Automatic assembling device for inner supporting legs of semitrailer

Abstract

The utility model relates to an automatic assembling device for inner supporting legs of a semitrailer, and belongs to the technical field of production automation assembling and welding. According to the technical scheme, a round pipe centering and clamping mechanism and a square pipe centering and clamping mechanism are arranged front and back, the vertical center faces of the round pipe centering and clamping mechanism and the square pipe centering and clamping mechanism coincide, the square pipe centering and clamping mechanism is used for clamping a square pipe, the round pipe centering and clamping mechanism is used for clamping a round pipe, and a square pipe supporting mechanism is used for supporting the square pipe; a square tube axial jacking mechanism is arranged on the rear side of the square tube centering and clamping mechanism and is used for axially positioning the square tube and pushing the square tube to the round tube, so that the square tube is attached to the round tube; the length detection mechanism is used for detecting the length of the workpiece. The automatic detection device has the positive effects that the workpieces are positioned, pressed and detected automatically after being placed by the automatic feeding mechanism, so that the detection time and labor are greatly saved. Unmanned operation is achieved, and the device can be integrated in an automatic welding production line.

Description

Technical Field

[0001] The utility model relates to an automatic assembling device for supporting legs inside a semitrailer, which is suitable for an automatic assembling welding station in a supporting leg welding production line inside a semitrailer compartment, and belongs to the technical field of production automation assembly welding. Background Art

[0002] With the rapid development of China's logistics and transportation industry, the domestic semi-trailer market demand continues to grow. At the same time, the continuous improvement of technical level has also promoted the rapid development of the domestic semi-trailer industry. The outriggers are composed of inner outriggers and outer outriggers. The inner outriggers are internal components of the semi-trailer outriggers. Their function is to support the semi-trailer when the tractor and the semi-trailer are disconnected. In order to adapt to the height changes of the semi-trailer, the outriggers are equipped with spiral lifting mechanisms to enable the connection and disconnection of the semi-trailer and the tractor to proceed smoothly. Due to the continuous increase in demand, the traditional manual assembly fixtures are not reliable and labor-intensive, which consumes manpower and time. It is difficult to ensure the continuity of production and increases production costs. The current manual assembly method cannot meet the needs of social development. With the development of social productivity, high requirements are also placed on productivity and automation rate. A set of automatic assembly devices that can be integrated into the automatic welding production line is required. Utility Model Content

[0003] The purpose of the utility model is to provide an automatic outrigger assembly device for a semi-trailer. After the workpiece is placed by the automatic feeding mechanism, the positioning, pressing and detection are all completed automatically, which greatly saves the detection time and manpower, improves work efficiency, and solves the above-mentioned problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] The invention discloses an automatic assembly device for supporting legs in a semitrailer, comprising a square tube supporting mechanism, a square tube centering clamping mechanism, a square tube axial jacking mechanism, a round tube centering clamping mechanism and a length detection mechanism installed on a support. The round tube centering clamping mechanism and the square tube centering clamping mechanism are arranged front and back and their vertical center planes coincide with each other. The square tube centering clamping mechanism is used to clamp the square tube, the round tube centering clamping mechanism is used to clamp the round tube, and the square tube supporting mechanism is used to support the square tube. A square tube axial jacking mechanism is provided at the rear side of the square tube centering clamping mechanism. The square tube axial jacking mechanism is used to axially position the square tube and push the square tube toward the round tube so that the square tube fits with the round tube. The length detection mechanism is used to detect the length of the workpiece.

[0006] Furthermore, the square tube centering clamping mechanism includes a support two, a tightening cylinder one, a transmission mechanism one, a detection switch one, a transition frame one, a clamping wheel and a material detection switch. The transition frame one is a T-shaped structure, and there are two of them, which are symmetrically slidably arranged on both sides above the support two, and the support two is arranged on the upper end surface of the middle part of the support one, and a transmission mechanism one is arranged inside the support two; the transmission mechanism one includes a slider one, a gear one, a rack one, a connecting frame one and a rack two, and the opposite sides of the two transition frames one are provided with clamping wheels and material detection switches, and the bottom of one of the transition frames one is connected to the connecting frame one through a slider one, and the end of the connecting frame one is connected to the cylinder rod of the tightening cylinder one, and the bottom of the connecting frame one is connected to one end of the rack two; the bottom of the other transition frame one is provided with a rack one, and the rack one is meshed with the other end of the rack two through the gear one, and the gear one is rotatably arranged on the support two through the center axis two.

[0007] Furthermore, there are two clamping wheels on the transition frame 1, which are respectively arranged on the central axis 1 on the front and rear sides of the transition frame 1; and a groove is provided in the middle of the clamping wheel.

[0008] Furthermore, the square tube axial clamping mechanism includes a clamping block and a clamping cylinder 2. The clamping cylinder 2 is arranged on a support 1. A slide is provided at the rear of the support 1. The clamping block is connected to the cylinder rod of the clamping cylinder 2. The clamping block moves along the slide with the cylinder rod of the clamping cylinder 2 to realize the axial positioning of the square tube.

[0009] Furthermore, the round tube centering clamping mechanism includes a support three, a tightening cylinder three, a detection switch two, a transition frame two, a transmission mechanism two and a positioning clamping head. The support three is arranged on the lower end surface of the front part of the support one. The transition frame two is an L-shaped structure, and there are two of them, which are symmetrically slidably arranged on the support one on the left and right sides. Positioning clamping heads are provided on the opposite sides of the two transition frames two; a tightening cylinder three and a transmission mechanism two are provided in the support three, and the transmission mechanism two includes a slider two, a gear two, a rack three, a connecting frame two and a rack four. The connecting frame two and The cylinder rod of the tightening cylinder three is connected, the connecting frame two is slidably set in the support three, the slider two and the rack three are respectively connected to the two ends of the connecting frame two, the gear two is rotatably set on the support three through the center axis three, the rack three and the rack four are respectively meshed on both sides of the gear two, the rack four is slidably set on the support three, one of the transition frames two is connected to the slider two, and the other transition frame two is connected to the rack four; a detection switch two is provided on the side of the support three adjacent to the tightening cylinder three, and the detection switch two is used to detect whether the tightening cylinder three is clamped or released in place.

[0010] Furthermore, the end of the positioning clamping head that contacts the round tube is a conical structure and has an anti-misalignment groove, and the groove is aligned with the protrusion inside the round tube.

[0011] Furthermore, the square tube support mechanism comprises two support blocks, one of which is located between the square tube centering clamping mechanism and the round tube centering clamping mechanism, and the other support block is located between the square tube centering clamping mechanism and the square tube axial clamping mechanism.

[0012] Furthermore, the length detection mechanism includes a displacement detection sensor and a connector. The displacement detection sensor is arranged at the rear part of the support. One end of the connector is connected to the extension rod of the displacement detection sensor, and the other end is connected to the clamping block. The extension rod of the displacement detection sensor moves synchronously with the clamping block. When the clamping block touches the end face of the square tube, the displacement detection sensor transmits the value at this time to the PLC, and then calculates the required size, determines whether the size is qualified after automatic assembly and records it.

[0013] The tightening cylinder 1, tightening cylinder 2, tightening cylinder 3, detection switch 1, detection switch 2, displacement detection sensor and length detection mechanism are all well-known and commonly used equipment in the art.

[0014] The utility model supports the square tube through two support blocks, ensuring stable support and reducing the contact surface between the square tube and the support blocks. The center of the square tube is kept at the center of the clamp through the square tube centering clamping mechanism. There is a groove in the middle of the clamping wheel to ensure stable clamping and reduce the contact surface between the square tube and the clamping wheel, reducing the influence of the shape problem of the square tube itself on the assembly accuracy. The round tube is positioned through the round tube centering clamping mechanism. The positioning clamping head adopts conical surface positioning to ensure that the center of the round tube is on the center of the clamp. The positioning clamping head is provided with an anti-error groove. If the direction of the round tube is incorrect, the top clamping cylinder three cannot be clamped in place, and the detection switch two will send a signal. After the round tube is positioned and clamped, the top clamping cylinder two clamps to make the square tube fit to the surface of the round tube.

[0015] The positive effects of the utility model are as follows: 1. After the workpiece is placed by the automatic feeding mechanism, the positioning, pressing and detection are all completed automatically, which greatly saves the time and manpower of detection. 2. It realizes unmanned operation and can be integrated into the automatic welding production line. 3. Through the measurement of the displacement detection sensor, the system automatically determines whether it is qualified, with high accuracy, avoiding manual misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural front view of the automatic assembly device for inner legs of the utility model;

[0017] Figure 2 It is a top view of the structure of the automatic assembly device of inner legs of the utility model;

[0018] Figure 3 It is an isometric view of the automatic assembly device for inner legs of the utility model;

[0019] Figure 4This is a structural cross-sectional view of the automatic assembly device for inner legs of the utility model;

[0020] Figure 5 This is a structural cross-sectional view of the square tube centering clamping mechanism of the utility model;

[0021] Figure 6 It is an isometric view of the square tube centering clamping mechanism of the utility model;

[0022] Figure 7 This is a structural cross-sectional view of the circular tube centering clamping mechanism of the utility model;

[0023] Figure 8 It is an isometric side view of the circular tube centering clamping mechanism of the utility model;

[0024] Fig. 9 This is a schematic diagram of the use status of the automatic assembly device for inner legs of the utility model;

[0025] Fig.10 This is a structural front view of the inner leg of the utility model;

[0026] Fig.11 This is a structural side view of the inner leg of the utility model;

[0027] Fig.12 This is a top view of the structure of the inner leg of the utility model;

[0028] Fig.13 It is an isometric view of the structure of the inner leg of the utility model;

[0029] In the figure: support 1; support block 2; support 2 3; tightening cylinder 1 4; in-position detection switch 5; transition frame 1 6; slider 1 7; gear 1 8; rack 1 9; connecting frame 1 10; rack 2 11; clamping wheel 12; material detection switch 13; clamping block 14; tightening cylinder 2 15; support 3 16; tightening cylinder 3 17; detection switch 18; transition frame 2 19; slider 2 20; gear 2 21; rack 3 22; connecting frame 2 23; rack 4 24; positioning clamping head 25; displacement detection sensor 26; connecting head 27; round tube 28; square tube 29. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] See attached Figure 1-13A semi-trailer inner outrigger automatic assembly device comprises a square tube support mechanism, a square tube centering clamping mechanism, a square tube axial jacking mechanism, a round tube centering clamping mechanism and a length detection mechanism installed on a support 1, wherein the round tube centering clamping mechanism and the square tube centering clamping mechanism are arranged front and back and the vertical center planes of the two coincide, the square tube centering clamping mechanism is used to clamp the square tube 29, the round tube centering clamping mechanism is used to clamp the round tube 28, and the square tube support mechanism is used to support the square tube 29; a square tube axial jacking mechanism is provided at the rear side of the square tube centering clamping mechanism, and the square tube axial jacking mechanism is used to axially position the square tube 29, push the square tube 29 toward the round tube 28, and make the square tube 29 fit the round tube 28; the length detection mechanism is used to detect the length of the workpiece.

[0032] The square tube centering clamping mechanism includes a support 23, a tightening cylinder 14, a transmission mechanism 1, a detection switch 15, a transition frame 16, a clamping wheel 12 and a material detection switch 13. The transition frame 16 is a T-shaped structure, and there are two of them, which are symmetrically slidably arranged on both sides above the support 23. The support 23 is arranged on the upper end surface of the middle part of the support 1, and a transmission mechanism 1 is arranged inside the support 23; the transmission mechanism 1 includes a slider 17, a gear 18, a rack 19, a connecting frame 10 and a rack 211. The opposite sides of the two transition frames 1 are provided with clamping wheels 12 and material detection switches 13, the bottom of one of the transition frames 16 is connected to the connecting frame 10 through a slider 7, the end of the connecting frame 10 is connected to the cylinder rod of the tightening cylinder 4, and the bottom of the connecting frame 10 is connected to one end of the rack 2 11; the bottom of the other transition frame 6 is provided with a rack 9, the rack 9 is meshed with the other end of the rack 2 11 through a gear 8, and the gear 8 is rotatably set on the support 2 3 through the center axis 2.

[0033] There are two clamping wheels 12 on the transition frame 6, which are respectively arranged on the central axis 1 on the front and rear sides of the transition frame 6; a groove is provided in the middle of the clamping wheel 12.

[0034] The square tube axial clamping mechanism includes a clamping block 14 and a clamping cylinder 15. The clamping cylinder 15 is arranged on a support 1. A slide is provided at the rear of the support 1. The clamping block 14 is connected to the cylinder rod of the clamping cylinder 15. The clamping block 14 moves along the slide with the cylinder rod of the clamping cylinder 15 to realize the axial positioning of the square tube.

[0035] The circular tube centering clamping mechanism includes a support three 16, a tightening cylinder three 17, a detection switch two 18, a transition frame two 19, a transmission mechanism two and a positioning clamping head 25. The support three 16 is arranged on the lower end surface of the front part of the support one 1. The transition frame two 19 is an L-shaped structure, and there are two of them, which are symmetrically slidably arranged on the support one 1 respectively. The opposite sides of the two transition frames two 19 are provided with positioning clamping heads 25; the support three 16 is provided with a tightening cylinder three 17 and a transmission mechanism two, and the transmission mechanism two includes a slider two 20, a gear two 21, a rack three 22, a connecting frame two 23 and a rack four 24. The connecting frame two 23 and the tightening cylinder three 1 7 is connected to the cylinder rod, the connecting frame 23 is slidably set in the support 3 16, the slider 20 and the rack 3 22 are respectively connected to the two ends of the connecting frame 23, the gear 21 is rotatably set on the support 3 16 through the center axis 3, the rack 3 22 and the rack 4 24 are respectively meshed on both sides of the gear 21, the rack 4 24 is slidably set on the support 3 16, one of the transition frames 2 19 is connected to the slider 20, and the other transition frame 2 19 is connected to the rack 4 24; a detection switch 2 18 is provided on the side of the support 3 16 adjacent to the tightening cylinder 3 17, and the detection switch 2 18 is used to detect whether the tightening cylinder 3 17 is clamped or released in place.

[0036] The end of the positioning clamping head 25 that contacts the round tube is a conical structure and has an anti-misalignment groove, which is aligned with the protrusion inside the round tube.

[0037] The square tube support mechanism includes two support blocks 2, one of which is located between the square tube centering clamping mechanism and the round tube centering clamping mechanism, and the other support block 2 is located between the square tube centering clamping mechanism and the square tube axial clamping mechanism.

[0038] The length detection mechanism includes a displacement detection sensor 26 and a connector 27. The displacement detection sensor 26 is arranged at the rear of the support 1. One end of the connector 27 is connected to the extension rod of the displacement detection sensor 26, and the other end is connected to the clamping block 14. The extension rod of the displacement detection sensor moves synchronously with the clamping block 14. When the clamping block 14 contacts the end face of the square tube, the displacement detection sensor 26 transmits the value at this time to the PLC. The displacement detection sensor can detect the actual arrival position of the cylinder rod of the clamping cylinder 2, and transmit the detection value to the PLC to realize the detection of the specific length of the workpiece.

[0039] In this embodiment: the semi-trailer inner outrigger automatic assembly device includes a square tube support mechanism, a square tube centering clamping mechanism, a square tube axial jacking mechanism, a round tube centering clamping mechanism and a length detection mechanism. All the mechanisms are connected together through a support 1. After installation, it should be ensured that the vertical center plane of the square tube centering clamping mechanism and the round tube centering clamping mechanism coincide. The square tube is supported by two support blocks 2, and the center of the square tube is kept at the center of this set of clamps through the square tube centering clamping mechanism. Two support blocks 2 are used to ensure stable support and reduce the contact surface between the square tube and the support blocks 2. A groove is provided in the middle of the clamping wheel 12 to ensure stable clamping and reduce the contact surface between the square tube and the clamping wheel, thereby reducing the influence of the shape problem of the square tube itself on the assembly accuracy. The round tube is positioned by the round tube centering clamping mechanism, and the positioning clamping head 25 adopts a conical surface positioning to ensure that the center of the round tube is at the center of the clamp, and finally the center plane of the square tube coincides with the center plane of the round tube. The positioning clamping head 25 contacts the inner hole of the round tube with a conical surface and has an anti-error groove. If the direction of the round tube is incorrect, the clamping cylinder three 17 cannot clamp it into place, and the detection switch two 18 will send a signal, indicating that there is a problem with the direction of the round tube when loading, and assembly welding is not allowed. After the round tube is positioned and clamped, the clamping cylinder two 15 clamps it to make the square tube 29 fit to the surface of the round tube 28. The total length of the inner leg after assembly is detected by the displacement detection sensor 26, and the next welding action is allowed within the required tolerance range.

[0040] Among them, Figure 3 As shown, the square tube support mechanism is used to support the square tube, and includes a support block 2, and the number of the support blocks 2 is two, which are jointly arranged on a support 1. The support 1 can be connected to other brackets or positioners to meet the requirements of robot welding.

[0041] Among them, Figure 5 and 6As shown, the square tube centering clamping mechanism is used to position and clamp the square tube, including a support 23, a clamping cylinder 14, a detection switch 15, a transition frame 16, a slider 17, a gear 18, a rack 19, a connecting frame 10, a rack 211, a clamping wheel 12 and a material detection switch 13. The square tube centering clamping mechanism is arranged in the middle of the support 1, and the clamping wheel 12 and the material detection switch 13 are arranged on the transition frame 16, wherein the transition frame 16 is a T-shaped structure, and there are two of them, and the two transition frames 6 are arranged symmetrically on the left and right. The clamping wheel 12 can rotate around the central axis 1 to prevent the workpiece from being scratched, and each transition frame 16 is provided with two clamping wheels 12. The connecting frame 10 is connected to the cylinder rod of the clamping cylinder 4, the slider 17 and the rack 211 are connected to the connecting frame 10, the gear 8 is arranged on the support 23 and can rotate around the central axis 2, and the rack 19 is arranged on the support 23 and can slide. When the cylinder rod of the tightening cylinder 4 moves, due to the gear rack transmission, the slider 7 and the rack 9 move towards each other, that is, move inward or outward at the same time, driving the transition frame 6 and the clamping wheel 12 to move at the same time, realizing the centering clamping or loosening action of the square tube, and making the center plane of the square tube coincide with the center plane of the square tube centering clamping mechanism. The material detection switch 13 is used to detect whether there is a square tube on the automatic assembly device, and the detection switch 5 is used to detect whether the cylinder is clamped or loosened in place.

[0042] Among them, Figure 4 As shown, the square tube axial clamping mechanism is used for axially positioning the square tube, and includes a clamping block 14 and a clamping cylinder 15. The clamping cylinder 15 is arranged on a support 1, and the clamping block 14 is connected to the cylinder rod. The clamping block 14 moves with the cylinder rod to realize axial clamping of the square tube.

[0043] Among them, Figure 7-8As shown, the round tube centering clamping mechanism is used to position and clamp the steel tube, including a support 16, a clamping cylinder 17, a detection switch 18, a transition frame 19, a slider 20, a gear 21, a rack 3 22, a connecting frame 23, a rack 4 24 and a positioning clamping head 25. The round tube centering clamping mechanism is arranged on the support 1, and the clamping cylinder 17 is arranged inside the support 16 to make the structure compact. The positioning clamping head 25 is arranged on the transition frame 19, wherein the positioning clamping head 25 contacts the round tube with a conical structure and has a groove for preventing errors. The groove should be aligned with the protrusion inside the round tube, and the number is two. The transition frame 19 is an L-shaped structure, and the number is two. The two transition frames 19 are arranged symmetrically on the left and right. The connecting frame 23 is connected to the cylinder rod of the jacking cylinder 3 17, the slider 20 and the rack 3 22 are connected to the two ends of the connecting frame 23 respectively, the gear 21 is arranged on the support 3 16, and can rotate around the central axis 3, and the rack 4 24 is arranged on the support 3 16, and can slide. When the cylinder rod of the jacking cylinder 3 17 moves, due to the gear and rack transmission, the slider 20 and the rack 4 24 move towards each other, that is, move inward or outward at the same time, driving the transition frame 2 19 and the positioning clamping head 25 to move at the same time, realizing the centering clamping or loosening action of the round tube, and making the center plane of the round tube coincide with the center plane of the round tube centering clamping mechanism. The detection switch 2 18 is used to detect whether the cylinder is clamped or loosened in place.

[0044] Among them, Figure 1 and 4 As shown, the length detection mechanism is used to detect the length of the workpiece, including a displacement detection sensor 26 and a connector 27. The displacement detection sensor 26 is arranged on the support 1, one end of the connector 27 is connected to the extension rod of the displacement detection sensor 26, and the other end is connected to the clamping block 14, so that the extension rod of the displacement sensor moves synchronously with the clamping block 14. When the clamping block 14 contacts the end face of the square tube, the displacement detection sensor 26 transmits the value at this time to the PLC, and then calculates the required size, determines whether the size after automatic assembly is qualified and records it.

Claims

1. An automatic outrigger assembly device for a semitrailer, characterized in that: The invention comprises a square tube support mechanism, a square tube centering clamping mechanism, a square tube axial pressing mechanism, a round tube centering clamping mechanism and a length detection mechanism installed on a support seat (1); the round tube centering clamping mechanism and the square tube centering clamping mechanism are arranged front and back and the vertical center planes of the two coincide; the square tube centering clamping mechanism is used to clamp the square tube (29); the round tube centering clamping mechanism is used to clamp the round tube (28); the square tube support mechanism is used to support the square tube (29); a square tube axial pressing mechanism is provided at the rear side of the square tube centering clamping mechanism; the square tube axial pressing mechanism is used to axially position the square tube (29) and push the square tube (29) toward the round tube (28) so that the square tube (29) and the round tube (28) fit together; the length detection mechanism is used to detect the length of the workpiece.

2. The automatic outrigger assembly device for a semitrailer according to claim 1, characterized in that: The square tube centering clamping mechanism comprises a support 2 (3), a tightening cylinder 1 (4), a transmission mechanism 1, a detection switch 1 (5), a transition frame 1 (6), a clamping wheel (12) and a material detection switch (13). The transition frame 1 (6) is a T-shaped structure, and there are two of them, which are symmetrically slidably arranged on both sides above the support 2 (3). The support 2 (3) is arranged on the upper end surface of the middle part of the support 1 (1). The support 2 (3) is provided with a transmission mechanism 1 inside; the transmission mechanism 1 comprises a slider 1 (7), a gear 1 (8), a rack 1 (9), a connecting frame 1 (10) and a rack 2 (11). The opposite sides of the two transition frames are provided with clamping wheels (12) and material detection switches (13), the bottom of one of the transition frames (6) is connected to the connecting frame (10) through a slider (7), the end of the connecting frame (10) is connected to the cylinder rod of the tightening cylinder (4), and the bottom of the connecting frame (10) is connected to one end of the rack (11); the bottom of the other transition frame (6) is provided with a rack (9), the rack (9) is meshed with the other end of the rack (11) through a gear (8), and the gear (8) is rotatably arranged on the support (3) through the central axis (2).

3. The automatic assembling device for supporting legs in a semitrailer according to claim 2, characterized in that: There are two clamping wheels (12) on the transition frame 1 (6), which are respectively arranged on the central axis 1 on the front and rear sides of the transition frame 1 (6).

4. The automatic outrigger assembly device for a semitrailer according to claim 2 or 3, characterized in that: A groove is provided in the middle of the clamping wheel (12).

5. The automatic outrigger assembly device for a semitrailer according to claim 1 or 2, characterized in that: The square tube axial clamping mechanism comprises a clamping block (14) and a clamping cylinder (15). The clamping cylinder (15) is arranged on a support (1). A slide is arranged at the rear of the support (1). The clamping block (14) is connected to the cylinder rod of the clamping cylinder (15). The clamping block (14) moves along the slide with the cylinder rod of the clamping cylinder (15) to achieve axial positioning of the square tube (29).

6. The automatic outrigger assembly device for a semitrailer according to claim 1 or 2, characterized in that: The round tube centering clamping mechanism comprises a support three (16), a tightening cylinder three (17), a detection switch two (18), a transition frame two (19), a transmission mechanism two and a positioning clamping head (25), wherein the support three (16) is arranged on the lower end surface of the front part of the support one (1), the transition frame two (19) is an L-shaped structure, the number of which is two, and they are respectively symmetrically slidably arranged on the support one (1), and the two transition frames two (19) are provided with a positioning clamping head (25) on opposite sides; the support three (16) is provided with a tightening cylinder three (17) and a transmission mechanism two, and the transmission mechanism two comprises a slider two (20), a gear two (21), a rack three (22), a connecting frame two (23) and a rack four (24), and the connecting frame two (23) and the tightening cylinder three (17) are connected to each other. The connecting frame 2 (23) is slidably arranged in the support 3 (16), the slider 2 (20) and the rack 3 (22) are respectively connected to the two ends of the connecting frame 2 (23), the gear 2 (21) is rotatably arranged on the support 3 (16) through the central axis 3, the rack 3 (22) and the rack 4 (24) are respectively meshed on the two sides of the gear 2 (21), and the rack 4 (24) is slidably arranged on the support 3 (16), one of the transition frames 2 (19) is connected to the slider 2 (20), and the other transition frame 2 (19) is connected to the rack 4 (24); a detection switch 2 (18) is provided on one side of the support 3 (16) adjacent to the tightening cylinder 3 (17), and the detection switch 2 (18) is used to detect whether the tightening cylinder 3 (17) is clamped or released in place.

7. The automatic assembling device for supporting legs in a semitrailer according to claim 6, characterized in that: The end of the positioning clamping head (25) that contacts the round tube (28) is a conical structure and has an anti-misalignment groove, and the groove is aligned with the protrusion inside the round tube (28).

8. The automatic assembling device for supporting legs in a semitrailer according to claim 1 or 2, characterized in that: The square tube support mechanism comprises a support block (2), the number of the support blocks (2) being two, one of the support blocks (2) being located between the square tube centering clamping mechanism and the round tube centering clamping mechanism, and the other support block (2) being located between the square tube centering clamping mechanism and the square tube axial clamping mechanism.

9. The automatic outrigger assembly device for a semitrailer according to any one of claims 1 to 8, characterized in that: The length detection mechanism comprises a displacement detection sensor (26) and a connector (27). The displacement detection sensor (26) is arranged at the rear of the support (1). One end of the connector (27) is connected to an extension rod of the displacement detection sensor (26), and the other end is connected to a pressing block (14). The extension rod of the displacement detection sensor (26) moves synchronously with the pressing block (14). When the pressing block (14) contacts the end face of the square tube (29), the displacement detection sensor (26) transmits the value at this time to the PLC.

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