Engineering truck rear protective fence assembly and production detection device thereof

Abstract

The invention discloses an engineering van rear protective fence assembly and a production detection device thereof, and relates to the technical field of engineering van rear protective fence production, the engineering van rear protective fence assembly comprises a rigidity detection assembly, the rigidity detection assembly comprises a control cylinder, a communicating pipe, an upper cavity, an upper piston, an abutting block, a lower cavity, a lower piston, a reset spring, an adjusting screw rod and a contact switch, the output end of the control air cylinder is fixedly connected with a communicating pipe. In the using process, the adjusting screw rod is in threaded connection with the tail end of the lower cavity, the distance between the contact switch and the lower piston is adjusted by rotating the adjusting screw rod, and then control over continuous force application of the air cylinder is stopped when the lower piston makes contact with the contact switch at the tail end of the adjusting screw rod; according to the invention, the swing arms at the two sides are both provided with the rigidity detection assemblies, so that rigidity testing can be synchronously carried out on the welding joints of the two ends of the rod piece and the wing plate, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of production of rear guardrails of engineering vehicles, and in particular to an engineering vehicle rear guardrail assembly and a production and detection device thereof. Background Art

[0002] The rear guardrail is installed between the rear slope of the vehicle and the carriage to prevent cargo from falling and collisions with pedestrians or other vehicles. The rear guardrail assembly usually consists of a rod with process holes and wing plates welded and fixed to its two ends of the outer edge.

[0003] In the prior art, the process holes on the rod are usually used as a positioning means for welding the wing plates at both ends of its outer edge, and then the rod and the wing plates at both ends are combined and fixed by manual welding. There is often an inaccurate positioning problem due to manual errors, and the quality of welding is directly related to the quality and even safety of the finished product. The manual inspection in the prior art is mainly based on the welder's experience and judgment, and the welding quality is judged by observing the welding quality and flatness of the welding area. The welding quality inspection method based on manual experience is often inaccurate due to the inconsistent standards.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a rear guardrail assembly for an engineering vehicle and a production and testing device thereof are proposed. Summary of the invention

[0005] The object of the present invention is to provide a rear guardrail assembly for an engineering vehicle and a production and detection device thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a production detection device, comprising a stiffness detection component, the stiffness detection component comprising a control cylinder, a connecting pipe, an upper cavity, an upper piston, an abutment block, a lower cavity, a lower piston, a return spring, an adjusting screw and a contact switch, the output end of the control cylinder is fixedly connected with a connecting pipe, and the upper end of the "U"-shaped channel of the connecting pipe is provided with an upper cavity, an upper piston is slidably installed inside the upper cavity, and an abutment block is fixedly connected to the outer side of the upper piston, a lower cavity is provided at the lower end of the "U"-shaped channel of the connecting pipe, and a lower piston is slidably installed inside the lower cavity, the "U"-shaped channel between the lower piston and the upper piston is filled with hydraulic oil, and the lower piston and the upper piston are elastically connected to the inner walls on different sides of the connecting pipe through return springs respectively, an adjusting screw is threadedly connected to the inner wall of the lower cavity close to the lower piston, and the adjusting screw is located in the middle gap of the return spring in the lower cavity, and a contact switch is connected to the end of the adjusting screw.

[0007] Furthermore, the stiffness detection component is fixedly connected to the middle part of the swing arm, and a switch housing is fixed to one end of the outer side of the swing arm, a positioning ball is embedded in the opening of the switch housing, and the positioning ball is elastically connected to the bottom end of the switch housing through a compression spring, and a proximity switch is provided at the bottom end of the switch housing for sensing the change in distance of the positioning ball and sending a switch signal.

[0008] Furthermore, a rotating pin is fixed to one end of the inner side of the swing arm, and the rotating pin is rotatably connected to the two side edges of the side plate, and two downwardly recessed guiding inclined grooves are opened on the top plane of the side plate.

[0009] Furthermore, a double-axis cylinder is provided at the middle end of the root of the side plate, and telescopic rods are fixedly connected to the output ends on both sides of the double-axis cylinder, and the output ends of the telescopic rods are transmission-connected to the sliding grooves at the root of the swing arm.

[0010] Furthermore, the side plates are welded and fixed to the side ends of the welding workbench, and a receiving concave surface which is recessed downward is provided on the top of the welding workbench.

[0011] Furthermore, the receiving concave surface receives a rod body inside, and a process hole deviating from the center of the circle is opened at the end of the rod body, and the plane of the end of the rod body and the positioning ball are rollingly matched, and the process hole at the end of the rod body and the positioning ball are embedded and positioned.

[0012] Furthermore, rollers are rotatably installed at both ends of the arc surface that receives the concave surface, and the roller at one end is coaxially driven with the corresponding pulley. The pulley is rotated by the transmission belt and the output end of the pulley motor, and the pulley motor is fixedly installed at the bottom end of the welding workbench.

[0013] Furthermore, a loading and unloading assembly is fitted on the side of the welding workbench, and the loading and unloading assembly includes a bracket, a guide bar, a driving motor, a sprocket and a chain. The inner walls of the brackets on both sides are fixed with guide bars of an annular structure, and the outer wall of the bracket at one end is fixed with a driving motor. The driving motor is connected to the sprocket through a gear set, and the input end sprocket is connected to the driven end sprocket through a chain.

[0014] Furthermore, the loading and unloading assembly also includes an electromagnetic seat, a wing plate, a trigger terminal and a hinge. The electromagnetic seat is hinged on the chain at equal intervals, and the wing plate is fixed with a flat magnetic attraction on the top of the electromagnetic seat, and the wing plate is attached to the outer edge of the rod body through the guide inclined grooves on both sides of the side plate and fixed by a welding robot arm. A trigger terminal is fixed to one end of the electromagnetic seat close to the side plate, and the trigger terminal is in contact with the contact at the corresponding position on the welding workbench. A hinge is fixedly installed on the bottom of the electromagnetic seat, and the hinge is slidably matched with the annular structure guide bar on the inner wall of the bracket, and the hinge is hinged and fixed to the chain.

[0015] A rear guardrail assembly of an engineering vehicle is inspected using the production inspection device.

[0016] The present invention provides an engineering vehicle rear guardrail assembly and a production and detection device thereof, which have the following beneficial effects: 1. During the use of the present invention, the present invention connects the adjusting screw with a thread at the end of the lower cavity, and adjusts the distance between the contact switch and the lower piston by rotating the adjusting screw, and then stops the continuous force of the control cylinder when the lower piston touches the contact switch at the end of the adjusting screw. After a period of time, the welding stiffness is judged by observing the welding of the rod and the wing plate. The present invention provides a stiffness detection component on both sides of the swing arm, and can simultaneously perform a stiffness test on the joints of the two ends of the rod and the wing plate to improve the detection efficiency; 2. During the use of the present invention, the present application realizes intermittent feeding of the wing plates at equal intervals by setting the loading and unloading components, and also realizes the positioning and unloading of the wing plates by contact-type cooperation between the trigger terminal and the contact at the corresponding position on the welding workbench. During unloading, the wing plates are not only guided by the guide chute grooves on both sides of the side plates to accurately combine with the preset installation position of the outer edge of the rod, but also prevent the displacement and dislocation of the wing plates during the welding process by the limiting effect of the guide chute grooves, thereby further improving the assembly quality; 3. During the use of the present invention, the positioning ball is located on the end plane of the rod and rolls in contact with it during the rotation of the rod, and is finally embedded in the process hole opened in the end plane of the rod. At this time, the proximity switch arranged at the bottom end of the switch housing senses the change in the distance of the positioning ball and sends a switch signal to control the stop of the pulley motor. At this time, the rod is positioned by the positioning ball due to the process hole opened in the end plane, which is conducive to the subsequent precise positioning of the welding position of the wing plates at both ends of the outer edge of the rod, thereby improving the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall left-side structure of the device of the present invention; Figure 2 It is a schematic diagram of the overall right side structure of the device of the present invention; Figure 3 This is a schematic diagram of the structure of the welding workbench of the present invention; Figure 4 It is a schematic diagram of the side plate structure of the present invention; Figure 5 This is a schematic diagram of the swing arm structure of the present invention; Figure 6 It is a structural schematic diagram of the stiffness detection component of the present invention; Figure 7 It is a schematic diagram of the structure of the loading and unloading components of the present invention.

[0018] In the figure: 1. Stiffness detection assembly; 101. Control cylinder; 102. Connecting pipe; 103. Upper cavity; 104. Upper piston; 105. Abutment block; 106. Lower cavity; 107. Lower piston; 108. Return spring; 109. Adjustment screw; 110. Contact switch; 2. Swing arm; 3. Switch housing; 4. Positioning ball; 5. Compression spring; 6. Rotation pin; 7. Side plate; 8. Guide chute; 9. Double-axis cylinder; 10. Telescopic rod; 11. Welding workbench; 12. Receiving concave surface; 13. Rod body; 14. Process hole; 15. Roller; 16. Pulley; 17. Pulley motor; 18. Loading and unloading assembly; 1801. Bracket; 1802. Guide bar; 1803. Driving motor; 1804. Sprocket; 1805. Chain; 1806. Electromagnetic seat; 1807. Wing plate; 1808. Trigger terminal; 1809. Hinge. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] See also Figures 1 to 6The present invention provides a technical solution: a production detection device, including a stiffness detection component 1, the stiffness detection component 1 includes a control cylinder 101, a connecting pipe 102, an upper cavity 103, an upper piston 104, an abutment block 105, a lower cavity 106, a lower piston 107, a return spring 108, an adjustment screw 109 and a contact switch 110, the output end of the control cylinder 101 is fixedly connected with the connecting pipe 102, and the upper end of the "U"-shaped channel of the connecting pipe 102 is provided with an upper cavity 103. 3. An upper piston 104 is slidably mounted inside the upper cavity 103, and an abutment block 105 is fixedly connected to the outer side of the upper piston 104. A lower cavity 106 is provided at the lower end of the "U"-shaped channel of the connecting tube 102, and a lower piston 107 is slidably mounted inside the lower cavity 106. The "U"-shaped channel between the lower piston 107 and the upper piston 104 is filled with hydraulic oil, and the lower piston 107 and the upper piston 104 are elastically connected to the inner wall of different sides of the connecting tube 102 through the return spring 108 respectively. An adjusting screw 109 is threadedly connected to the inner wall of the lower cavity 106 near the lower piston 107, and the adjusting screw 109 is located in the middle gap of the return spring 108 in the lower cavity 106, and the end of the adjusting screw 109 is connected to a contact switch 110, the stiffness detection component 1 is fixedly connected to the middle of the swing arm 2, and a switch housing 3 is fixed to one end of the outer side of the swing arm 2, a positioning ball 4 is embedded in the opening of the switch housing 3, and the positioning ball 4 is elastically connected to the bottom end of the switch housing 3 through a compression spring 5 , and a proximity switch is arranged at the bottom of the switch housing 3 to send a switch signal by sensing the distance change of the positioning ball 4, a rotating pin 6 is fixed at one end of the inner side of the swing arm 2, and the rotating pin 6 is rotatably connected to the two side edges of the side plate 7, and two downwardly concave guide inclined grooves 8 are opened on the top plane of the side plate 7, a double-axis cylinder 9 is arranged at the middle end of the root of the side plate 7, and the output ends of both sides of the double-axis cylinder 9 are fixedly connected with telescopic rods 10, and the output end of the telescopic rod 10 is transmission-connected to the slide groove at the root of the swing arm 2; The specific operation is as follows: after the wing plate 1807 is fixed to the two ends of the outer edge of the rod by welding with a welding robot, the control cylinder 101 in the middle of the swing arms 2 on both sides controls the extension of the connecting pipe 102, and through the gap between the outer edge of the rod and the side plate 7, the abutment block 105 at the end of the upper cavity 103 abuts against the welding part of the adjacent rod and the wing plate 1807. In the process of continuous force application, the upper piston 104 pumps hydraulic oil into the lower cavity 106, and drives the lower piston 107 to produce the same displacement. The present application threadedly connects the adjusting screw 109 at the end of the lower cavity 106, and adjusts the distance between the contact switch 110 and the lower piston 107 by rotating the adjusting screw 109, thereby adjusting the distance between the lower piston 107 and the adjusting screw 109. When the end contact switch 110 is touched, the continuous force of the control cylinder 101 is stopped. After a period of time, the welding stiffness is judged by observing the welding conditions of the rod and the wing plate 1807. The present application provides a stiffness detection assembly 1 on both sides of the swing arm 2, which can simultaneously test the stiffness of the joints welded between the two ends of the rod and the wing plate 1807 to improve the detection efficiency. After the welding operation and the stiffness detection operation are completed, the double-axis cylinder 9 drives the rocker arms on both sides to fold in the opposite direction through the telescopic rod 10, and the positioning ball 4 is used to limit the engagement of the process hole 14 opened at the end of the rod. The pulley motor 17 is started again and the rod is driven to rotate and straighten through the roller 15, so that the wing plate 1807 is disengaged from the guide inclined grooves 8 on both sides of the side plate 7. See also Figures 1 to 3 , the side plate 7 is welded and fixed to the side end of the welding workbench 11, and a downwardly concave receiving concave surface 12 is provided on the top of the welding workbench 11, a rod body 13 is received inside the receiving concave surface 12, and a process hole 14 deviating from the center of the circle is provided at the end of the rod body 13, and the plane at the end of the rod body 13 is rollingly matched with the positioning ball 4, and the process hole 14 at the end of the rod body 13 is embedded and positioned with the positioning ball 4, and rollers 15 are rotatably installed at both ends of the arc surface of the receiving concave surface 12, and the roller 15 at one end is coaxially driven with the corresponding pulley 16, and the pulley 16 is rotated and driven by the transmission belt and the output end of the pulley motor 17, and the pulley motor 17 is fixedly installed at the bottom end of the welding workbench 11; The specific operation is as follows: first, the rod is transferred to the welding workbench 11 by hoisting or conveyor belt and placed on the rollers 15 at both ends of the receiving concave surface 12; then, the double-axis cylinder 9 is activated and the telescopic rods 10 on both sides of its output end are connected to the transmission of the slide groove at the root of the swing arm 2, thereby driving the two side end surfaces of the swing arms 2 located on the side plates 7 to flip synchronously, so that the positioning ball 4 embedded in the opening of the switch housing 3 at one end of the outer side of the swing arm 2 fits with the plane of the end of the rod; finally, the pulley motor 17 is activated and the rollers coaxial with the pulley are driven by the transmission belt. The roller 15 rotates, thereby causing the rod to rotate. During the rotation of the rod, the positioning ball 4 is located on the end plane of the rod and rolls in contact with it, and is finally embedded in the process hole 14 opened on the end plane of the rod. At this time, the proximity switch set at the bottom end of the switch housing 3 senses the distance change of the positioning ball 4 and sends a switch signal to control the stop of the pulley motor 17. At this time, the rod is positioned by the positioning ball 4 because of the process hole 14 opened on the end plane, which is conducive to the subsequent precise positioning of the welding position of the wing plates 1807 at both ends of the outer edge of the rod, thereby improving the assembly quality. See also Figure 7 A loading and unloading assembly 18 is provided on the side of the welding workbench 11, and the loading and unloading assembly 18 includes a bracket 1801, a guide bar 1802, a driving motor 1803, a sprocket 1804 and a chain 1805. The inner walls of the brackets 1801 on both sides are fixed with a guide bar 1802 of an annular structure, and the outer wall of the bracket 1801 at one end is fixed with a driving motor 1803. The driving motor 1803 is connected to the sprocket 1804 through a gear set, and the input end sprocket 1804 is connected to the driven end sprocket 1804 through the chain 1805. The loading and unloading assembly 18 also includes an electromagnetic seat 1806, a wing plate 1807, a trigger terminal 1808 and a hinge 1809, and the chain Electromagnetic seats 1806 are hinged at equal intervals on 1805, and a wing plate 1807 is fixed to the top plane of the electromagnetic seat 1806 by magnetic attraction, and the wing plate 1807 is attached to the outer edge of the rod body 13 through the guide inclined grooves 8 on both sides of the side plate 7 and fixed by the welding mechanical arm, a trigger terminal 1808 is fixed to one end of the electromagnetic seat 1806 close to the side plate 7, and the trigger terminal 1808 is in contact with the contact at the corresponding position on the welding workbench 11, and a hinge 1809 is fixedly installed at the bottom of the electromagnetic seat 1806, and the hinge 1809 is slidably matched with the annular structure guide bar 1802 on the inner wall of the bracket 1801, and the hinge 1809 is hinged and fixed to the chain 1805; The specific operation is as follows: the sprockets 1804 at both ends of the transmission lower bracket 1801 of the driving motor 1803 are rotated and transmitted through the chain 1805. The present application has electromagnetic seats 1806 hinged at equal intervals on the chain 1805. The electromagnetic seats 1806 are adsorbed and fixed to the wing plates 1807 placed thereon when powered on. While realizing the equal-interval continuous transportation of the wing plates 1807, a trigger terminal 1808 is fixed to one end of the electromagnetic seat 1806 close to the side plate 7. The trigger terminal 1808 is further matched with the contact at the corresponding position on the welding workbench 11 through contact, so that the electromagnetic seat 1806 transported to the preset workstation is automatically powered off, and the wing plates 1807 are attached to the outer edges of the rod body 13 through the guide inclined grooves 8 on both sides of the side plate 7 and fixed by the welding robot arm. The welding process The middle part of the middle wing plate 1807 is limited by the guide bevel grooves 8 on both sides of the side plate 7 to prevent misalignment, so that the welding robot arm can easily pass through the gap between the side plate 7 and the outer edge of the rod to weld the joint between the root of the wing plate 1807 and the outer edge of the rod to form a rear guardrail assembly. The present application realizes the intermittent feeding of the wing plate 1807 at equal intervals through the setting of the loading and unloading assembly 18, and also realizes the positioning and unloading of the wing plate 1807 through the contact cooperation between the trigger terminal 1808 and the corresponding position contact on the welding workbench 11. During unloading, the wing plate 1807 is not only guided by the guide bevel grooves 8 on both sides of the side plate 7 to accurately combine with the preset installation position of the outer edge of the rod, but also prevents the displacement and misalignment of the wing plate 1807 during the welding process through the limiting effect of the guide bevel grooves 8, thereby further improving the assembly quality. A rear guardrail assembly for an engineering vehicle is inspected using the above-mentioned production inspection device, so that while the rod is automatically welded and assembled with the wing panel 1807, the welding quality at the joint between the rod and the wing panel 1807 is also inspected for stiffness, thereby ensuring the welding accuracy and simultaneously inspecting the welding quality, thereby improving product quality.

[0021] In summary, when using the engineering vehicle rear guardrail assembly and its production and testing device, the rod is first transferred to the welding workbench 11 by hoisting or conveyor belt and placed on the rollers 15 receiving the two ends of the concave surface 12, then the double-axis cylinder 9 is activated and connected to the transmission groove at the root of the swing arm 2 through the telescopic rods 10 on both sides of its output end, thereby driving the two side end surfaces of the swing arms 2 on the side plates 7 to flip synchronously, so that the positioning ball 4 embedded in the opening of the switch housing 3 at one end of the swing arm 2 is in contact with the end plane of the rod, finally, the pulley motor 17 is activated and the transmission belt is used to drive the roller 15 coaxial with the pulley to rotate, thereby causing the rod to rotate. During the rotation of the rod, the positioning ball 4 is located on its end plane and rolls in contact, and is finally embedded in the opening on the end plane of the rod. The process hole 14 is in the process hole 14. At this time, the proximity switch arranged at the bottom end of the switch housing 3 senses the distance change of the positioning ball 4 and sends a switch signal to control the stop of the pulley motor 17. At this time, the rod is positioned by the positioning ball 4 because of the process hole 14 opened on the end plane, which is beneficial to the subsequent precise positioning of the welding position of the wing plates 1807 at both ends of the outer edge of the rod, thereby improving the assembly quality. The chain 1805 is used for rotation transmission between the sprockets 1804 at both ends of the transmission lower bracket 1801 of the drive motor 1803. In the present application, electromagnetic seats 1806 are hinged at equal intervals on the chain 1805. When the electromagnetic seats 1806 are powered on, they are adsorbed and fixed to the wing plates 1807 placed thereon. While realizing the continuous conveying of the wing plates 1807 at equal intervals, the electromagnetic seats 1806 are also used to A trigger terminal 1808 is fixed at one end of the proximal side plate 7. The trigger terminal 1808 is further matched with the contact at the corresponding position on the welding workbench 11, so that the electromagnetic seat 1806 transported to the preset position is automatically powered off, and the wing plate 1807 is attached to the outer edge of the rod body 13 through the guide bevel grooves 8 on both sides of the side plate 7 and fixed by the welding robot arm. During the welding process, the middle part of the wing plate 1807 is limited by the guide bevel grooves 8 on both sides of the side plate 7 to prevent misalignment, so that the welding robot arm can easily pass through the gap between the side plate 7 and the outer edge of the rod, and weld the root of the wing plate 1807 to the outer edge of the rod to form a rear guardrail assembly. The present application realizes the intermittent feeding of the wing plate 1807 at equal intervals through the setting of the upper and lower material components 18. The positioning and unloading of the wing plate 1807 is realized by the contact-type cooperation between the trigger terminal 1808 and the contact at the corresponding position on the welding workbench 11. During unloading, the wing plate 1807 is not only guided by the guide bevel grooves 8 on both sides of the side plate 7 to be accurately combined with the preset installation position of the outer edge of the rod, but also prevents the displacement and misalignment of the wing plate 1807 during the welding process through the limiting effect of the guide bevel grooves 8, thereby further improving the assembly quality. After the wing plate 1807 is fixed to the two ends of the outer edge of the rod by welding robots, the control cylinder 101 in the middle of the swing arms 2 on both sides controls the extension of the connecting pipe 102, and through the gap between the outer edge of the rod and the side plate 7, the abutment block 105 at the end of the upper cavity 103 abuts against the welding part of the adjacent rod and the wing plate 1807. In the process of continuous force application,The upper piston 104 pumps hydraulic oil into the lower cavity 106, and drives the lower piston 107 to produce the same displacement. The present application threadedly connects the adjusting screw 109 at the end of the lower cavity 106, and adjusts the distance between the contact switch 110 and the lower piston 107 by rotating the adjusting screw 109, and then stops the continuous force of the control cylinder 101 when the lower piston 107 touches the contact switch 110 at the end of the adjusting screw 109. After maintaining for a period of time, the welding stiffness is judged by observing the welding condition of the rod and the wing plate 1807. The present application sets the swing arms 2 on both sides. A stiffness detection assembly 1 is provided, which can simultaneously perform stiffness testing on the joints where the two ends of the rod are welded to the wing plate 1807 to improve the detection efficiency. After the welding operation and the stiffness detection operation are completed, the double-axis cylinder 9 drives the rocker arms on both sides to fold in the opposite direction through the telescopic rod 10, and the positioning ball 4 is clamped and limited to the process hole 14 opened at the end of the rod. The pulley motor 17 is started again and the rod is driven to rotate and straighten through the roller 15, so that the wing plate 1807 is separated from the guide chute 8 on both sides of the side plate 7, and the assembled rod can be automatically discharged. The whole process is automated, which greatly improves the production efficiency.

[0022] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A production testing device, comprising a stiffness testing component (1), a swing arm (2) and a side plate (7), characterized in that: The stiffness detection assembly (1) comprises a control cylinder (101), a connecting pipe (102), an upper cavity (103), an upper piston (104), an abutment block (105), a lower cavity (106), a lower piston (107), a return spring (108), an adjustment screw (109) and a contact switch (110). The output end of the control cylinder (101) is fixedly connected to the connecting pipe (102), and the upper end of the U-shaped channel of the connecting pipe (102) is provided with an upper cavity (103), the upper piston (104) is slidably mounted inside the upper cavity (103), and the outer side of the upper piston (104) is fixedly connected to the abutment block (105), the lower end of the U-shaped channel of the connecting pipe (102) is provided with a lower cavity (106), and the lower piston (107) is slidably mounted inside the lower cavity (106), and the lower piston (107) is slidably mounted inside the lower cavity (106). The U-shaped channel between the lower piston (107) and the upper piston (104) is filled with hydraulic oil, and the lower piston (107) and the upper piston (104) are elastically connected to the inner walls of different sides of the connecting pipe (102) through the return spring (108), respectively. The inner wall of the lower cavity (106) close to the lower piston (107) is threadedly connected with an adjusting screw (109), and the adjusting screw (109) is located in the middle gap of the return spring (108) in the lower cavity (106), and the end of the adjusting screw (109) is connected to a contact switch (110). The side plate (7) is welded and fixed to the side end of the welding workbench (11), and the top of the welding workbench (11) is provided with a downwardly concave receiving concave surface (12), and the side of the welding workbench (11) is provided with a loading and unloading assembly (18), and a positioning assembly is provided on one side of the swing arm (2).

2. A production detection device according to claim 1, characterized in that: The stiffness detection component (1) is fixedly connected to the middle of the swing arm (2), and a switch housing (3) is fixed to one end of the outer side of the swing arm (2), a positioning ball (4) is embedded in the opening of the switch housing (3), and the positioning ball (4) is elastically connected to the bottom end of the switch housing (3) through a compression spring (5), and a proximity switch is arranged at the bottom end of the switch housing (3) for sensing the distance change of the positioning ball (4) and sending a switch signal.

3. A production detection device according to claim 2, characterized in that: A rotating pin (6) is fixed to one end of the inner side of the swing arm (2), and the rotating pin (6) is rotatably connected to two side edges of the side plate (7), and two downwardly recessed guiding inclined grooves (8) are provided on the top plane of the side plate (7).

4. A production detection device according to claim 3, characterized in that: A double-axis cylinder (9) is provided at the middle end of the root of the side plate (7), and telescopic rods (10) are fixedly connected to the output ends on both sides of the double-axis cylinder (9), and the output ends of the telescopic rods (10) are transmission-connected to the sliding grooves at the root of the swing arm (2).

5. A production detection device according to claim 3, characterized in that: The positioning assembly comprises a positioning ball (4) and a process hole (14); the receiving concave surface (12) receives a rod body (13) inside, and the end of the rod body (13) is provided with a process hole (14) that deviates from the center of a circle, and the plane at the end of the rod body (13) is in rolling cooperation with the positioning ball (4), and the process hole (14) at the end of the rod body (13) is embedded and positioned with the positioning ball (4).

6. A production detection device according to claim 5, characterized in that: Rollers (15) are rotatably mounted on both ends of the arc surface of the receiving concave surface (12), and the roller (15) at one end is coaxially driven with a corresponding pulley (16), and the pulley (16) is rotatably driven through a transmission belt and an output end of a pulley motor (17), and the pulley motor (17) is fixedly mounted on the bottom end of the welding workbench (11).

7. A production detection device according to claim 6, characterized in that: The loading and unloading assembly (18) comprises a bracket (1801), a guide bar (1802), a driving motor (1803), a sprocket (1804) and a chain (1805); the inner walls of the brackets (1801) on both sides are fixed with guide bars (1802) of an annular structure, and the outer wall of the bracket (1801) at one end is fixed with a driving motor (1803); the driving motor (1803) is connected to the sprocket (1804) through a gear set, and the input end sprocket (1804) is connected to the driven end sprocket (1804) through a chain (1805).

8. A production detection device according to claim 7, characterized in that: The loading and unloading assembly (18) further comprises an electromagnetic seat (1806), a wing plate (1807), a trigger terminal (1808) and a hinge (1809); the electromagnetic seat (1806) is hingedly connected to the chain (1805) at equal intervals, and the wing plate (1807) is magnetically fixed to the top plane of the electromagnetic seat (1806); the wing plate (1807) is attached to the outer edge of the rod body (13) through the guide inclined grooves (8) on both sides of the side plate (7) and is fixed by a welding robot arm. A trigger terminal (1808) is fixed to one end of the electromagnetic base (1806) close to the side plate (7), and the trigger terminal (1808) is in contact with a contact at a corresponding position on the welding workbench (11). A hinge (1809) is fixedly installed at the bottom of the electromagnetic base (1806), and the hinge (1809) is slidably matched with an annular structure guide bar (1802) on the inner wall of the bracket (1801), and the hinge (1809) is hingedly fixed to the chain (1805).

9. A rear guardrail assembly for an engineering vehicle, characterized in that: The rear guardrail assembly of the engineering vehicle is inspected using the production inspection device described in any one of claims 1 to 8.

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