Support structure for a horizontal jack

Abstract

This application relates to the field of horizontal jack technology, and in particular to a support structure for a horizontal jack, comprising a base frame, a lifting cylinder, a return valve, a lifting arm, and a transmission plate. The transmission plate is connected to the lifting cylinder. A protective base is fixed on the base frame, and a first telescopic rod is hinged to the protective base. A second telescopic rod slides coaxially within the first telescopic rod, and the other end of the second telescopic rod is hinged to the transmission plate. The first and second telescopic rods can extend as the lifting arm is raised, and the first and second telescopic rods are mutually locked in multiple positions along the extension direction. Simultaneously, the first telescopic rod is also provided with an unlocking mechanism to unlock the connection between the first and second telescopic rods. This application utilizes auxiliary mechanical support to provide protection for the lifting arm during its raised state, thereby improving the safety hazard caused by ineffective support in the event of hydraulic failure during lifting.

Description

Technical Field

[0001] This application relates to the field of horizontal jack technology, and in particular to a support structure for a horizontal jack. Background Technology

[0002] A horizontal jack is a lightweight lifting device that uses a rigid lifting component as its working device to lift heavy objects within a short stroke via a top support. It is mainly used in factories, mines, transportation and other departments for vehicle repair and other lifting and support work.

[0003] Chinese Patent Publication No. CN202704938U, published on January 30, 2013, discloses a novel horizontal jack. The jack includes a chassis, a front wall and a rear wall located on the outermost side of the chassis. A pressure block for connecting a handle and a support plate for mounting a support arm are hinged between the front and rear walls. A hydraulic cylinder is fixed below the pressure block. When the pressure block is pressed down, hydraulic pressure is injected into the cylinder. A triangular transmission plate is provided between the cylinder and the support arm. The fixed point of the transmission plate is hinged to the support plate, and the two bottom corners of the transmission plate are respectively hinged to the piston rod of the cylinder and the transmission plate. When the cylinder is filled with oil and extends, it pushes the transmission plate to move, thereby driving the support arm to move and lifting it.

[0004] However, in the aforementioned technologies, the lifting of the boom relies entirely on the push of the hydraulic cylinder. When the hydraulic system of the hydraulic cylinder fails and loses its thrust, the lifted object may fall downwards under its own weight, which may lead to a safety accident and pose a safety hazard. Summary of the Invention

[0005] This application provides a support structure for a horizontal jack, which uses auxiliary mechanical supports such as telescopic rods to provide protection for the lifting arm during the lifting process. Specifically, the telescopic rods extend synchronously with the lifting arm and are automatically locked in multiple positions in the extension direction. The extended and locked telescopic rods can support the lifting arm in the event of a failure of the lifting cylinder, thereby improving the safety hazard caused by the inability to provide effective support when hydraulic failure occurs during the lifting process.

[0006] The support structure for a horizontal jack provided in this application adopts the following technical solution:

[0007] A support structure for a horizontal jack includes a base frame, a lifting cylinder fixed to the base frame, a return valve for depressurizing the lifting cylinder, a lifting arm hinged to the base frame, and a transmission plate fixed to the lifting arm. The transmission plate is connected to the lifting cylinder. A protective base is fixed to the base frame near the fixed end of the lifting cylinder. A first telescopic rod is hinged to the protective base. A second telescopic rod is coaxially and slidably disposed inside the first telescopic rod. The end of the second telescopic rod away from the protective base is hinged to the transmission plate. Several slots are formed along the length of the first telescopic rod. Several elastic plates are fixed to the end of the second telescopic rod that is inserted into the first telescopic rod. Insert blocks are fixed to the outer wall of the free end of each elastic plate. The insert blocks can be inserted into the slots. A guide surface is formed on the side of the insert block facing the transmission plate, which can abut against the inner wall of the slot. The first telescopic rod is also provided with an unlocking mechanism for driving the insert blocks out of the slots.

[0008] By adopting the above technical solution, the extension of the lifting cylinder drives the transmission plate to rotate, thereby raising the lifting arm. The rotation of the transmission plate pulls the first and second telescopic rods to extend, causing the elastic plate to deform inwards under the guidance of the guide surface. This causes the insert block to disengage from the slot, allowing the telescopic rod to extend synchronously with the lifting arm. Furthermore, the first and second telescopic rods can be automatically locked in multiple positions along their extension direction. In the event of a hydraulic system malfunction during lifting, the insert block remains inserted in the slot under the action of the elastic plate, preventing the telescopic rod from retracting. The telescopic rod can then replace the lifting cylinder in supporting the transmission plate, reducing the probability of the lifting arm falling under the weight of the supported object, improving protection and safety, and addressing the safety hazard caused by ineffective support during lifting when hydraulic failure occurs. When the lifting arm is in the normal lowering state, the unlocking mechanism disengages the insert block from the slot, allowing the telescopic rod to retract synchronously with the lowering of the lifting arm. This ensures the jack has protective capabilities without affecting its normal operation.

[0009] Optionally, the unlocking mechanism includes a main rope, a linkage part for pulling the main rope away from the transmission plate, and a control part for controlling the activation of the linkage part. The main rope is located inside the first telescopic rod and the second telescopic rod, and several branch ropes are fixedly connected to the main rope. The free ends of the branch ropes are all fixed to the free ends of the corresponding elastic plates. The elastic force of the elastic plates is greater than the tension of the branch ropes on the insertion block.

[0010] By adopting the above technical solution, when the lifting arm needs to be lowered normally, the control unit activates the linkage unit, thereby pulling the main rope, moving the branch rope, and causing the elastic plate of the secondary rod to move closer to the center at the same time, realizing the unlocking action of pulling the insert out of the slot, and allowing the telescopic rod to return to the free telescopic state.

[0011] Optionally, the unlocking mechanism further includes a winding box fixed to the first telescopic rod, the winding box being located on the side of the linkage unit away from the second telescopic rod; a winding shaft is fixed inside the winding box, a winding frame is rotatably mounted on the winding shaft, and the same worm spring is fixedly connected between the winding shaft and the winding frame; the end of the main rope away from the second telescopic rod is fixed and wound around the outer wall of the winding frame; the free end of the main rope can pass through the winding box and coincide with the center line of the length direction of the first telescopic rod.

[0012] By adopting the above technical solution, the main rope can always be kept taut. When the linkage clamps and pulls the main rope, the main rope is pulled while taut. The distance the linkage pulls the main rope is the distance the branch rope moves, which reduces the situation where the plug cannot be completely pulled out of the slot due to insufficient movement of the branch rope.

[0013] Optionally, a traction spring is fixed to one end of the main rope away from the winding box, and the other end of the traction spring is fixedly connected to the inner wall of the second telescopic rod away from the first telescopic rod.

[0014] By adopting the above technical solution, the traction spring and the elastic plate can work together to pull the main rope to resist the tension of the worm spring on the main rope, thereby reducing the traction force on the branch rope and reducing the probability of unnecessary displacement of the plug during the extension of the telescopic rod, thus improving the protective performance during the lifting state.

[0015] Optionally, the linkage includes a mounting frame fixed to the take-up box, a sliding frame slidably disposed on the mounting frame along the length of the first telescopic rod, two clamping blocks slidably disposed on the sliding frame, and a clamping spring fixed on the sliding frame for pushing the clamping blocks to slide closer to the main rope; the linkage also includes a linkage rod slidably disposed on the take-up box along the length of the main rope, the linkage rod abutting between the two clamping blocks; the linkage rod also has a groove, the groove being located on the side of the clamping block near the second telescopic rod, and the clamping block, after entering the groove, can abut against the inner wall of the groove near the second telescopic rod, and simultaneously abut against the main rope, at which point the frictional force of the clamping block on the main rope is greater than the tension of the elastic sheet on the main rope; a traction rope is fixedly connected to the end of the linkage rod away from the second telescopic rod, and the end of the traction rope away from the linkage rod is connected to the control unit.

[0016] By adopting the above technical solution, the control unit can drive the linkage rod to slide away from the second telescopic rod, thereby driving the clamping block to approach the groove and enter the groove under the push of the clamping spring. At this time, the clamping block can clamp the main rope. Then the linkage rod continues to slide away from the second telescopic rod. At this time, the clamping block abuts against the inner wall of the groove, thereby driving the sliding frame to slide together, so that the clamping block pulls the main rope away from the second telescopic rod, realizing the clamping and reverse pulling of the main rope.

[0017] Optionally, the control unit includes a control frame fixed to the base frame and a control shaft rotatably mounted on the base frame. The traction rope is fixed and wound around the control shaft, and a control gear is fixedly connected to the end of the control shaft. A pedal is slidably mounted on the control frame in the vertical direction, and a control rack is fixedly connected to the pedal. The control rack meshes with the control gear.

[0018] By adopting the above technical solution, when the operator steps on the pedal and moves the pedal, the control rack can be moved at the same time, which in turn drives the control gear to rotate. When the control gear rotates, it can drive the control shaft to rotate synchronously, thereby causing the traction rope to wind. After the traction rope moves, it can drive the linkage rod to move, thus realizing the linkage between the control unit and the linkage unit.

[0019] Optionally, each of the clamping blocks has an arc-shaped groove on its opposite sidewall, the arc-shaped groove can abut against the main rope, and the inner wall of the arc-shaped groove is provided with a friction pattern.

[0020] By adopting the above technical solution, the arc groove can increase the contact area between the clamping block and the main rope, and the friction pattern can enhance the friction between the clamping block and the main rope, which is conducive to the clamping and pulling of the main rope by the clamping block being more stable.

[0021] Optionally, the side wall of the groove away from the second telescopic rod is provided with an arc surface that forces the two clamping blocks to separate, and the clamping blocks abut against the arc surface; and a return spring is fixedly provided on the linkage rod to drive the linkage rod to slide closer to the second telescopic rod.

[0022] By adopting the above technical solution, when the operator leaves the pedal, the return spring can drive the linkage rod to reset and pull the traction rope, control shaft and control rack to reset. At this time, the two clamping blocks slide and separate from each other under the reset force of the linkage rod and the guiding action of the arc surface. At this time, the clamping action of the clamping blocks on the main rope can be released, allowing the main rope to return to a free state and the elastic plate to return to its deformation. The insert can continue to be inserted into the slot to restore the locked state, so as to restore the protective function of the first telescopic rod and the second telescopic rod during lifting.

[0023] Optionally, an abutment block is also fixedly provided on the linkage rod. The abutment block is located on the side of the arc surface away from the second telescopic rod, and the clamping block can abut against the abutment block.

[0024] By adopting the above technical solution, when the linkage rod is reset, the clamping block slides and separates under the guidance of the arc surface. At this time, the separated clamping block can abut against the abutment block. The linkage rod continues to reset and move. At this time, the abutment block can push the clamping block and the sliding frame to slide closer to the second telescopic rod, which is conducive to the reset of the sliding frame, so as to facilitate the unlocking of the insertion block next time.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The auxiliary mechanical support provides protection during the lifting of the boom. The telescopic rod extends synchronously with the lifting boom and is automatically locked in multiple positions in the extension direction. The extended and locked telescopic rod can support the lifting boom in the event of a failure of the lifting cylinder, thereby improving the safety hazard caused by the inability to provide effective support when hydraulic failure occurs during the lifting process.

[0027] 2. When the lifting arm is lowered, the unlocking mechanism is first activated by the control unit, which restores the telescopic rod to its free extension and retraction state. Then, the lifting cylinder is used to drive the lifting arm to lower normally, so that even if the jack is equipped with a safety function, it will not affect its normal working state. Attached Figure Description

[0028] Figure 1 This is a perspective view of an embodiment of this application.

[0029] Figure 2 This is an internal structural diagram viewed from below according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the internal structure of the fixed end of the lifting cylinder in an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the protective mechanism according to an embodiment of this application.

[0032] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0033] Figure 6 This is a schematic diagram of the winding section in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the linkage part in an embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the clamping block and linkage rod in an embodiment of this application.

[0036] Figure 9 yes Figure 3 Enlarged view of point B in the middle.

[0037] Explanation of reference numerals in the attached drawings: 1. Base frame; 101. Wheel; 102. Lifting cylinder; 103. Short connecting rod frame; 104. Pump body; 105. Lifting handle; 106. Lifting arm; 107. Transmission plate; 108. Return valve; 2. Protective mechanism; 3. Protective base; 4. Telescopic rod; 401. First telescopic rod; 402. Second telescopic rod; 403. Slot; 404. Elastic plate; 405. Insert block; 406. Guide surface; 407. Protective platform; 5. Unlocking mechanism; 6. Main rope; 601. Traction spring; 602. Support rope; 7. Rewinding section; 701. Rewinding box; 702. Rewinding shaft; 703. Rewinding frame; 704. 8. Snail spring; 801. Linkage part; 802. Mounting bracket; 803. First sliding groove; 804. Sliding bracket; 805. Second sliding groove; 806. Clamping block; 807. Arc groove; 808. Lug block; 809. Traction frame; 810. Linkage rod; 810a. Sliding section; 810b. Linkage section; 811. Reset block; 812. Reset spring; 813. Groove; 814. Arc surface; 815. Abutment block; 816. Traction rope; 9. Control part; 901. Control frame; 902. Control shaft; 903. Control gear; 904. Through groove; 905. Pedal; 906. Control rack. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0039] This application discloses a support structure for a horizontal jack, referring to... Figure 1 and Figure 2 The system includes a base frame 1 placed on a horizontal surface. Four wheels 101 are evenly distributed and rotatably mounted on the outer wall of the base frame 1. A lifting cylinder 102 is also fixedly mounted on the base frame 1. The extension and retraction direction of the lifting cylinder 102 is parallel to the ground. A short connecting rod frame 103 is fixedly mounted on the output end of the lifting cylinder 102. A retractable pump body 104 is mounted on the end of the lifting cylinder 102 away from its output end. The retraction of the pump body 104 can drive the lifting cylinder 102 to extend. A handle 105 is also hinged to the base frame 1 via a pivot. A handle is inserted into the handle 105. When the handle 105 is pressed down, it can abut against and press the pump body 104 to retract, thereby driving the lifting cylinder 102 to extend. A lifting arm 106 is also hinged to the base frame 1 via a pivot. A triangular transmission plate 107 is fixedly mounted on the lifting arm 106. The transmission plate 107 is hinged to the short connecting rod frame 103.

[0040] Reference Figure 2 and Figure 3The lifting cylinder 102, located away from its output end, is equipped with a pressure relief return valve 108. The return valve 108 is connected to a rotating shaft inside the lifting handle 105. When the handle is turned, it rotates the internal shaft of the lifting handle 105, thereby rotating the return valve 108. The rotation of the return valve 108 causes the lifting cylinder 102 to depressurize and retract. Two sets of protective mechanisms 2 are also fixedly installed on the base frame 1, located on both sides of the return valve 108.

[0041] Reference Figure 3 and Figure 4 Each set of protective mechanisms 2 includes a protective base 3 and a set of telescopic rods 4. The protective base 3 is fixed to the base frame 1 near the fixed end of the lifting cylinder 102. The telescopic rod 4 includes a first telescopic rod 401 and a second telescopic rod 402. The second telescopic rod 402 is coaxial and slidably disposed inside the first telescopic rod 401. The end of the first telescopic rod 401 away from the second telescopic rod 402 is hinged to the corresponding protective base 3. The end of the second telescopic rod 402 away from the first telescopic rod 401 is hinged to the short side of the transmission plate 107.

[0042] Reference Figure 4 and Figure 5 The first telescopic rod 401 has several slots 403 extending through it, arranged in four rows. The direction of each row of slots 403 is parallel to the length direction of the first telescopic rod 401. The second telescopic rod 402, inserted into the end edge of the first telescopic rod 401, has several elastic pieces 404 fixed thereon, the number of which is the same as the number of rows of slots 403. The length direction of each elastic piece 404 is parallel to the length direction of the second telescopic rod 402. Each end of each elastic piece 404 away from the second telescopic rod 402 has a fixed insertion block 405. Each insertion block 405 can be inserted into any slot 403 in its corresponding row. Simultaneously, each insertion block 405 has an arc-shaped guide surface 406 facing the side wall of the second telescopic rod 402, which abuts against the inner wall of the slot 403 facing the second telescopic rod 402. When the first telescopic rod 401 and the second telescopic rod 402 slide and extend relative to each other, the elastic plate 404 can retract into the second telescopic rod 402 under the pressure of the guide surface 406, so that the insert 405 can disengage from the slot 403 in its original position, and the insert 405 can be inserted into the next slot 403 when it moves to the next slot 403 position, so that the telescopic rod 4 can extend synchronously with the lifting arm 106 as it rises, and the first telescopic rod 401 and the second telescopic rod 402 can be automatically locked in multiple positions in their extension direction.

[0043] Reference Figure 3 and Figure 4A protective platform 407 is provided on the side wall of the first telescopic rod 401 away from the second telescopic rod 402. The protective platform 407 is provided with an unlocking mechanism 5 that enables the insertion block 405 to actively disengage from the slot 403. The unlocking mechanism 5 includes a main rope 6, a winding part 7 for winding one end of the main rope 6, a linkage part 8 for pulling the main rope 6 to move, and a control part 9 for controlling the activation of the linkage part 8.

[0044] Reference Figure 4 and Figure 5 The end of the main rope 6 furthest from the winding section 7 is sequentially inserted into the first telescopic rod 401 and the second telescopic rod 402, with the center lines of the main rope 6 and the second telescopic rod 402 coinciding in their length directions. A traction spring 601 is fixedly connected to the end of the main rope 6 furthest from the winding section 7. The other end of the traction spring 601 is fixedly connected to the inner wall of the end of the second telescopic rod 402 furthest from the first telescopic rod 401, and the extension / retraction direction of the traction spring 601 is parallel to the length direction of the second telescopic rod 402. Several branch ropes 602 are also fixedly connected to the main rope 6 near the insertion block 405. The number of branch ropes 602 is the same as the number of insertion blocks 405, and the free end of each branch rope 602 furthest from the main rope 6 is fixedly connected to the corresponding insertion block 405. In the locked state of the telescopic rod 4, the length direction of each branch rope 602 is perpendicular to the length direction of the main rope 6. At this time, the elastic force of the elastic plate 404 is greater than the tension of the branch rope 602 on the insertion block 405.

[0045] Reference Figure 4 and Figure 6 The winding section 7 includes a winding box 701 fixed to the protective platform 407. The winding box 701 is located on the side of the linkage section 8 away from the second telescopic rod 402. A winding shaft 702 is fixedly installed inside the winding box 701. A winding frame 703 is rotatably connected to the winding shaft 702. A spiral spring 704 is fixedly connected to the inner wall of the winding frame 703. The end of the spiral spring 704 away from the winding frame 703 is fixedly connected to the winding shaft 702. One end of the main rope 6 is fixed and wound around the outer wall of the winding frame 703. The end of the main rope 6 away from the winding frame 703 can pass through the winding box 701.

[0046] Reference Figure 4 and Figure 6 The linkage unit 8 includes a mounting bracket 801 fixed to the winding box 701. The mounting bracket 801 is located on the side wall of the winding box 701 through which the main rope 6 passes. At the same time, the end of the mounting bracket 801 away from the winding box 701 is fixed to the first telescopic rod 401. A first sliding groove 802 is provided on the mounting bracket 801 along the extension direction of the main rope 6. A sliding frame 803 is also slidably connected to the mounting bracket 801. The sliding frame 803 is set in a square frame shape. The top and bottom of the sliding frame 803 are slidably connected to the first sliding groove 802 along the extension direction of the main rope 6. The main rope 6 can pass through the center of the sliding frame 803.

[0047] Reference Figures 6 to 8 The sliding frame 803 has a second sliding groove 804 vertically oriented. Two clamping blocks 805 are also slidably mounted on the sliding frame 803. The length direction of each clamping block 805 is parallel to the plane of the protective platform 407, and the two clamping blocks 805 are located on opposite sides of the main rope 6. The clamping blocks 805 can slide vertically into the second sliding groove 804. Several clamping springs 806 are fixedly connected to the opposite sidewalls of the two clamping blocks 805. The end of each clamping spring 806 away from the clamping block 805 is fixedly connected to the sliding frame 803, and the extension / retraction direction of the clamping springs 806 is parallel to the extension direction of the second sliding groove 804. Arc-shaped grooves 807 are formed on the opposite sidewalls of the clamping blocks 805, and friction patterns are provided on the inner wall of the arc-shaped grooves 807. When the two clamping blocks 805 are clamped, the frictional force of the clamping blocks 805 on the main rope 6 is greater than the tension of the elastic plate 404 on the main rope 6, thus achieving clamping of the main rope 6. At the same time, both ends of the clamping blocks 805 are integrally formed with lugs 808, which are located on the side of the clamping block 805 away from the arc groove 807.

[0048] Reference Figure 7 and Figure 8 A traction frame 809 is fixedly installed on two vertical sidewalls opposite to the winding box 701. The linkage part 8 also includes a linkage rod 810 slidably installed on the traction frame 809. Each linkage rod 810 includes a sliding section 810a and a linkage section 810b. The thickness of the sliding section 810a in the direction of movement of the clamping block 805 is less than the thickness of the linkage section 810b in the direction of movement of the clamping block 805. The sliding section 810a can slide along the extension direction of the main rope 6 and is connected to the traction frame 809. A reset block 811 is fixedly installed on the sliding section 810a. A reset spring 812 is fixedly connected to the reset block 811. The end of the reset spring 812 away from the reset block 811 is fixedly connected to the traction frame 809. The extension direction of the reset spring 812 is parallel to the sliding direction of the linkage section 810b.

[0049] Reference Figure 7 and Figure 8The upper and lower surfaces of the linkage section 810b are both provided with grooves 813, and the inner walls of the grooves 813 facing the sliding section 810a are both provided with arc surfaces 814. Two clamping blocks 805 have two lugs 808 facing the same linkage rod 810, located on the upper and lower sides of the linkage rod 810 respectively, and the two lugs 808 can abut against the corresponding arc surfaces 814. Simultaneously, an abutment block 815 is fixedly connected to the upper and lower surfaces of the linkage section 810b, and the abutment block 815 is located on the side of the groove 813 closer to the sliding section 810a. The side wall of the lug 808 facing the sliding section 810a can abut against the abutment block 815. When the main rope 6 is in the unlocked state, the lug 808 abuts against the abutment block 815; when the main rope 6 is in the locked state, the lug 808 is inserted into the groove 813 and abuts against the inner wall of the groove 813 near the sliding section 810a. In addition, the ends of the sliding section 810a away from the linkage section 810b are all fixedly connected to the traction rope 816.

[0050] Reference Figure 3 , Figure 8 and Figure 9 The control unit 9 includes a control frame 901 fixedly connected to the base frame 1 and a control shaft 902 rotatably connected to the base frame 1. A traction rope 816 is fixed and wound around the control shaft 902, and a control gear 903 is fixedly connected to the end of the control shaft 902 away from the base frame 1. A through slot 904 is provided on the control frame 901, extending perpendicularly to the ground. A pedal 905 passes through and slides through the through slot 904. A control rack 906 is fixedly connected to the end of the pedal 905 facing the base frame 1, extending parallel to the through slot 904. The control rack 906 can slide along the through slot 904 and is connected to the control frame 901. The control rack 906 meshes with the control gear 903. When the operator steps on pedal 905, it can drive pedal 905 and control rack 906 to move simultaneously, thereby driving control gear 903 and control shaft 902 to rotate, realizing the winding and pulling of traction rope 816, which is conducive to activating and starting linkage 8.

[0051] The implementation principle of the support structure for a horizontal jack in this application embodiment is as follows: The working state of the jack can be divided into the following situations:

[0052] One is the lifting state during normal operation. In this state, shaking the lifting handle 105 causes the pump body 104 to contract, thereby filling the lifting cylinder 102 with oil and causing it to extend. This drives the short connecting rod frame 103 to move away from the lifting handle 105, thereby driving the transmission plate 107 to rotate around its axis, realizing the lifting of the lifting arm 106. At this time, the short side of the transmission plate 107 drives the second telescopic rod 402 to move away from the lifting handle 105. At this time, the guide surface 406 abuts against the inner wall of the slot 403, causing the elastic plate 404 to deform, so that the insert 405 disengages from the original position of the slot 403 and moves to the next position of the slot 403 for insertion. This allows the telescopic rod 4 to extend synchronously with the lifting arm 106 as it rises, and the first telescopic rod 401 and the second telescopic rod 402 can be automatically locked in multiple positions in their extension direction.

[0053] Second, a sudden hydraulic system failure may occur during the lifting process. In this case, the lifting cylinder 102 will no longer provide support for the short connecting rod frame 103 and the transmission plate 107. The transmission plate 107 will then tend to descend due to the weight of the supported object. At this time, the insertion block 405 of the second telescopic rod 402 can remain inserted into the slot 403 under the action of the elastic plate 404, thereby keeping the first telescopic rod 401 and the second telescopic rod 402 in a locked state. In this case, the first telescopic rod 401 and the second telescopic rod 402 can provide support for the transmission plate 107, reducing the probability of the supported object suddenly falling and reducing safety hazards.

[0054] The third is the descent state during normal operation or hydraulic system recovery. In this state, the operator steps on pedal 905, driving pedal 905 and control rack 906 to move simultaneously toward the ground, thereby driving control gear 903 and control shaft 902 to rotate, causing the traction rope 816 to be wound and pulled, thus causing linkage rod 810 to slide toward the handle 105. Subsequently, the lug block 808 enters the groove 813 under the action of clamping spring 806. At this time, clamping block 805 can clamp the main rope 6. Linkage rod 810 continues to slide, at which time clamping block 805 abuts against the inner wall of groove 813. Thus, the sliding of linkage rod 810 can drive clamping block 805 and sliding frame 803 to slide together toward handle 105. At this time, clamping block 805 can pull the main rope 6 in the clamped state. After the main rope 6 is pulled, it can pull branch rope 602 and elastic plate 404, thereby causing insert block 405 to disengage from slot 403, and the first telescopic rod 401 and the second telescopic rod 402 to return to the free telescopic state. At this time, turning the return valve 108 causes the lifting cylinder 102 to depressurize and retract, thereby lowering the lifting arm 106 and causing the first telescopic rod 401 and the second telescopic rod 402 to shorten synchronously as the lifting arm 106 descends. After the descent is complete, the operator's feet leave the pedal 905. At this time, the return spring 812 can drive the linkage rod 810, the traction rope 816, the control rack 906, and the pedal 905 to reset. The abutment block 815 can drive the clamping block 805 and the sliding frame 803 to reset, and the insert block 405 will also re-insert into the slot 403 to restore the protective function of the first telescopic rod 401 and the second telescopic rod 402 during lifting.

[0055] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A support structure for a horizontal jack, comprising a base frame (1), a lifting cylinder (102) fixed to the base frame (1), a return valve (108) for depressurizing the lifting cylinder (102), a lifting arm (106) hinged to the base frame (1), and a transmission plate (107) fixed to the lifting arm (106), wherein the transmission plate (107) is connected to the lifting cylinder (102), characterized in that: A protective base (3) is fixed near the fixed end of the lifting cylinder (102) on the base frame (1). A first telescopic rod (401) is hinged to the protective base (3). A second telescopic rod (402) is coaxially and slidably disposed inside the first telescopic rod (401). The end of the second telescopic rod (402) away from the protective base (3) is hinged to the transmission plate (107). Several slots (403) are provided along the length of the first telescopic rod (401). Several elastic plates (404) are fixed to the end of the second telescopic rod (402) inserted into the first telescopic rod (401). An insert (405) is fixed to the outer wall of the free end of the elastic plate (404). The insert (405) can be inserted into the slot (403). Furthermore, the insert (405) has a guide surface (406) on the side facing the transmission plate (107) that can abut against the inner wall of the slot (403); at the same time, the first telescopic rod (401) is also provided with an unlocking mechanism (5) for driving the insert (405) to disengage from the slot (403); the unlocking mechanism (5) includes a main rope (6), a linkage part (8) for pulling the main rope (6) away from the transmission plate (107), and a control part (9) for controlling the activation of the linkage part (8). The main rope (6) is located inside the first telescopic rod (401) and the second telescopic rod (402), and several branch ropes (602) are fixedly connected to the main rope (6). The free ends of the branch ropes (602) are all fixed to the corresponding elastic plates (404). At the end, the elastic force of the elastic sheet (404) is greater than the tension of the support rope (602) on the insert (405); the unlocking mechanism (5) also includes a winding box (701) fixed to the first telescopic rod (401), the winding box (701) is located on the side of the linkage part (8) away from the second telescopic rod (402); a winding shaft (702) is fixed inside the winding box (701), a winding frame (703) is rotatably mounted on the winding shaft (702), and the same spiral spring (704) is fixedly connected between the winding shaft (702) and the winding frame (703); the end of the main rope (6) away from the second telescopic rod (402) is fixed and wound around the outer wall of the winding frame (703); the free end of the main rope (6) can pass through the winding frame (703). The winding box (701) coincides with the center line of the first telescopic rod (401) along its length direction; the linkage part (8) includes a mounting frame (801) fixed to the winding box (701), a sliding frame (803) is slidably disposed on the mounting frame (801) along the length direction of the first telescopic rod (401), and two clamping blocks (805) are slidably disposed on the sliding frame (803), and a clamping spring (806) for pushing the clamping blocks (805) to slide closer to the main rope (6) is fixed on the sliding frame (803); the linkage part (8) also includes a linkage rod (810) slidably disposed on the winding box (701) along the length direction of the main rope (6), and the linkage rod (810) abuts between the two clamping blocks (805);The linkage rod (810) is also provided with a groove (813), and the clamping block (805) can abut against the inner wall of the groove (813) near the second telescopic rod (402) after entering the groove (813). At the same time, the clamping block (805) can abut against the main rope (6) after entering the groove (813). At this time, the frictional force of the clamping block (805) on the main rope (6) is greater than the tension of the elastic plate (404) on the main rope (6). The end of the linkage rod (810) away from the second telescopic rod (402) is fixedly connected to a traction rope (816), and the end of the traction rope (816) away from the linkage rod (810) is connected to the control unit (9). The sliding of the linkage rod (810) can drive the clamping block (805) and the sliding frame (803) to slide together and approach the lifting handle (105).

2. The support structure for a horizontal jack according to claim 1, characterized in that: The main rope (6) is fixed with a traction spring (601) at one end away from the winding box (701), and the other end of the traction spring (601) is fixedly connected to the inner wall of the second telescopic rod (402) away from the first telescopic rod (401).

3. The support structure for a horizontal jack according to claim 1, characterized in that: The control unit (9) includes a control frame (901) fixed to the base frame (1) and a control shaft (902) rotatably mounted on the base frame (1). The traction rope (816) is fixed and wound around the control shaft (902). At the same time, a control gear (903) is fixedly connected to the end of the control shaft (902). A pedal (905) is slidably mounted on the control frame (901) in the vertical direction. A control rack (906) is fixedly connected to the pedal (905). The control rack (906) meshes with the control gear (903).

4. The support structure for a horizontal jack according to claim 1, characterized in that: The clamping blocks (805) have arc-shaped grooves (807) on their opposite sidewalls. The arc-shaped grooves (807) can abut against the main rope (6). The inner wall of the arc-shaped grooves (807) is provided with friction patterns.

5. The support structure for a horizontal jack according to claim 1, characterized in that: The groove (813) has an arc surface (814) on its side wall away from the second telescopic rod (402) to force the two clamping blocks (805) to separate, and the clamping blocks (805) abut against the arc surface (814); and a return spring (812) is fixedly provided on the linkage rod (810) to drive the linkage rod (810) to slide closer to the second telescopic rod (402).

6. The support structure for a horizontal jack according to claim 5, characterized in that: An abutment block (815) is also fixedly installed on the linkage rod (810). The abutment block (815) is located on the side of the arc surface (814) away from the second telescopic rod (402). The clamping block (805) can abut against the abutment block (815).

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