Electronic part continuous detection equipment capable of automatically distributing materials

Abstract

The utility model discloses an electronic part continuous detection device capable of automatic material distribution, which belongs to the field of electronic part processing, and comprises a limiting table, a conveyor belt is movably mounted at the upper end in the limiting table, a plurality of mounting holes which are transversely distributed in an array are formed in the conveyor belt, and the mounting holes are arranged in the limiting table. The first bearings are fixedly embedded in the front end and the rear end of the inner side of the mounting hole, the limiting cylinder is fixedly mounted in the first bearing at the front end, and the rotating rod is fixedly mounted in the first bearing at the rear end, so that a plurality of electronic parts needing to be detected can be conveyed by arranging the limiting table and the conveying belt, and detection is completed in the conveying process; and qualified and unqualified electronic parts are respectively placed in different storage frames for sub-packaging according to detection results, the detection equipment can realize continuous detection and automatic material distribution of the electronic parts, and the detection efficiency of the electronic parts and the practicability of the detection equipment are effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic parts processing, and more specifically to an electronic parts continuous detection device capable of automatically dividing materials. Background Art

[0002] After the electronic component equipment is produced, it needs to undergo comprehensive testing and various current and voltage tests. Traditionally, due to the large variety of electronic components, there has been some progress in the development and promotion of universal test fixtures, which rely on manual operation and subjective visual inspection of instrument test results for selection.

[0003] China Patent Authorization Announcement No.: CN217359964U, provides a device for detecting the surface of electronic parts. This patent sets a fixing mechanism and a position adjustment seat. When in use, when different types of electronic components are powered on for detection, the electronic component circuit board is placed inside the two fixing grooves, and the second latching tooth is driven upward by pulling the pull rod, so that the second latching tooth falls off and contacts the first latching tooth. At this time, the position adjustment seat is pushed to drive the fixing frame to slide, and the electronic component circuit board is fixed, which is convenient for detecting the circuit conductivity of electronic component circuit boards of different types and sizes, and enhances practicality and versatility.

[0004] When the above detection device is in use, manual loading and unloading is required, which results in a slow detection speed of the electronic component circuit board and is not suitable for mass production of the electronic component circuit board. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide an electronic parts continuous inspection device with automatic material sorting, which can realize the transportation of multiple electronic parts that need to be inspected by setting a limit table and a conveyor belt, complete the inspection during the transportation process, and place qualified and unqualified electronic parts in different storage frames for packaging according to the inspection results. The inspection device can realize continuous inspection and automatic material sorting of electronic parts, effectively improving the inspection efficiency of electronic parts and the practicability of the inspection equipment.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A continuous inspection device for electronic parts that can automatically divide materials comprises a limit table, a conveyor belt is movably installed on the upper end of the limit table, a plurality of mounting holes arranged in a transverse array are arranged inside the conveyor belt, first bearings are fixedly embedded in the front and rear ends of the inner sides of the mounting holes, a limit cylinder is fixedly installed inside the first bearing at the front end, a rotating rod is fixedly installed inside the first bearing at the rear end, a detection limit frame is fixedly installed inside the rotating rod and the limit cylinder, the detection limit frame is located in the mounting hole, electronic parts are clamped and installed inside the detection limit frame, a detection frame is fixedly installed in the middle of the upper end of the limit table, a first electric push rod is fixedly installed in the middle of the upper end of the detection frame, an output shaft is arranged at the lower end of the first electric push rod, a detection plate is fixedly installed at the lower end of the output shaft, and a control panel is fixedly installed at the front end of the detection frame.

[0010] Furthermore, a plurality of the detection limit frames are provided with a storage groove at the rear end, an elastic clamping assembly is fixedly installed inside the storage groove, the elastic clamping assembly comprises a telescopic rod, a spring and a clamping frame, the telescopic rod is installed at the rear end of the storage groove by a fixed connection method, the spring is wound around the outside of the telescopic rod, the clamping frame is installed at the front end of the telescopic rod by a fixed connection method, the clamping frame is adapted to the shape of the storage groove, a limit groove is provided at the front end of the detection limit frame, a card slot is provided at the front end of the plurality of the clamping frames, a first magnetic block is fixedly embedded at the rear end of the clamping frame, and a plurality of the electronic parts are clamped in the limit groove and the card slot.

[0011] Furthermore, two transversely arranged feeding holes are provided in the middle of the lower end of the limit platform, and the feeding holes are respectively located below and to the lower right of the detection frame; two first electromagnets are fixedly embedded in the middle of the rear end of the limit platform, and the first electromagnets are respectively located behind the two feeding holes; the first electromagnets are magnetically connected to the first magnetic block; and two transversely arranged storage frames are placed in the middle of the lower end of the limit platform, and the storage frames are respectively located below the two feeding holes.

[0012] Furthermore, a movable rod is slidably installed at the rear end of each of the limit cylinders, a second magnetic block is fixedly embedded at one end of the movable rod away from the detection limit frame, sliding grooves are provided on both sides of each of the limit cylinders, and a clamping block is fixedly installed at the rear end of each side of each of the movable rods, and the clamping block is clamped in the sliding groove.

[0013] Furthermore, a flip assembly is fixedly installed in the middle of the front end of the limit platform, and the flip assembly includes a second bearing and a rotating shaft. The second bearing is installed in the middle of the front end of the limit platform by a fixed embedding method, and the rotating shaft is installed inside the second bearing by a fixed connection method. A slot is provided in the middle of the rear end of the rotating shaft, and a second electromagnet is fixedly embedded in the rear end of the rotating shaft, and the second electromagnet is magnetically connected to the second magnetic block.

[0014] Furthermore, the flipping assembly also includes a gear, a second electric push rod and a rack. A gear is fixedly installed at the front end of the rotating shaft. The second electric push rod is installed at the middle part of the front end of the limit platform by a fixed connection. An output shaft is arranged on the left side of the second electric push rod. The rack is installed on the left side of the output shaft by a fixed connection. The rack is located at the lower end of the gear, and the rack is meshed with the gear.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) This solution can realize the transportation of multiple electronic parts that need to be inspected by setting up a limit table and a conveyor belt, completing the inspection during the transportation process, and placing qualified and unqualified electronic parts in different storage boxes for packaging based on the inspection results. The inspection equipment can realize continuous inspection and automatic material sorting of electronic parts, effectively improving the inspection efficiency of electronic parts and the practicality of the inspection equipment.

[0018] (2) The staff can manually insert the front end of the electronic component into the limit slot, then squeeze the clamping frame backwards, clip the rear end of the electronic component into the slot at the front end of the clamping frame, and then release the clamping frame. The spring automatically extends and pushes the clamping frame forward to clamp and fix the electronic component.

[0019] (3) After the inspection board moves down to inspect the electronic parts, if the inspection is qualified, the inspection board sends a signal to the control panel, which electrically connects the first electromagnet on the left side of the control panel to energize the first electromagnet and the first magnetic block at the rear end of the electronic parts, so that the clamping frame moves backward, and the electronic parts automatically fall downward and are collected in the left storage frame; if the inspection is unqualified, the control panel electrically connects the first electromagnet on the right side to energize the conveyor belt, and when the electronic parts move to the front of the first electromagnet on the right side, the first electromagnet and the first magnetic block at the rear end of the electronic parts are attracted to the clamping frame, so that the clamping frame moves backward, and the electronic parts automatically fall downward and are collected in the right storage frame.

[0020] (4) When the electronic parts are moved to the bottom of the detection frame for detection, the positions of the rotating shaft and the limiting cylinder correspond to each other front and back, and the second electromagnet is connected to the power supply so that the second electromagnet is magnetically attracted to the second magnetic block, and then the movable rod is moved from the limiting cylinder and inserted into the slot at the rear end of the rotating shaft, so that the movable rod is magnetically connected to the rotating shaft.

[0021] (5) After the upper end surface of the electronic component is inspected, the control panel can immediately energize the second electromagnet and the second electric push rod, so that the movable rod is connected to the rotating shaft, and the second electric push rod drives the rack to extend to the left. At the same time, the rack drives the gear to flip 180 degrees, thereby synchronously driving the detection limit frame and the electronic component to flip, so that the detection board can detect the other side of the electronic component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the electronic parts continuous detection equipment in the utility model;

[0023] Figure 2 It is a cross-sectional view of the limiting platform in the utility model;

[0024] Figure 3 It is a cross-sectional view of the detection limit frame in the utility model;

[0025] Figure 4 For the utility model Figure 1 Enlarged view of point A in the middle;

[0026] Figure 5 For the utility model Figure 1 Enlarged view of point B in the middle.

[0027] Description of the numbers in the figure:

[0028] 1. Limiting table; 101. Feeding hole; 102. First electromagnet; 2. Conveyor belt; 21. Mounting hole; 22. First bearing; 3. Detection limiting frame; 31. Storage slot; 32. Limiting slot; 33. Elastic clamping assembly; 331. Telescopic rod; 332. Spring; 333. Clamping frame; 3331. Card slot; 3332. First magnetic block; 34. Rotating rod; 35. Limiting cylinder; 351. Movable rod; 352. Second magnetic block; 4. Electronic parts; 5. Detection frame; 6. First electric push rod; 7. Detection board; 8. Control panel; 9. Flip assembly; 91. Second bearing; 92. Rotating shaft; 921. Slot; 922. Second electromagnet; 93. Gear; 94. Second electric push rod; 95. Rack; 10. Storage frame. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] See also Figure 1-5 , an electronic parts continuous detection equipment with automatic material sorting includes a limit platform 1, a conveyor belt 2 is movably installed on the upper end of the limit platform 1, a plurality of mounting holes 21 arranged in a transverse array are arranged inside the conveyor belt 2, a first bearing 22 is fixedly embedded at the front and rear ends of the inner side of the mounting hole 21, a limit cylinder 35 is fixedly installed inside the front first bearing 22, a rotating rod 34 is fixedly installed inside the rear first bearing 22, a detection limit frame 3 is fixedly installed inside the rotating rod 34 and the limit cylinder 35, the detection limit frame 3 is located in the mounting hole 21, an electronic part 4 is clamped and installed inside the detection limit frame 3, a detection frame 5 is fixedly installed in the middle of the upper end of the limit platform 1, a first electric push rod 6 is fixedly installed in the middle of the upper end of the detection frame 5, an output shaft is arranged at the lower end of the first electric push rod 6, a detection plate 7 is fixedly installed at the lower end of the output shaft, and a control panel 8 is fixedly installed at the front end of the detection frame 5. A plurality of electronic components 4 are fixed in the detection limit frame 3, and the conveyor belt 2 is started, so that the conveyor belt 2 drives the plurality of electronic components 4 to move horizontally from left to right. When the electronic components 4 move to the lower end of the detection frame 5, the first electric push rod 6 is started to move downward to automatically detect the electronic components 4. The conveyor belt 2 is an existing technology well known to those skilled in the art, and its specific structure, connection relationship and functional principle are not repeated here.

[0034] See also Figure 3, a plurality of detection limit frames 3 are provided with a storage groove 31 at the rear end, and an elastic clamping assembly 33 is fixedly installed inside the storage groove 31. The elastic clamping assembly 33 includes a telescopic rod 331, a spring 332 and a clamping frame 333. The telescopic rod 331 is installed at the rear end of the storage groove 31 by a fixed connection method, and the spring 332 is wound around the outside of the telescopic rod 331. The clamping frame 333 is installed at the front end of the telescopic rod 331 by a fixed connection method. The clamping frame 333 is adapted to the shape of the storage groove 31. The detection limit frame 3 is provided with a limit groove 32 at the front end, and a plurality of clamping A card slot 3331 is provided at the front end of the holding frame 333, and a first magnetic block 3332 is fixedly embedded at the rear end of the clamping frame 333. Multiple electronic parts 4 are clamped in the limiting slot 32 and the card slot 3331. When in use, the staff can manually insert the front end of the electronic part 4 into the limiting slot 32, and then squeeze the clamping frame 333 backwards, and clamp the rear end of the electronic part 4 into the card slot 3331 at the front end of the clamping frame 333, and then release the clamping frame 333, the spring 332 automatically extends, and the spring 332 pushes the clamping frame 333 to move forward to clamp and fix the electronic part 4.

[0035] See also Figure 1-2 Two horizontally arranged feeding holes 101 are arranged in the middle of the lower end of the limit platform 1. The feeding holes 101 are respectively located below and to the lower right of the detection frame 5. Two first electromagnets 102 are fixedly embedded in the middle of the rear end of the limit platform 1. The first electromagnets 102 are respectively located behind the two feeding holes 101. The first electromagnets 102 are magnetically connected to the first magnetic block 3332. Two horizontally arranged storage frames 10 are placed in the middle of the lower end of the limit platform 1. The storage frames 10 are respectively located below the two feeding holes 101. When in use, after the detection board 7 moves down to detect the electronic parts 4, if the detection is qualified, the detection board 7 sends a signal to the control panel 8, and the control panel 8 electrically connects the first electromagnet 102 on the left side to be energized, so that the first electromagnet 102 is magnetically attracted to the first magnetic block 3332 at the rear end of the electronic component 4, and the clamping frame 333 moves backward, and the electronic component 4 automatically falls downward and is collected in the left storage frame 10; in the case of unqualified detection, the control panel 8 electrically connects the first electromagnet 102 on the right side to be energized, and the conveyor belt 2 continues to move. When the electronic component 4 moves to the front of the first electromagnet 102 on the right side, the first electromagnet 102 is magnetically attracted to the first magnetic block 3332 at the rear end of the electronic component 4, and the clamping frame 333 moves backward, and the electronic component 4 automatically falls downward and is collected in the right storage frame 10.

[0036] See also Figure 2 and Figure 5 A movable rod 351 is slidably installed at the rear end of each of the plurality of limit cylinders 35, and a second magnetic block 352 is fixedly embedded at one end of the movable rod 351 away from the detection limit frame 3. When in use, when the conveyor belt 2 moves, the movable rod 351 is stored in the limit cylinder 35 by default, and will not interfere with the use of the conveyor belt 2.

[0037] A flip assembly 9 is fixedly installed in the middle of the front end of the limit platform 1, and the flip assembly 9 includes a second bearing 91 and a rotating shaft 92. The second bearing 91 is installed in the middle of the front end of the limit platform 1 by a fixed embedding method, and the rotating shaft 92 is installed inside the second bearing 91 by a fixed connection method. A slot 921 is provided in the middle of the rear end of the rotating shaft 92, and a second electromagnet 922 is fixedly embedded in the rear end of the rotating shaft 92. The second electromagnet 922 is magnetically connected to the second magnetic block 352. When in use, when the electronic component 4 is moved to the bottom of the detection frame 5 for detection, the positions of the rotating shaft 92 and the limit cylinder 35 correspond front to back. The second electromagnet 922 is connected to a power supply so that the second electromagnet 922 is magnetically attracted to the second magnetic block 352, and then the movable rod 351 is moved from the limit cylinder 35 and inserted into the slot 921 at the rear end of the rotating shaft 92, so that the movable rod 351 is magnetically connected to the rotating shaft 92.

[0038] Slide grooves are provided on both sides of the plurality of limit cylinders 35, and blocks are fixedly installed on the rear ends of both sides of the plurality of movable rods 351, which are clamped in the slide grooves. When in use, the movable rod 351 can be connected to the limit cylinder 35 through the setting of the block and the slide groove, so that the movable rod 351 can be translated back and forth in the limit cylinder 35.

[0039] The flip assembly 9 also includes a gear 93, a second electric push rod 94 and a rack 95. The gear 93 is fixedly installed at the front end of the rotating shaft 92, and the second electric push rod 94 is installed in the middle of the front end of the limit platform 1 by a fixed connection method. An output shaft is arranged on the left side of the second electric push rod 94, and the rack 95 is installed on the left side of the output shaft by a fixed connection method. The rack 95 is located at the lower end of the gear 93, and the rack 95 is meshed with the gear 93. When in use, after the electronic component 4 completes the detection of the upper end surface, the control panel 8 can immediately energize the second electromagnet 922 and the second electric push rod 94, so that the movable rod 351 is connected to the rotating shaft 92, and the second electric push rod 94 drives the rack 95 to extend to the left. At the same time, the rack 95 drives the gear 93 to flip 180 degrees, thereby synchronously driving the detection limit frame 3 and the electronic component 4 to flip, so that the detection board 7 can detect the other side of the electronic component 4.

[0040] The working principle of the utility model is: first connect the device to the power supply, then clamp a plurality of electronic components 4 into the detection limit frame 3 and fix them; the staff can manually insert the front end of the electronic component 4 into the limit groove 32, and then squeeze the clamping frame 333 backwards, clamp the rear end of the electronic component 4 into the clamping groove 3331 at the front end of the clamping frame 333, and then release the clamping frame 333, the spring 332 automatically extends, and the spring 332 pushes the clamping frame 333 to move forward to clamp and fix the electronic component 4. Start the conveyor belt 2, so that the conveyor belt 2 drives multiple electronic parts 4 to move horizontally from left to right. When the electronic parts 4 move to the lower end of the detection frame 5, start the first electric push rod 6 to move downward to automatically detect the electronic parts 4. After the electronic parts 4 complete the detection of the upper end surface, the control panel 8 can immediately energize the second electromagnet 922 and the second electric push rod 94, so that the movable rod 351 and the rotating shaft 92 are connected, and the second electric push rod 94 drives the rack 95 to extend to the left. At the same time, the rack 95 drives the gear 93 to flip 180 degrees, thereby synchronously driving the detection limit frame 3 and the electronic parts 4 to flip, so that the detection plate 7 can detect the other side of the electronic parts 4. If the detection is qualified, the detection board 7 sends a signal to the control panel 8, and the control panel 8 electrically connects the first electromagnet 102 on the left to energize it, so that the first electromagnet 102 is magnetically attracted to the first magnetic block 3332 at the rear end of the electronic component 4, and the clamping frame 333 moves backward, and the electronic component 4 automatically falls downward and is collected in the left storage frame 10; if the detection is unqualified, the control panel 8 electrically connects the first electromagnet 102 on the right to energize it, and the conveyor belt 2 continues to move. When the electronic component 4 moves to the front of the first electromagnet 102 on the right, the first electromagnet 102 is magnetically attracted to the first magnetic block 3332 at the rear end of the electronic component 4, and the clamping frame 333 moves backward, and the electronic component 4 automatically falls downward and is collected in the right storage frame 10.

[0041] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. An electronic parts continuous testing device capable of automatically dispensing materials, comprising a limit table (1), characterized in that: A conveyor belt (2) is movably mounted on the upper end of the limit platform (1), and a plurality of mounting holes (21) arranged in a transverse array are arranged inside the conveyor belt (2). First bearings (22) are fixedly embedded at the front and rear ends of the inner sides of the mounting holes (21). A limiting cylinder (35) is fixedly mounted inside the first bearing (22) at the front end, and a rotating rod (34) is fixedly mounted inside the first bearing (22) at the rear end. A detection limit frame (3) is fixedly mounted inside the rotating rod (34) and the limiting cylinder (35). The detection limit frame (3) is located in the mounting hole (21), and an electronic component (4) is mounted inside the detection limit frame (3). A detection frame (5) is fixedly mounted in the middle of the upper end of the limit platform (1), and a first electric push rod (6) is fixedly mounted in the middle of the upper end of the detection frame (5). An output shaft is arranged at the lower end of the first electric push rod (6), and a detection plate (7) is fixedly mounted at the lower end of the output shaft. A control panel (8) is fixedly mounted at the front end of the detection frame (5).

2. The electronic parts continuous testing equipment capable of automatic material separation according to claim 1 is characterized in that: A plurality of the detection limit frames (3) are each provided with a storage groove (31) at the rear end thereof; an elastic clamping assembly (33) is fixedly installed inside the storage groove (31); the elastic clamping assembly (33) comprises a telescopic rod (331), a spring (332) and a clamping frame (333); the telescopic rod (331) is installed at the rear end thereof in a fixed connection manner; the spring (332) is wound around the outside of the telescopic rod (331); the clamping frame (333) is installed at the front end of the telescopic rod (331) in a fixed connection manner; the clamping frame (333) is adapted to the shape of the storage groove (31); and a limit groove (32) is provided at the front end thereof.

3. The electronic parts continuous testing equipment capable of automatic material separation according to claim 2 is characterized in that: A plurality of the clamping frames (333) are each provided with a clamping slot (3331) at the front end, a first magnetic block (3332) is fixedly embedded at the rear end of the clamping frame (333), and a plurality of the electronic components (4) are clamped in the limiting slot (32) and the clamping slot (3331).

4. The electronic parts continuous testing equipment capable of automatic material separation according to claim 1 is characterized in that: Two laterally arranged material discharge holes (101) are arranged in the middle of the lower end of the limiting platform (1), and the material discharge holes (101) are respectively located below and to the lower right of the detection frame (5); two first electromagnets (102) are fixedly embedded in the middle of the rear end of the limiting platform (1), and the first electromagnets (102) are respectively located behind the two material discharge holes (101); the first electromagnets (102) are magnetically connected to the first magnetic block (3332); and two laterally arranged storage frames (10) are placed in the middle of the lower end of the limiting platform (1), and the storage frames (10) are respectively located below the two material discharge holes (101).

5. The electronic parts continuous testing equipment capable of automatic material separation according to claim 1 is characterized in that: A movable rod (351) is slidably mounted at the rear end of each of the plurality of limit cylinders (35), and a second magnetic block (352) is fixedly embedded at one end of the movable rod (351) away from the detection limit frame (3).

6. The electronic parts continuous testing equipment capable of automatic material separation according to claim 1 is characterized in that: A flip assembly (9) is fixedly mounted at the middle of the front end of the limit platform (1), and the flip assembly (9) comprises a second bearing (91) and a rotating shaft (92). The second bearing (91) is mounted at the middle of the front end of the limit platform (1) by a fixed embedding manner, and the rotating shaft (92) is mounted inside the second bearing (91) by a fixed connection manner. A slot (921) is provided at the middle of the rear end of the rotating shaft (92), and a second electromagnet (922) is fixedly embedded at the rear end of the rotating shaft (92). The second electromagnet (922) is magnetically connected to the second magnetic block (352).

7. The electronic parts continuous testing equipment capable of automatic material separation according to claim 5 is characterized in that: Slide grooves are arranged on both sides of the plurality of limit cylinders (35), and clamping blocks are fixedly installed at the rear ends of both sides of the plurality of movable rods (351), and the clamping blocks are clamped in the slide grooves.

8. The electronic parts continuous testing equipment capable of automatic material separation according to claim 6 is characterized in that: The flip assembly (9) further comprises a gear (93), a second electric push rod (94) and a rack (95); the gear (93) is fixedly mounted on the front end of the rotating shaft (92); the second electric push rod (94) is mounted on the middle part of the front end of the limit platform (1) by means of a fixed connection; an output shaft is arranged on the left side inside the second electric push rod (94); the rack (95) is mounted on the left side of the output shaft by means of a fixed connection; the rack (95) is located at the lower end of the gear (93), and the rack (95) is meshedly connected with the gear (93).

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