One-way electric drive stopper

Abstract

The invention discloses a one-way electrically-driven stopper, and relates to the technical field of stoppers. The device comprises a rack and an electric driving mechanism, the rack comprises a frame A and a frame B, hollow spaces are formed in the frame A and the frame B and communicate with each other to form a space C, and the electric driving mechanism is installed on the frame A; the connecting rod mechanism comprises first connecting rods and second connecting rods, the at least one first connecting rod and the at least one second connecting rod intersect to form a herringbone shape, and the at least one second connecting rod is indirectly connected with the pulling seat; and the blocking mechanism comprises a blocking sliding block and a blocking head, and the blocking sliding block is connected with the blocking head. According to the tray stopping device, the hinge pin and the hole in the connecting rod mechanism are connected, and the two connecting rods in the connecting rod mechanism are arranged in a relative proportion, so that the tray stopping stability is improved, a complex pneumatic system is replaced, the non-return and stopping functions are integrated, the structure is stable, the noise is low, and the use cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of stoppers, and in particular to a one-way electric drive stopper. Background Art

[0002] The brakes currently used in the market are generally of two types: pneumatic brakes and electric brakes. Pneumatic brakes use a pneumatic system as a power source. The pneumatic system usually includes complex and expensive original units such as air compressors and filters. Regardless of whether the pneumatic brake is working or not, the pneumatic system always remains in working condition. Therefore, the use of pneumatic brakes has a high cost of use and is noisy during the ventilation and deflation process.

[0003] Electric-driven stoppers are generally equipped with damping elements, which can absorb the kinetic energy generated when the pallet moves from high speed to instantaneous stop, so as to achieve the purpose of allowing the pallet to stop smoothly, reduce the impact on the pallet and materials, and reduce noise.

[0004] Chinese invention patent: CN109552866B discloses an electromagnet cam one-way material stopper, which uses an electromagnet, which is also a type of electromagnet that uses electricity as a power source, to replace a complex pneumatic system. Among them, the high position A, low position B and swing block structure in the cam mechanism simplify the overall structure of the stopper, and the in-position hook increases the in-position retention of the stopper, and integrates the non-return and material stopping functions, simplifying the installation time.

[0005] However, the disadvantage of this invention patent is that the dead point of the high position A of the cam mechanism and the high pair of the three-contact pin of the blocking block mechanism is not a stable connection method, but just touches together. When blocking, the verticality of the swing block mechanism in the vertical direction is very high. If the swing block mechanism is slightly offset, the position of the dead point will move forward or backward, which is not enough to provide support for the blocking mechanism above. Therefore, a one-way electric drive stopper is proposed to solve the above problem. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the dead point of the high position A of the cam mechanism and the high pair of the pin shaft of the blocking block mechanism in the electromagnetic cam one-way material stopper of China invention patent: CN109552866B is not stable enough. When blocking, the swing block mechanism is slightly deviated, which is not enough to provide support for the blocking mechanism above. In addition, the use of a pneumatic stopper has a high cost of use and loud noise during the ventilation and deflation process. The present invention provides a one-way electric drive stopper.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] A one-way electric stopper comprises a frame and an electric drive mechanism, wherein the frame comprises an A frame and a B frame, and both the A frame and the B frame have hollowed-out spaces inside, and are connected together to form a C space, and the electric drive mechanism is installed on the A frame; a connecting rod mechanism and a pulling seat, wherein the connecting rod mechanism comprises a first connecting rod and a second connecting rod, and at least one first connecting rod and at least one second connecting rod intersect in a herringbone shape, and at least one second connecting rod is indirectly connected to the pulling seat; a blocking mechanism, wherein the blocking mechanism comprises a blocking slider and a blocking head, wherein the blocking slider is connected to the blocking head, and the blocking slider drives the blocking head to slide in the direction of the X-axis, and the blocking mechanism, the connecting rod mechanism and the pulling seat are all installed in the C space.

[0009] Further, at least one first link and at least one second link are connected by a second hinge pin, and a length ratio between the first link and the second link is (2.5-3):(3.5-4).

[0010] Furthermore, the connecting rod mechanism also includes a first hinge pin, several second hinge pins and a third hinge pin, at least one first connecting rod is connected to the A frame through the first hinge pin, at least one first connecting rod and at least one second connecting rod are connected through the second hinge pin, at least one second connecting rod is connected to the pulling seat through the third hinge pin, one end of at least one first connecting rod rotates around the first hinge pin as the center of the circle, and the other end rotates around one of the second hinge pins as the center of the circle, one end of at least one second connecting rod rotates around the third hinge pin as the center of the circle, and the other end rotates around one of the second hinge pins as the center of the circle.

[0011] Furthermore, the blocking mechanism also includes a sliding pin and a translation seat, the sliding pin and the translation seat are fixedly connected, the pulling seat is provided with a plurality of through holes and a plurality of translation slots, the sliding pin passes through at least one through hole and slides in at least one through hole in the X-axis direction, the translation seat slides in at least one translation slot, and a damper is installed on the translation seat.

[0012] Furthermore, a non-return mechanism is included, which includes a non-return block, a torsion spring and a non-return hinge pin, and the non-return block is installed on the B frame through the non-return hinge pin.

[0013] Furthermore, it also includes a locking mechanism, which includes a locking hook and a first pin. The locking hook is connected to the pulling seat, and the first pin is connected to the translation seat. One end of the locking hook is provided with a notch, and the inner wall of the notch abuts against the surface of the first pin.

[0014] Furthermore, the locking mechanism also includes a locking hinge pin and a locking stop pin. The locking hook is installed on the pulling seat through the locking hinge pin. The locking hook rotates with the locking hinge pin as the center of the circle. The locking stop pin is installed on the B frame. The locking stop pin prevents the locking hook from continuing to press against the first pin under the influence of gravity.

[0015] Furthermore, the locking mechanism also includes a second pin and a magnetic switch, wherein the magnetic switch is mounted on the B frame, and the second pin is connected to the translation seat. When the blocking slider slides against the inner wall of the pulling seat, the magnetic switch senses that the second pin is in place.

[0016] Furthermore, a release unlocking rod is installed on the A frame, and the release unlocking rod is against the surface of the first connecting rod, and the release unlocking rod translates in the direction of the Y axis.

[0017] Furthermore, a base is installed on one side of the A frame, the electric drive mechanism is connected to the push rod, and one end of the push rod away from the electric drive mechanism is connected to a connecting cross bar, and the connecting cross bar is installed on the first connecting rod.

[0018] The beneficial effects of the present invention are as follows: the present invention is connected through the hinge pin and the hole in the connecting rod mechanism, and the two connecting rods in the connecting rod mechanism are set in relative proportion, which improves the stability when stopping the pallet, replaces the complex pneumatic system, and integrates the check and stop functions, has a stable structure, low noise, and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 This invention Figure 1 Schematic diagram of the structure of the blocking slider;

[0021] Figure 3 This invention Figure 1 Schematic diagram of the structure of the abort block;

[0022] Figure 4 It is a front view schematic diagram of the interior of the present invention;

[0023] Figure 5 It is a schematic cross-sectional view of the present invention;

[0024] Figure 6 It is a schematic diagram of the standby state of the present invention;

[0025] Figure 7 is a schematic diagram of the three-dimensional structure of another embodiment of the present invention;

[0026] Figure 8 It is a schematic top view of another embodiment of the present invention.

[0027] Figure markings: 1. Frame; 2. Electric drive mechanism; 21. Push rod; 22. Connecting cross bar; 3. Connecting rod mechanism; 31. First connecting rod; 32. Second connecting rod; 33. First hinge pin; 34. Second hinge pin; 35. Third hinge pin; 4. Pulling seat; 5. Blocking mechanism; 51. Blocking slider; 52. Blocking head; 53. Sliding pin; 54. Translation seat; 6. Check mechanism; 61. Check block; 62. Check hinge pin; 63. Torsion spring; 7. Locking mechanism; 71. Locking hook; 72. First pin; 73. Second pin; 74. Locking hinge pin; 75. Locking stop pin; 8. Release unlocking lever; 9. Damper; 101. Base. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] A one-way electric stopper includes a frame 1 and an electric drive mechanism 2, the frame 1 includes an A frame and a B frame, the interiors of the A frame and the B frame are hollowed out, and are connected together to form a C space, and the electric drive mechanism 2 is installed on the A frame; a connecting rod mechanism 3 and a pulling seat 4, the connecting rod mechanism 3 includes a first connecting rod 31 and a second connecting rod 32, at least one first connecting rod 31 and at least one second connecting rod 32 intersect in a herringbone shape, and at least one second connecting rod 32 is indirectly connected to the pulling seat 4; a blocking mechanism 5, the blocking mechanism 5 includes a blocking slider 51 and a blocking head 52, the blocking slider 51 is connected to the blocking head 52, and the blocking slider 51 drives the blocking head 52 to slide in the direction of the X-axis, and the blocking mechanism 5, the connecting rod mechanism 3 and the pulling seat 4 are all installed in the C space.

[0033] like Figure 2 As shown, at least one first link 31 and at least one second link 32 are connected by a second hinge pin 34 , and a length ratio between the first link 31 and the second link 32 is (2.5-3):(3.5-4).

[0034] like Figure 2 As shown, the connecting rod mechanism 3 also includes a first hinge pin 33, several second hinge pins 34 and a third hinge pin 35. At least one first connecting rod 31 is connected to the A frame through the first hinge pin 33, at least one first connecting rod 31 and at least one second connecting rod 32 are connected through the second hinge pin 34, and at least one second connecting rod 32 is connected to the pulling seat 4 through the third hinge pin 35. One end of at least one first connecting rod 31 rotates around the first hinge pin 33 as the center of the circle, and the other end rotates around one of the second hinge pins 34 as the center of the circle. One end of at least one second connecting rod 32 rotates around the third hinge pin 35 as the center of the circle, and the other end rotates around one of the second hinge pins 34 as the center of the circle.

[0035] like Figure 1 As shown, the blocking mechanism 5 also includes a sliding pin 53 and a translation seat 54, which are fixedly connected. The pulling seat 4 is provided with a plurality of through holes and a plurality of translation slots. The sliding pin 53 passes through at least one through hole and slides in at least one through hole in the X-axis direction. The translation seat 54 slides in at least one translation slot. A damper 9 is installed on the translation seat 54. The blocking head 52 is hit, driving the blocking slider 51, the sliding pin 53 and the translation seat 54 to slide, and at the same time compressing the damper 9 to absorb the kinetic energy generated by the tray from movement to stop. When the stroke of the damper 9 is close to the entire stroke, the kinetic energy of the tray is just completely absorbed by the damper 9, so that the tray stops at the specified precise position.

[0036] like Figure 3As shown, it further includes a check mechanism 6. The check mechanism 6 includes a check block 61, a torsion spring 63, and a check hinge pin 62. The check block 61 is installed on the B-frame through the check hinge pin 62. When the check block 61 is not forced downward, the resilience of the torsion spring 63 causes one end of the check block 61 to tilt up to block the reverse movement of the tray. The reason for the reverse movement is that when the damping force of the damper 9 is adjusted inappropriately, the force of the damper 9 will rebound, or after long-term use, the damper 9 becomes fatigued or fails and is prone to rebound.

[0037] As Figure 4 shown, it further includes a locking mechanism 7. The locking mechanism 7 includes a locking hook 71 and a first pin 72. The locking hook 71 is connected to the pulling seat 4, and the first pin 72 is connected to the translation seat 54. One end of the locking hook 71 has a notch, and the inner wall of the notch abuts against the surface of the first pin 72. The locking hook 71 is J-shaped or 丨-shaped. When the pulling seat 4 is hit by the tray and reaches the position, during the stop and before release, the first pin 72 abuts against the locking hook 71 to hold the pulling seat 4 so that it cannot automatically return to its original position. This is applied in the case where the tray needs to be lifted.

[0038] As Figure 2 、 Figure 4 shown, the locking mechanism 7 further includes a locking hinge pin 74 and a locking stop pin 75. The locking hook 71 is installed on the pulling seat 4 through the locking hinge pin 74. The locking hook 71 rotates around the locking hinge pin 74. The locking stop pin 75 is installed on the B-frame, and the locking stop pin 75 blocks the locking hook 71 from continuing to abut against the first pin 72 under the influence of gravity.

[0039] As Figure 1 、 Figure 4 shown, the locking mechanism 7 further includes a second pin 73 and a magnetic switch. The magnetic switch (not labeled) is installed on the B-frame. The second pin 73 is connected to the translation seat 54. When the blocking slider 51 slides to abut against the inner wall of the pulling seat 4, the magnetic switch senses that the position of the second pin 73 is in place.

[0040] As Figure 4 shown, a release unlocking rod 8 is installed on the A-frame. The release unlocking rod 8 abuts against the surface of the first connecting rod 31. The release unlocking rod 8 translates in the direction of the Y-axis. The release unlocking rod 8 holds the first connecting rod 31 so that after the second connecting rod 32 is pulled to the displaced position by the second hinge pin 34, it remains in the displaced position, keeping the blocking head 52 in a state of not abutting against the tray. When the roller path and the stopper are not powered on, it is convenient to move the tray to debug other equipment or workstations.

[0041] As Figure 5 、 Figure 7As shown, a base 101 is installed on one side of the A frame, the electric drive mechanism 2 is connected to the push rod 21, and the end of the push rod 21 away from the electric drive mechanism 2 is connected to the connecting cross bar 22, which is installed on the first connecting rod 31.

[0042] Example: The entire workflow of this organization can be divided into the following five states in order:

[0043] 1. Standby state; 2. Stop state; 3. Release state; 4. Reset state; 5. Forced release state.

[0044] The following are five working states:

[0045] 1. Standby state: When the stopper is in standby state, Figure 6 As shown, at this time, the electric drive mechanism 2 loses power and retracts, the first connecting rod 31 and the second connecting rod 32 of the connecting rod mechanism 3 are in a vertical state and maintained in the same straight line, the pulling seat 4 is in a horizontal position and perpendicular to the support position of the second connecting rod 32, the blocking slider 51 is in a standby retracted state, the check block 61 in the check mechanism 6 is in a free end raised state, the locking hook 71 is in a free horizontal state under the action of gravity, and the piston rod of the damper 9 is in a free extended state.

[0046] 2. Stop state: When the collision block of the tray hits the blocking head 52, it is in the stop state, such as Figure 2 As shown, at this time, the electric drive mechanism 2 loses power and retracts, the first link 31 and the second link 32 of the connecting rod mechanism 3 are in a vertical state, the pulling seat 4 is in a horizontal state and perpendicular to the supporting position of the second link 32, the blocking slide 51 is in an extended state where it is hit into place, and the non-return mechanism 6 is pressed down by the tray block and is in a free lifting state again to prevent the tray from moving in the opposite direction. When the blocking slide 51 is in the extended state, it drives the first pin 72 and the second pin 73 to move horizontally in the direction away from the locking hook 71, and the locking hook 71 falls freely under the action of gravity and hooks the first pin 72; in addition, the working There may be other actions after the position is stopped, namely: when the pallet needs to be lifted in the work station, the pallet collision block disengages from the blocking head 52, and the locking hook 71 hooks the first pin 72, so that the blocking slider 51 and the blocking head 52 are locked in this state, and will not rebound back to the standby state under the reaction of the damper 9 after being compressed due to the disengagement of the pallet collision block. When the pallet needs to fall in the work station, the blocking head 52 is still in the blocking position, and the blocking head 52 is still in the blocking position, leaving space for the pallet collision block to fall back, avoiding interference and causing the pallet to overturn, and the piston rod of the damper 9 is in the compressed position.

[0047] 3. Release status: When the pallet hits the block and needs to be released, it is in the release status, such as Figure 4 、 Figure 5As shown, at this time, the electric drive mechanism 2 is energized to extend the push rod 21, and the push rod 21 pushes the connecting cross bar 22, so that the first connecting rod 31 rotates a certain angle with the first hinge pin 33 as the center, and the angle range is 10-45 degrees, so that the first connecting rod 31 and the second connecting rod 32 are in a sideways herringbone shape, and at the same time, the pulling force is transmitted to the pulling seat 4 through the third hinge pin 35, so that the pulling seat 4 descends under the action of the pulling force, allowing the blocking slider 51 and the blocking head 52 to descend, and at the same time the height of the non-return mechanism 6 also decreases, and the highest point of the non-return block 61 is lower than the lower surface of the tray collision block. At this time, the tray collision block is released and can continue to move forward.

[0048] 4. Reset state: When the pallet collision block needs to be hit in the next cycle, it is in the reset state, such as Figure 6 As shown, at this time, the electric drive mechanism 2 loses power; the torsion spring 63 has a retraction force, causing one end of the check block 61 to freely tilt up, and the push rod 21 pulls back the connecting cross bar 22, driving the first connecting rod 31 and the second connecting rod 32 to return to a vertical state, which is at the dead point position. At the same time, the force is transmitted to the pulling seat 4 through the third hinge pin 35, so that the pulling seat 4 returns to a horizontal standby state; to prepare for the next impact cycle.

[0049] At the same time, the locking hook 71 disengages from the first pin 72 under the action of the locking pin 75, unlocking the blocking slider 51, the blocking head 52 and the non-return mechanism 6. Thereafter, the blocking slider 51, the blocking head 52, the sliding pin 53 and the translation seat 54 automatically retract to the standby position under the reaction after the damper 9 is compressed, and the piston rod of the damper 9 extends to prepare for the next impact cycle.

[0050] 5. Forced release state: When the roller conveyor and the stopper are not powered on, it is convenient to move the pallet and debug other equipment or workstations, such as Figure 4 As shown, when the release unlocking rod 8 is not inserted into one side of the first link 31, it is a demonstration of a free release state. When the release unlocking rod 8 is forcibly inserted into one side of the first link 31 and abuts against the surface of the first link 31, the position of the first link 31 is fixed, so that the first link 31, the second link 32, the third hinge pin 35, the pulling seat 4 and the torsion spring 63 cannot be reset, and they are always in the release state. At this time, the pallet can move smoothly on the roller conveyor.

[0051] Another embodiment, such as Figure 7 、 Figure 8 As shown, it is a light-load stopper with a stop weight range of 80kg-300kg, while the stop weight range of the previous embodiment is 300kg-600kg. The structural parts in this embodiment are basically the same, but the shape of the base 101 is different. The shape of this base 101 is butterfly-shaped or I-shaped, and there are holes at the four corners for installation and fixation.

[0052] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments and that various modifications and improvements are possible without departing from the spirit and scope of the present invention. Such modifications and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-way electric drive stop device, characterized by: include A frame (1) and an electric drive mechanism (2), wherein the frame (1) comprises an A frame and a B frame, wherein the A frame and the B frame both have hollowed-out spaces inside and are connected together to form a C space, and the electric drive mechanism (2) is mounted on the A frame; A connecting rod mechanism (3) and a pulling seat (4), wherein the connecting rod mechanism (3) comprises a first connecting rod (31) and a second connecting rod (32), at least one first connecting rod (31) and at least one second connecting rod (32) intersect to form a herringbone shape, and at least one second connecting rod (32) is indirectly connected to the pulling seat (4); A blocking mechanism (5) includes a blocking slider (51) and a blocking head (52), wherein the blocking slider (51) is connected to the blocking head (52), and the blocking slider (51) drives the blocking head (52) to slide in the direction of the X axis. The blocking mechanism (5), the connecting rod mechanism (3) and the pulling seat (4) are all installed in the C space.

2. The one-way electric drive stop device according to claim 1, characterized in that: At least one first link (31) and at least one second link (32) are connected via a second hinge pin (34), and a length ratio between the first link (31) and the second link (32) is (2.5-3):(3.5-4).

3. The one-way electric drive stop device according to claim 1, characterized in that: The connecting rod mechanism (3) further comprises a first hinge pin (33), a plurality of second hinge pins (34) and a third hinge pin (35); at least one first connecting rod (31) is connected to the A frame via the first hinge pin (33); at least one first connecting rod (31) and at least one second connecting rod (32) are connected via the second hinge pin (34); at least one second connecting rod (32) is connected to the pulling seat (4) via the third hinge pin (35); one end of at least one first connecting rod (31) rotates around the first hinge pin (33) as a circle center, and the other end rotates around one of the second hinge pins (34) as a circle center; one end of at least one second connecting rod (32) rotates around the third hinge pin (35) as a circle center, and the other end rotates around one of the second hinge pins (34) as a circle center.

4. The one-way electric drive stop device according to claim 1, characterized in that: The blocking mechanism (5) further comprises a sliding pin (53) and a translation seat (54), wherein the sliding pin (53) and the translation seat (54) are fixedly connected, and the pulling seat (4) is provided with a plurality of through holes and a plurality of translation slots, wherein the sliding pin (53) passes through at least one through hole and slides in at least one through hole in the X-axis direction, and the translation seat (54) slides in at least one translation slot, and a damper (9) is mounted on the translation seat (54).

5. The one-way electric drive stop device according to claim 1, characterized in that: The invention also includes a non-return mechanism (6), wherein the non-return mechanism (6) includes a non-return block (61), a torsion spring (63) and a non-return hinge pin (62), and the non-return block (61) is installed on the B frame through the non-return hinge pin (62).

6. The one-way electric drive stop device according to claim 1, characterized in that: The invention also includes a locking mechanism (7), wherein the locking mechanism (7) includes a locking hook (71) and a first pin (72), wherein the locking hook (71) is connected to the pulling seat (4), and the first pin (72) is connected to the translation seat (54), and a notch is provided at one end of the locking hook (71), and the inner wall of the notch abuts against the surface of the first pin (72).

7. The one-way electric drive stop device according to claim 6, characterized in that: The locking mechanism (7) further comprises a locking hinge pin (74) and a locking stop pin (75); the locking hook (71) is mounted on the pulling seat (4) via the locking hinge pin (74); the locking hook (71) rotates with the locking hinge pin (74) as the center of a circle; the locking stop pin (75) is mounted on the B frame; the locking stop pin (75) prevents the locking hook (71) from continuing to press against the first pin (72) under the influence of gravity.

8. The one-way electric drive stop device according to claim 6, characterized in that: The locking mechanism (7) further comprises a second pin (73) and a magnetic switch, wherein the magnetic switch is mounted on the B frame, and the second pin (73) is connected to the translation seat (54). When the blocking slider (51) slides to abut against the inner wall of the pulling seat (4), the magnetic switch senses that the second pin (73) is in place.

9. The one-way electric drive stop device according to claim 1, characterized in that: A release unlocking rod (8) is installed on the A frame, and the release unlocking rod (8) is against the surface of the first connecting rod (31), and the release unlocking rod (8) moves in the direction of the Y axis.

10. The one-way electric stopper according to claim 1, characterized in that: A base (101) is installed on one side of the A frame, the electric drive mechanism (2) is connected to a push rod (21), an end of the push rod (21) away from the electric drive mechanism (2) is connected to a connecting cross bar (22), and the connecting cross bar (22) is installed on a first connecting rod (31).

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