holes are opened through the side surface of the second plate body, a shift rod is inserted into the second positioning hole, and the shift rod is located directly below the brake handle, the main rotating plate is placed vertically, and the angle between the slave rotating plate and the main rotating plate is 90°-130°.

[0010] Preferably, several of the first positioning holes are equidistantly distributed along the axis of the main rotating plate, and several of the second positioning holes are equidistantly distributed along the axis of the second plate body. The length of the lever is greater than the diameter of the brake handle, and the lever is used to rotate under the drive of the main rotating plate and bump the brake handle upward.

[0011] Preferably, the switch component includes: a fixed plate, the bottom of the fixed plate is connected to the top of the bottom plate, the top of the fixed plate is connected to two side plates, the two side plates are symmetrically distributed along the axis of the fixed plate, and a third sliding hole is opened through the upper part of each side plate, the pull rod connecting plate is arranged between the two side plates, one end of the pull rod connecting plate is rotatably connected to the energy storage member through a rotating member, and the other end of the pull rod connecting plate is rotatably connected to the fixed plate through a pin shaft, a baffle rod is arranged between the two side plates, the baffle rod is rotatably connected to one end of the two side plates close to the brake handle, a connecting sleeve is arranged on the outside of the fixed plate, the inner wall of the connecting sleeve is fixedly connected to the pin shaft, the fixed plate is connected to one end of the brake handle on the side away from the fork head, and the third sliding hole is slidably connected to the rotating member.

[0012] Preferably, the pull rod connecting plate includes: a main connecting plate, the bottom of which is connected to the cross plate, the curved surface of the curved plate away from the fixed plate is composed of an arc surface, a blocking surface, a sliding surface, and a sheet surface connected in sequence, the arc surface is connected to the cross plate, the blocking surface is a vertical plane, and when the pull rod connecting plate is placed horizontally, the blocking surface is in contact with the blocking rod, the bottom of the blocking surface is located below the axis of the blocking rod, and the main connecting plate is a bow-shaped plate.

[0013] Preferably, the switch member includes: a main pull rod, one end of the main pull rod is connected to the fork, the other end of the main pull rod is connected to the brake member, two reinforcement plates are connected above the base plate, the top of one reinforcement plate is connected to the bottom of the front spring seat, and the top of the other reinforcement plate is connected to a vertical plate, a rear spring seat and a spring wire rod are arranged between the front spring seat and the vertical plate, each corner of the front spring seat is connected to the vertical plate through a spring guide rod, each of the energy storage springs is arranged on the outside of a spring guide rod, one section of the main pull rod is a threaded rod, the threaded rod passes through the inner wall of the rear spring seat and is slidably connected to the inner wall of the rear spring seat, front limit nuts and rear limit nuts are symmetrically arranged on both sides of the rear spring seat, the front limit nuts and rear limit nuts are both threadedly connected to the threaded rod, and one end of the spring guide rod passes through the rear spring seat and is slidably connected to the rear spring seat.

[0014] Preferably, the brake member comprises: a connecting member, there are two connecting members in total, one end of one of the connecting members is connected to the main pull rod, and the other end of the connecting member is movably connected to a master cylinder fork, the master cylinder fork is a shuttle plate, a first sliding hole is penetrated on one side of the lower part of the master cylinder fork, a plug hole is penetrated on one side of the upper part of the master cylinder fork, the middle part of the master cylinder fork is rotatably connected to a rod body, the plug hole is connected to a master cylinder push rod through another connecting member, one end of the master cylinder push rod is connected to a plug plate, the plug plate is slidably connected to the brake master cylinder, and one end of the brake master cylinder is connected to the wheel brake through an output oil pipe.

[0015] Preferably, the connecting member includes: an end head, one end head is connected to the main pull rod, and the other end head is connected to the master cylinder push rod, each end head is connected to an end ring through a U-shaped connecting plate, and the end ring is plugged with a second plug rod.

[0016] Beneficial effects: The present invention provides an automatic brake device for trailer rod drop. Compared with the prior art, the device has the following beneficial effects: 1. By pre-compressing the energy storage spring to store elastic force, when the trailer traction rod drops, the elastic force of the energy storage spring is released, and the pressure is applied to the brake master cylinder, which has the effect of boosting the braking force. By controlling the preload of the spring, the size of the braking force can be adjusted according to the tonnage of the vehicle. The braking force is flexibly adjusted, and the braking effect is better than that of the traditional technology.

[0017] 2. The main rotating plate and the slave rotating plate are dart-shaped, and the angle between the slave rotating plate and the main rotating plate is 90°-130°. The distance between the lever and the brake handle on the slave rotating plate is controlled by adjusting the angle between the slave rotating plate and the main rotating plate, thereby adjusting the energy transmission efficiency between the lever and the brake handle.

[0018] 3. The distance from each second positioning hole to the axis of the rotating drum is different. The farther the second positioning hole is from the center line of the rotating drum, the greater the force arm of the main rotating plate. The rotation angle, difficulty and angular velocity of the main rotating plate can be adjusted by adjusting the position of the second positioning hole.

[0019] 4. When the brake handle is placed horizontally, the brake handle is balanced in the vertical direction, but the energy storage spring is squeezed. The energy storage spring wants to return to its original state. The energy storage spring wants to push the rear spring seat, the front limit nut, and the pull rod connecting piece to move in the horizontal direction. The blocking surface is blocked by the blocking rod. The blocking rod limits the position of the curved plate, and the curved plate cannot be significantly displaced away from the brake handle, thereby ensuring the energy storage of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and enable those skilled in the relevant art to make and use the present application.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of one end of the traction rod.

[0024] Figure 3 for Figure 2 Schematic diagram of the structure after removing the tow bar and frame.

[0025] Figure 4 for Figure 3 Schematic diagram of the structure from another side perspective.

[0026] Figure 5 It is a schematic diagram of the structure of the pulling and striking parts, the switch parts, the energy storage parts and the braking parts.

[0027] Figure 6 It is a schematic diagram of the structure of the pulling and striking member.

[0028] Figure 7 This is a schematic diagram of the structure after the pull cable and elastic rope are removed from the pull-and-collision component.

[0029] Figure 8 A schematic diagram of the structure of the switch.

[0030] Fig. 9 This is an exploded view of the switch component.

[0031] Fig.10 It is a schematic diagram of the structure of the part where the tie rod connecting piece is located.

[0032] Fig.11 It is a schematic diagram of the structure of the pull rod connecting piece.

[0033] Fig.12 It is a structural schematic diagram of the energy storage component.

[0034] Fig.13 It is a schematic diagram of the structure of the energy storage spring and the rear spring seat.

[0035] Fig.14 It is a schematic diagram of the structure of the brake component.

[0036] Fig.15 This is a schematic diagram of the structure of the brake parts after removing the master cylinder, plate body, and output oil pipe.

[0037] The reference numerals in the figure are: 11, traction rod; 12, chain; 13, frame; 21, bottom plate; 22, support plate; 23, side plate; 3, pulling and striking member; 31, cable; 32, elastic rope; 33, U-shaped plate; 34, first plug rod; 35, main rotating plate; 36, shaft; 37, rotating drum; 38, secondary rotating plate; 39, lever; 4, switch member; 41, fixed plate; 42, side plate; 43, pull rod connecting plate; 431, main connecting plate; 432, cross plate; 433, curved plate; 434, arc surface; 435, blocking surface; 436, sliding surface; 437, plane; 44, connecting sleeve; 45, brake handle; 46, fixed plate; 47, blocking rod; 48, fork; 49, rotating member; 5, energy storage member; 5 1. Main tie rod; 52. Reinforcement plate; 53. Front spring seat; 54. Energy storage spring; 55. Rear spring seat; 56. Spring guide rod; 57. Vertical plate; 58. Threaded rod; 59. Front limit nut; 6. Brake member; 61. Connecting member; 611. End; 612. U-shaped connecting plate; 613. End ring; 614. Second plug rod; 62. Master cylinder fork; 63. Rod body; 64. First sliding hole; 65. Plug hole; 71. Connecting plate; 72. End plate; 73. Second sliding hole; 74. First positioning hole; 75. Second positioning hole; 76. Third sliding hole; 77. Pin shaft; 81. Brake master cylinder; 82. Master cylinder push rod; 83. Output oil pipe; 84. Plate body; 85. Plug plate; 9. Rear limit nut.

[0038] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 - Fig.15As shown, the present invention provides an automatic brake device for a trailer drop rod, comprising: a chain 12, one end of the chain 12 is connected to a traction rod 11, the other end of the chain 12 is connected to a pulling and striking member 3, the pulling and striking member 3 is used to rotate and strike a brake handle 45 under the pulling of the chain 12, the brake handle 45 is rotatably connected to a pull rod connecting plate 43 through a pin shaft 77, one end of the pull rod connecting plate 43 is movably connected to a main pull rod 51 through a fork 48, the bottom of the pull rod connecting plate 43 is connected to a cross plate 432 and a curved plate 433, one end of the main pull rod 51 is connected to a master cylinder push rod 82, the master cylinder push rod 82 is used to adjust the brake oil pressure of the brake master cylinder 81, and the brake master cylinder 81 is connected to the wheel brake through the output oil pipe 83.

[0041] One end of the traction rod 11 is connected to the frame 13, and the top of the frame 13 near the end of the traction rod 11 is connected to a support plate 22, and the top of the support plate 22 is connected to the bottom plate 21, and the bottom plate 21 and the support plate 22 are connected to a side plate 23 on the same side, and the side plate 23 is connected to one side of the frame 13, and the side of the side plate 23 near the end of the traction rod 11 is connected to the pulling and striking member 3, and the top of the bottom plate 21 is connected to a switch member 4 and a brake member 6, which are arranged at both ends of the bottom plate 21, and the distance between the switch member 4 and the pulling and striking member 3 is smaller than the distance between the brake member 6 and the pulling and striking member 3, and the switch member 4 controls the movement of the main pull rod 51 in the horizontal direction by pulling and releasing the brake handle 45, and the brake member 6 is used to adjust the braking pressure of the master brake cylinder 81.

[0042] The pulling and striking member 3 includes: a cable 31, one end of the cable 31 is connected to one end of the chain 12, the other end of the cable 31 is connected to an elastic rope 32, the elastic rope 32 is connected to a connecting plate 71 through a U-shaped plate 33, both ends of the connecting plate 71 are connected to end plates 72, each end plate 72 has a second sliding hole 73 extending through the side, a main rotating plate 35 is provided between the two end plates 72, one side of the main rotating plate 35 has a plurality of first positioning holes 74 extending through it, a first plug rod 34 is provided at one end of the connecting plate 71, one end of the first plug rod 34 passes through the second sliding hole 73 and the first positioning hole 74 in sequence and connects the main rotating plate 35 The main rotating plate 35 is rotatably connected to the end plate 72. The top of the main rotating plate 35 is connected to the slave rotating plate 38 through the rotating cylinder 37. The rotating cylinder 37 is rotatably connected to the shaft 36. One end of the shaft 36 is connected to the side plate 23. The main rotating plate 35, the slave rotating plate 38, and the rotating cylinder 37 together constitute a rotating fork. The slave rotating plate 38 is composed of a first plate body 84 and a second plate body 84 at both ends of the first plate body 84. A plurality of second positioning holes 75 are opened through the side of the second plate body 84. The second positioning hole 75 is plugged with a shift rod 39. The shift rod 39 is located directly below the brake handle 45. The angle between the slave rotating plate 38 and the main rotating plate 35 is 90°-130°.

[0043] The main rotating plate 35 and the slave rotating plate 38 are dart-shaped.

[0044] The lever 39 is located directly below the brake handle 45 , so that the lever 39 can hit one end of the brake handle 45 after being rotated.

[0045] The mass of the main rotating plate 35 is greater than the mass of the secondary rotating plate 38 , and the main rotating plate 35 is placed vertically.

[0046] When the included angle between the slave rotating plate 38 and the main rotating plate 35 is 90°, the included angle between the slave rotating plate 38 and the main rotating plate 35 is small, the lever 39 on the slave rotating plate 38 is far away from one end of the brake handle 45, and the lever 39 and the brake handle 45 are not easy to accidentally touch each other;

[0047] When the included angle between the slave rotating plate 38 and the main rotating plate 35 is 130°, the included angle between the slave rotating plate 38 and the main rotating plate 35 is large, the lever 39 on the slave rotating plate 38 is close to one end of the brake handle 45, the interaction force between the lever 39 and the brake handle 45 is large, and the energy transfer efficiency is higher.

[0048] According to the momentum theorem, Ft = mv-mu (where F is the average force, t is the time of force action, m is the mass of the object, v and u are the final velocity and initial velocity respectively), when the instantaneous impact force is the same, that is, the impulse Ft is the same, a small distance between the two objects means that the time t of their interaction may be shorter. In order to keep the impulse unchanged, the average force F between them will increase; a smaller distance is conducive to more efficient energy transfer between the two objects. Because the distance is small, the wave propagates a short distance between the objects, the energy loss is relatively small, and the energy transfer efficiency is higher.

[0049] A plurality of first positioning holes 74 are equidistantly distributed along the axis of the main rotating plate 35 , and a plurality of second positioning holes 75 are equidistantly distributed along the axis of the second plate body 84 . The length of the lever 39 is greater than the diameter of the brake handle 45 . The lever 39 is used to rotate under the drive of the main rotating plate 35 and to bump the brake handle 45 upward.

[0050] There are a number of second positioning holes 75 , and the distance between each second positioning hole 75 and the axis of the rotating drum 37 is different. The farther the second positioning hole 75 is from the center line of the rotating drum 37 , the greater the force arm of the main rotating plate 35 .

[0051] According to the lever principle, the lever arm is the vertical distance from the rotation axis 36 to the line of action of the force. The farther the main rotating plate 35 is from the rotation axis 36, the longer the lever arm. When the pulling force applied by the main rotating plate 35 remains unchanged, the increase in the lever arm increases the torque generated by the pulling force on the rotating plate, because the torque is equal to the product of the force and the lever arm. This makes it easier for the main rotating plate 35 to rotate around the rotation axis 36, or the main rotating plate 35 rotates at a larger angle in the same time.

[0052] From the rotation law M=Iα (where M is the resultant external torque, I is the moment of inertia, and α is the angular acceleration), it can be seen that when the moment of inertia of the main rotating plate 35 remains unchanged, the angular acceleration of the main rotating plate 35 will increase due to the increase in the torque generated by the pulling force. This means that when the main rotating plate 35 starts to rotate from rest, it can reach a certain angular velocity faster, or its angular velocity changes faster during the rotation process.

[0053] The elastic rope 32, which is farther from the axis of the rotating drum 37, can more effectively change the rotation state of the main rotating plate 35 when the rotating plate is pulled. By adjusting the distance between the pull rope and the rotating shaft 36, the rotation speed and angle of the main rotating plate 35 can be accurately controlled, so that the main rotating plate 35 can better meet the working requirements.

[0054] The pulling force required for the pull rope may be reduced: According to the lever balance condition, in order to achieve the same rotation effect of the rotating plate, when the pull rope is farther away from the rotating shaft 36 (the lever arm is larger), the pulling force required may be reduced. This is because after the lever arm is increased, a smaller force through a larger lever arm can produce the same torque as the original larger force through a smaller lever arm, thereby achieving the same rotation effect. This can save effort in practical applications. For example, in some manually operated rotating plate devices, people can more easily rotate the rotating plate by connecting the pull rope at a position farther away from the rotating shaft 36.

[0055] A plurality of first positioning holes 74 are arranged at equal intervals to accommodate brake handles 45 of different lengths, ensuring that the lever 39 passing through the first positioning hole 74 is located directly below one end of the brake handle 45 and minimizing the distance between the brake handle 45 and the lever 39.

[0056] The switch member 4 includes: a fixed plate 41, the bottom of the fixed plate 41 is connected to the top of the bottom plate 21, the top of the fixed plate 41 is connected to two side plates 42, the two side plates 42 are symmetrically distributed along the axis of the fixed plate 41, and a third sliding hole 76 is penetrated through the upper part of each side plate 42, a pull rod connecting piece 43 is arranged between the two side plates 42, one end of the pull rod connecting piece 43 is rotatably connected to the energy storage member 5 through a rotating member 49, and the other end of the pull rod connecting piece 43 is rotatably connected to the fixed plate 46 through a pin shaft 77, a baffle rod is arranged between the two side plates 42, the baffle rod is rotatably connected to one end of the two side plates 42 close to the brake handle 45, a connecting sleeve 44 is arranged on the outside of the fixed plate 46, the inner wall of the connecting sleeve 44 is fixedly connected to the pin shaft 77, the fixed plate 46 is connected to one end of the brake handle 45 on the side away from the fork head 48, and the third sliding hole 76 is slidably connected to the rotating member 49.

[0057] The pull rod connecting piece 43 includes: a main connecting piece 431, the bottom of the main connecting piece is connected to the horizontal plate, the curved surface of the curved plate 433 away from the fixed plate 46 is composed of an arc surface 434, a blocking surface 435, a sliding surface 436, and a sheet surface connected in sequence, the arc surface 434 is connected to the horizontal plate 432, the blocking surface 435 is a vertical plane 437, when the pull rod connecting piece 43 is placed horizontally, the blocking surface 435 is in contact with the blocking rod, and the bottom of the blocking surface 435 is located below the axis of the blocking rod 47, and the main connecting piece 431 is a bow-shaped piece.

[0058] The brake member 6 includes: a connecting member 61, there are two connecting members 61, one end of each connecting member 61 is connected to the main pull rod 51, and the other end of the connecting member 61 is movably connected to a master cylinder fork 62, and the master cylinder fork 62 is a shuttle-shaped plate. A first sliding hole 64 is penetrated on one side of the lower part of the master cylinder fork 62, and a plug hole 65 is penetrated on one side of the upper part of the master cylinder fork 62. The middle part of the master cylinder fork 62 is rotatably connected to the rod body 63, and the plug hole 65 is connected to the master cylinder push rod 82 through another connecting member 61. One end of the master cylinder push rod 82 is connected to a plug plate 85, and the plug plate 85 is slidably connected to the brake master cylinder 81, and one end of the brake master cylinder 81 is connected to the wheel brake through the output oil pipe 83.

[0059] The switch member 4 includes: a main pull rod 51, one end of the main pull rod 51 is connected to the fork 48, the other end of the main pull rod 51 is connected to the brake member 6, two reinforcing plates 52 are connected above the bottom plate 21, the top of one reinforcing plate 52 is connected to the bottom of the front spring seat 53, the top of the other reinforcing plate 52 is connected to the vertical plate 57, a rear spring seat 55 and a spring wire rod are arranged between the front spring seat 53 and the vertical plate 57, each corner of the front spring seat 53 is connected to the vertical plate 57 through a spring guide rod 56, each energy storage spring 54 is arranged on the outside of a spring guide rod 56, and one section of the main pull rod 51 is a threaded rod 58, and the threaded rod 58 passes through the inner wall of the rear spring seat 55 It is slidably connected to the inner wall of the rear spring seat 55, and a front limit nut 59 and a rear limit nut 9 are symmetrically arranged on both sides of the rear spring seat 55, and the front limit nut 59 and the rear limit nut 9 are both threadedly connected to the threaded rod 58. One end of the spring guide rod 56 passes through the rear spring seat 55 and is slidably connected to the rear spring seat 55. The energy storage member 5 is arranged between the switch member 4 and the brake member 6. The energy storage spring 54 is arranged to adjust the preload of the spring by controlling the stretching of the energy storage spring 54. One end of the main pull rod 51 passes through the front spring seat 53 and the rear spring seat 55 in sequence and is connected to the master cylinder push rod 82 through the brake member 6. A plurality of energy storage springs 54 are arranged between the spring seat and the rear spring seat 55.

[0060] The connecting member 61 includes: an end 611, one end 611 is connected to the main pull rod 51, and the other end 611 is connected to the master cylinder push rod 82. Each end 611 is connected to an end ring 613 through a U-shaped connecting plate 612, and the end ring 613 is plugged with a second plug rod 614.

[0061] When in use, the brake handle 45 is pressed downward to a horizontal position. During this process, the brake handle 45 moves toward the brake handle 45 with the connecting sleeve 44, the fixing plate 46, the pull rod connecting plate 43, the main pull rod 51, the rear spring seat 55, the connecting piece 61, and the bottom end of the master cylinder fork 62. The rear spring seat 55 squeezes the energy storage spring 54, the energy storage spring 54 is compressed, the master cylinder fork 62 is rotationally connected to the shaft 36, the master cylinder fork 62 rotates, and the top end of the master cylinder fork 62 moves away from the brake handle 45 with another connecting piece 61 and the master cylinder push rod 82 and the plug plate 85 thereon.

[0062] When the brake handle 45 moves to a horizontal position, the master cylinder push rod 82 moves away from the brake master cylinder 81, and the brake master cylinder 81 is in a free state and does not output brake fluid pressure; the main connecting pipe and the curved plate 433 also move to a horizontal state, and the blocking surface 435 of the curved plate 433 is close to or close to the arc surface 434 of the blocking rod 47 (which can be adjusted according to actual production needs). When the brake handle 45 is placed horizontally, the brake handle 45 is subjected to balanced force in the vertical direction, but the energy storage spring 54 is squeezed, and the energy storage spring 54 wants to return to its original state. The energy storage spring 54 wants to push the rear spring seat 55, the front limit nut 59, and the pull rod connecting piece 43 to move in the horizontal direction, and the blocking surface 435 is blocked by the blocking rod 47. The blocking rod limits the position of the curved plate 433, and the curved plate 433 cannot make a significant displacement in the direction away from the brake handle 45 (displacement visible to the naked eye, a displacement greater than 0.1 cm is considered to be a significant displacement), thereby ensuring the energy storage of the spring.

[0063] One end of the chain 12 is connected to the traction rod 11, and the other end is connected to the cable 31. The other end of the cable 31 is connected to the first positioning of the main rotating plate 35. The main rotating plate 35 is connected to two slave rotating plates 38 through a rotating drum 37. The two ends of the lever 39 are respectively placed in the second positioning holes 75 of the two slave rotating plates 38. The lever 39 is arranged below the brake handle 45. The rotating drum 37 is loosely mounted on the shaft 36, and the rotating drum 37 can rotate around the shaft 36.

[0064] When the traction rod 11 falls, the falling traction rod 11 pulls the chain 12 and the cable 31, and the cable 31 drives the rotating fork (the main rotating plate 35, the slave rotating plate 38, and the rotating drum 37 together constitute the rotating fork) to rotate around the axis 36, and the main rotating plate 35 approaches the U-shaped plate 33, and the slave rotating plate 38 and the lever 39 rotate upward with the rotating drum 37, and the slave rotating plate 38 moves away from the U-shaped plate 33. The lever 39 moves upward and hits the brake handle 45, and the brake handle 45 bounces up and releases with the connecting sleeve 44 and the pull rod connecting piece 43, and the end of the pull rod connecting piece 43 away from the brake handle 45 rotates around the rotating end, and the other end of the pull rod connecting piece 43 is lifted upward, and the pull rod connecting piece 43 is separated from the blocking rod, and the blocking rod no longer blocks the pull rod connecting piece The connecting piece 43 and the energy storage spring 54 are no longer pulled by the main pull rod 51 and the pull rod connecting piece 43, and the energy storage spring 54 is stretched. The energy storage spring 54 pushes the rear spring seat 55 (the rear spring seat 55 is slidingly connected to the spring guide rod 56) to move in the direction away from the brake handle 45, and the rear spring seat 55 pushes the front nut and the main pull rod 51 to move in the direction away from the brake handle 45. The main pull rod 51 pushes a connecting piece 61 and the master cylinder fork to rotate, and the master cylinder fork moves with the master cylinder push rod 82 and the plug plate 85 in the direction away from the brake handle 45. The plug plate 85 is pushed toward the brake master cylinder 81, generating brake oil pressure, which is passed to the wheel brake through the output oil pipe 83, generating braking force, and stopping the trailer.

[0065] The magnitude of the brake pressure output by the master brake cylinder 81 is determined by the preload of the energy storage spring 54. The energy storage spring 54 can be compressed differently by adjusting the position of the rear spring seat 55, thereby adjusting the preload of the energy storage spring 54. The front limit nut 59 and the rear limit nut 9 are both threadedly connected to the threaded rod 58. When adjusting (mainly referring to the need to increase the preload), the compression of the energy storage spring 54 is determined, and the rear limit nut 9 is first screwed and moved to a predetermined position in the direction close to the brake handle 45, and then the rear spring seat 55 (the rear spring seat 55 is slidably connected to the main pull rod 51) is pushed by the screwed front limit nut 59 to move in the direction close to the brake handle 45 until the rear spring seat 55 abuts against the rear limit nut 9. The compression of the energy storage spring 54 can be increased before pressing the brake handle 45, and the adjustment method is simple and effective.

[0066] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A trailer drop rod automatic braking device, characterized in that: include: A chain (12), one end of the chain (12) is connected to a traction rod (11), the other end of the chain (12) is connected to a pulling and striking member (3), the pulling and striking member (3) is used to rotate and strike a brake handle (45) under the pulling of the chain (12), the brake handle (45) is rotatably connected to a pull rod connecting piece (43) through a pin shaft (77), one end of the pull rod connecting piece (43) is movably connected to a main pull rod (51) through a fork head (48), and the pull rod connecting piece (43) is connected to the brake handle (45) through a pin shaft (77). ) is connected to the bottom of a brake master cylinder (81) with a horizontal plate (432) and a curved plate (433), one end of the main pull rod (51) passes through a front spring seat (53) and a rear spring seat (55) in sequence and is connected to a master cylinder push rod (82) through a brake member (6), a plurality of energy storage springs (54) are arranged between the spring seat and the rear spring seat (55), the master cylinder push rod (82) is used to adjust the brake oil pressure of the brake master cylinder (81), and the brake master cylinder (81) is connected to a wheel brake through an output oil pipe (83).

2. The trailer drop rod automatic brake device according to claim 1, characterized in that: One end of the traction rod (11) is connected to a vehicle frame (13), a top of the vehicle frame (13) close to one end of the traction rod (11) is connected to a support plate (22), a top of the support plate (22) is connected to a bottom plate (21), a side plate (23) is connected to the same side of the bottom plate (21) and the support plate (22), the side plate (23) is connected to one side of the vehicle frame (13), a side surface of the side plate (23) close to one end of the traction rod (11) is connected to a pulling and striking member (3), a top of the bottom plate (21) is connected to a switch member (4), an energy storage member (5), and a brake member (6), The energy storage component (5) is arranged between the switch component (4) and the brake component (6); the switch component (4) and the brake component (6) are arranged at two ends of the bottom plate (21); the distance between the switch component (4) and the pulling and striking component (3) is smaller than the distance between the brake component (6) and the pulling and striking component (3); the switch component (4) controls the movement of the main pull rod (51) in the horizontal direction by pulling and releasing the brake handle (45); the energy storage spring (54) is arranged to control the preload of the spring by stretching the energy storage spring (54); and the brake component (6) is used to adjust the brake pressure of the master brake cylinder (81).

3. The trailer drop rod automatic braking device according to claim 1, characterized in that: The pulling and striking member (3) comprises: a cable (31), one end of the cable (31) is connected to one end of the chain (12), the other end of the cable (31) is connected to an elastic rope (32), the elastic rope (32) is connected to a connecting plate (71) through a U-shaped plate (33), both ends of the connecting plate (71) are connected to end plates (72), a second sliding hole (73) is penetrated through the side surface of each end plate (72), a main rotating plate (35) is arranged between the two end plates (72), a plurality of first positioning holes (74) are penetrated through one side of the main rotating plate (35), a first plug rod (34) is arranged at one end of the connecting plate (71), one end of the first plug rod (34) passes through the second sliding hole (73) and the first positioning hole (74) in sequence to connect the main rotating plate (35) with the end plate (7 2) are rotatably connected together, the top of the main rotating plate (35) is connected to a slave rotating plate (38) through a rotating cylinder (37), the rotating cylinder (37) is rotatably connected to a shaft (36), one end of the shaft (36) is connected to the side plate (23), the main rotating plate (35), the slave rotating plate (38) and the rotating cylinder (37) together constitute a rotating fork, the slave rotating plate (38) is composed of a first plate body (84) and a second plate body (84) at both ends of the first plate body (84), a plurality of second positioning holes (75) are opened through the side surface of the second plate body (84), a shifting rod (39) is inserted into the second positioning hole (75), and the shifting rod (39) is located directly below the brake handle (45), the main rotating plate (35) is placed vertically, and the angle between the slave rotating plate (38) and the main rotating plate (35) is 90°-130°.

4. The trailer drop rod automatic brake device according to claim 3, characterized in that: A plurality of the first positioning holes (74) are equidistantly distributed along the axis of the main rotating plate (35), and a plurality of the second positioning holes (75) are equidistantly distributed along the axis of the second plate body (84). The length of the shifting rod (39) is greater than the diameter of the brake handle (45). The shifting rod (39) is used to rotate under the drive of the main rotating plate (35) and to bump the brake handle (45) upward.

5. The trailer drop rod automatic brake device according to claim 2, characterized in that: The switch component (4) comprises: a fixed plate (41), the bottom of the fixed plate (41) is connected to the top of the bottom plate (21), the top of the fixed plate (41) is connected to two side plates (42), the two side plates (42) are symmetrically distributed along the axis of the fixed plate (41), and a third sliding hole (76) is penetrated through the upper part of each side plate (42), the pull rod connecting piece (43) is arranged between the two side plates (42), one end of the pull rod connecting piece (43) is rotatably connected to the energy storage component (5) through a rotating member (49), and the pull rod connecting piece (43) is connected to the energy storage component (5) through a rotating member (49). The other end of the rod connecting plate (43) is rotatably connected to a fixing plate (46) via a pin shaft (77); a stop rod is arranged between the two side plates (42); the stop rod is rotatably connected to one end of the two side plates (42) close to the brake handle (45); a connecting sleeve (44) is arranged outside the fixing plate (46); the inner wall of the connecting sleeve (44) is fixedly connected to the pin shaft (77); the fixing plate (46) is connected to one end of the brake handle (45) away from the fork head (48); and the third sliding hole (76) is slidably connected to the rotating member (49).

6. The trailer drop rod automatic brake device according to claim 5, characterized in that: The pull rod connecting plate (43) includes: a main connecting plate (431), the bottom of which is connected to the transverse plate, the curved surface of the curved plate (433) away from the fixed plate (46) is composed of an arc surface (434), a blocking surface (435), a sliding surface (436), and a sheet surface connected in sequence, the arc surface (434) is connected to the transverse plate (432), the blocking surface (435) is a vertical plane (437), when the pull rod connecting plate (43) is placed horizontally, the blocking surface (435) fits with the blocking rod, the bottom of the blocking surface (435) is located below the axis of the blocking rod (47), and the main connecting plate (431) is a bow-shaped plate.

7. The trailer drop rod automatic brake device according to claim 2, characterized in that: The switch member (4) comprises: a main pull rod (51), one end of the main pull rod (51) is connected to the fork (48), the other end of the main pull rod (51) is connected to the brake member (6), two reinforcing plates (52) are connected above the bottom plate (21), the top of one reinforcing plate (52) is connected to the bottom of the front spring seat (53), the top of the other reinforcing plate (52) is connected to the vertical plate (57), a rear spring seat (55) and a spring wire rod are arranged between the front spring seat (53) and the vertical plate (57), each corner of the front spring seat (53) is connected to the vertical plate (57) through a spring guide rod (56), and the front spring seat (53) is connected to the vertical plate (57) by a spring guide rod (56). 7) connection, each of the energy storage springs (54) is arranged on the outside of a spring guide rod (56), one section of the main pull rod (51) is a threaded rod (58), the threaded rod (58) passes through the inner wall of the rear spring seat (55) and is slidably connected to the inner wall of the rear spring seat (55), the two sides of the rear spring seat (55) are symmetrically provided with a front limit nut (59) and a rear limit nut (9), the front limit nut (59) and the rear limit nut (9) are both threadedly connected to the threaded rod (58), and one end of the spring guide rod (56) passes through the rear spring seat (55) and is slidably connected to the rear spring seat (55).

8. The trailer drop rod automatic brake device according to claim 2, characterized in that: The brake member (6) comprises: a connecting member (61), wherein there are two connecting members (61), one end of one of the connecting members (61) is connected to the main pull rod (51), and the other end of the connecting member (61) is movably connected to a master cylinder fork (62), wherein the master cylinder fork (62) is a shuttle plate, a first sliding hole (64) is penetrated through one side of the lower part of the master cylinder fork (62), and a plug hole (65) is penetrated through one side of the upper part of the master cylinder fork (62), the middle part of the master cylinder fork (62) is rotatably connected to a rod body (63), and the plug hole (65) is connected to a master cylinder push rod (82) through another connecting member (61), one end of the master cylinder push rod (82) is connected to a plug plate (85), and the plug plate (85) is slidably connected to a brake master cylinder (81), and one end of the brake master cylinder (81) is connected to a wheel brake through an output oil pipe (83).

9. The trailer drop rod automatic brake device according to claim 8, characterized in that: The connecting member (61) includes an end head (611), one end head (611) is connected to the main pull rod (51), and the other end head (611) is connected to the master cylinder push rod (82), each end head (611) is connected to an end ring (613) via a U-shaped connecting plate (612), and the end ring (613) is plugged with a second plug rod (614).

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