Electric push rod load testing equipment

Abstract

The present invention relates to the field of push rod detection technology, specifically to an electric push rod load testing device. The present invention discloses an electric push rod load testing device, including a test bench, the test bench is provided with a sliding platform that can move linearly along the horizontal direction of the test bench, one end of the sliding platform is used to connect with the power output end of the electric push rod to be tested, the other end of the sliding platform is used to connect with a load mechanism, a sensor component is provided between the sliding platform and the power output end of the electric push rod to be tested, the load mechanism includes a screw rod and a magnetic powder brake component that is dynamically connected to the screw rod, the screw rod is threadedly connected to the sliding platform, and the screw rod is a non-self-locking screw rod that does not have a self-locking function. The present invention has the advantages of being able to ensure the accuracy of the test results while reducing the difficulty of equipment control and the overall cost.

Description

Technical Field

[0001] The invention relates to the technical field of push rod detection, in particular to an electric push rod load testing device. Background Art

[0002] A Chinese patent application with application number 202311781974.3 discloses a push rod push-pull force testing device, including a frame and a test control system. A push rod fixing mechanism, a linear guide mechanism, a load mechanism and a load control mechanism are arranged on the frame; the linear guide mechanism includes a mounting plate, a sliding assembly, and a connecting seat. The mounting plate is located on the outside of the push rod fixing seat. The mounting plate and the frame are movably connected through a sliding assembly. The connecting seat is fixed on the mounting plate, and the connecting seat is used to connect to the front end of the push rod to be tested; the load mechanism is connected to the mounting plate, and the load mechanism is a cylinder. The cylinder is installed under the mounting plate through a cylinder fixing seat. The load control mechanism provides an adjustable load force and thrust or pull force for the push rod to be tested through the load mechanism. The load control mechanism includes a pneumatic pressure switch, a pneumatic valve group, a pressure control knob, and a push-pull force knob.

[0003] In the above technical scheme, resistance is applied to the push rod to be tested by the cylinder and the load control mechanism in the load mechanism, so as to realize thrust test and tension test on the push rod to be tested. However, in the above technical scheme, the cylinder is used as the power source of the load, and the host computer is used to control the forward and backward movement of the mounting plate, so as to realize thrust test and tension test on the push rod to be tested. The cost is high, resulting in high overall cost of the test equipment. The whole test process is affected by the material or quality of the cylinder itself and cannot be accurately controlled. Professional electrical engineers are required to conduct inspections to ensure the accuracy of the test results, resulting in poor use effect of the equipment. Summary of the invention

[0004] The object of the present invention is to provide an electric push rod load testing device which can ensure the accuracy of the test result and reduce the difficulty of equipment control and the overall cost.

[0005] To achieve the above-mentioned purpose, the present invention discloses an electric push rod load testing device, including a test bench, wherein a sliding platform capable of moving linearly in a horizontal direction along the test bench is provided on the test bench, one end of the sliding platform is used to be connected to the power output end of the electric push rod to be tested, and the other end of the sliding platform is used to be connected to a load mechanism, a sensor component is provided between the sliding platform and the power output end of the electric push rod to be tested, the load mechanism includes a screw rod and a magnetic powder brake component dynamically connected to the screw rod, the screw rod is threadedly connected to the sliding platform, and the screw rod is a non-self-locking screw rod without a self-locking function.

[0006] When the electric push rod to be inspected is subjected to load test, the screw rod does not have the self-locking ability, so the screw rod cannot use the thread to self-lock. The thrust when the electric push rod is extended or the pulling force when it is shortened drives the sliding platform to move, and the thrust / pulling force is converted into torque, which in turn drives the screw rod to rotate. The magnetic powder brake assembly applies resistance to the screw rod through magnetic force, so that the sliding platform moves at a uniform speed. The sensor assembly is used to identify the thrust / pulling coefficient, so as to measure the voltage, current, pushing speed and other characteristics of the electric push rod under the set thrust / pulling conditions.

[0007] The present invention converts thrust / pull into torque to make the screw rod rotate, and uses the magnetic powder brake assembly to apply resistance to the screw rod through magnetic force, so that the sliding platform moves at a uniform speed. The electric push rod and the magnetic powder brake assembly are used as the main power and control elements. Compared with the use of complex cylinder control systems and host computers to control load tests, the accuracy of test results can be ensured; the hardware cost is lower, which helps to reduce the cost of the overall test equipment; and the operation and maintenance of the equipment are simpler. The operator does not need to have professional electrical engineering knowledge to perform load tests. The present invention has the advantages of ensuring the accuracy of the test results while reducing the difficulty of equipment control and the overall cost.

[0008] Preferably, the magnetic powder brake assembly comprises a magnetic powder brake and a control power supply electrically connected to the magnetic powder brake, and the spiral rod is dynamically connected to the magnetic powder brake.

[0009] The voltage of the magnetic powder brake is controlled by controlling the power supply, thereby changing the magnitude of the magnetic force applied by the magnetic powder brake to the spiral rod.

[0010] Compared with the method of using a cylinder as a load component, the way that the magnetic powder brake applies resistance to the spiral rod has the characteristics of fast response speed and high control accuracy, which can ensure that the resistance is applied more accurately during the test process, thereby improving the accuracy of the test results.

[0011] Preferably, the spiral rod passes through the center position of the lower side of the sliding platform along the moving direction of the test bench, and guide rail assemblies respectively located on both sides of the spiral rod are provided between the sliding platform and the test bench.

[0012] By arranging guide rail assemblies on both sides of the screw rod, the stability of the sliding platform moving along the axial direction of the screw rod is ensured, wherein the guide rail assembly can be any existing rod-shaped structure or convex strip-shaped structure parallel to the axial direction of the screw rod.

[0013] Preferably, the guide rail assembly includes a slider located at the lower side of the sliding platform and a guide rail fixed on the sliding platform, and the guide rail is provided with extension parts perpendicular to the moving direction of the test bench on both sides of the guide rail perpendicular to the moving direction of the sliding platform, and the slider cooperates with the guide rail.

[0014] The moving direction of the sliding platform is guided and limited by the cooperation between the guide rail with the extension part and the slider, so as to prevent the sliding platform from being subjected to the thrust from the power output end of the electric push rod to be inspected, which may cause the slider to be separated from the guide rail.

[0015] Preferably, a mounting seat is provided on the sliding platform, and the sensor component is arranged between the mounting seat and the power output end of the electric push rod to be inspected.

[0016] Since the installation position of the main body of the electric push rod to be inspected is fixed, the mounting seat serves as a transfer mounting mechanism, and the mounting seat can be adapted to the power output end of the electric push rod to be inspected of different shapes for installation.

[0017] Preferably, the mounting seat is an inverted T-shaped structure, which includes a horizontal bottom for mounting with the sliding platform and a vertical stop located on the upper side of the horizontal bottom, and the sensor assembly is mounted on the vertical stop.

[0018] The mounting seat is an inverted T-shaped structure. Compared with the upright mounting seat in the prior art, the horizontal bottom installed with the sliding platform can resist the overturning moment generated by the power output end of the electric push rod to be inspected on the vertical stop.

[0019] Preferably, the sensing assembly includes a force sensor, a first joint connected between the power output end of the electric push rod to be tested and the force sensor, and a second joint connected between the vertical stop and the force sensor, and the first joint and the second joint are connected to the force sensor by screws.

[0020] The force sensor is used to identify the thrust / pull coefficient, so as to measure the voltage, current, thrust speed and other characteristics of the electric actuator under the set thrust / pull conditions.

[0021] Preferably, the first joint and the second joint are both cylindrical structures, and the first joint and the second joint both include a large diameter portion and a small diameter portion, the large diameter portions of the first joint and the second joint are connected to the force sensor via screws, the small diameter portion of the first joint and the power output end of the electric push rod to be inspected are clamped and fixed by bolts, and the small diameter portion of the second joint is threadedly connected to the vertical stop portion.

[0022] With the first connector and the second connector located on both sides of the force sensor, it is convenient to assemble the electric push rod and the force sensor, and the sliding platform and the force sensor.

[0023] Preferably, the sliding platform is provided with a plurality of mounting holes for assembling the mounting seat, and the position of the mounting seat on the sliding platform is changed according to the position of the power output end of the electric push rod to be inspected, thereby improving adaptability.

[0024] Preferably, reinforcing ribs are provided on the side of the horizontal bottom and the vertical stop facing away from the sensor assembly, thereby ensuring the structural strength between the horizontal bottom and the vertical stop.

[0025] The present invention can make the sliding platform move at a uniform speed, and adopts an electric push rod and a magnetic powder brake assembly as the main power and control elements. Compared with the use of a complex cylinder control system and a host computer to control the load test, it has the advantages of ensuring the accuracy of the test results while reducing the difficulty of equipment control and the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the present invention after the electric push rod is loaded.

[0028] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0029] Figure 4 It is a structural schematic diagram of the sliding platform of the present invention.

[0030] Figure 5 It is a structural schematic diagram of the test bench of the present invention.

[0031] In the figure: 11, test bench; 111, bottom plate; 112, support frame; 113, load-bearing frame; 114, side plate; 12, guide rail; 13, bearing; 14, screw rod; 15, magnetic powder brake; 16, stand; 17, joint seat; 18, electric push rod; 20, sliding platform; 21, mounting hole; 22, connecting block; 23, slider; 24, mounting seat; 25, reinforcing rib; 30, force sensor; 31, first joint; 32, second joint. DETAILED DESCRIPTION

[0032] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0033] Depend on Figure 1 , Figure 5As shown, the present embodiment discloses a load testing device for an electric push rod 18, including a test bench 11, the test bench 11 includes a bottom plate 111, a support frame 112 symmetrically arranged on the bottom plate 111 along the width direction of the bottom plate 111, and a bearing frame 113 straddling the support frame 112 and having an inverted U-shaped cross-section along the length direction of the bottom plate 111, a vertical frame 16 is provided on the bottom plate 111 on one side of the bearing frame 113 in the horizontal direction, and a joint seat 17 for mounting with the electric push rod 18 to be tested is provided on the vertical frame 16, a sliding platform 20 capable of linearly moving along the horizontal direction of the test bench 11 is provided on the test bench 11, a mounting seat 24 is provided on the sliding platform 20, and the mounting seat 24 is an inverted T-shaped structure, and the inverted T-shaped structure includes a horizontal bottom for mounting with the sliding platform 20 and a vertical stop located on the upper side of the horizontal bottom, and a reinforcing rib 25 is provided on the side of the horizontal bottom and the vertical stop facing away from the sensor assembly, Figure 2 As shown, the sliding platform 20 is provided with a plurality of mounting holes 21 for assembling the mounting seat 24. The mounting seat 24 on the sliding platform 20 is used to be connected to the power output end of the electric push rod 18 to be tested. A sensor assembly is provided between the mounting seat 24 and the power output end of the electric push rod 18 to be tested. The lower end of the sliding platform 20 is provided with a connecting block 22 for connecting to a load mechanism. The load mechanism includes a screw rod 14 and a magnetic powder brake assembly dynamically connected to the screw rod 14. The axial ends of the screw rod 14 are rotatably connected to the carrier frame 113 through bearings 13. The screw rod 14 passes through the connecting block 22 along the moving direction of the test bench 11. The outer cylindrical surface of the screw rod 14 is threadedly connected to the connecting block 22. The lead of the screw rod 14 is greater than 10 mm, so that the screw rod 14 has no self-locking ability.

[0034] Depend on Figure 2 As shown, the magnetic powder brake assembly includes a magnetic powder brake 15 and a control power supply (not shown in the figure) electrically connected to the magnetic powder brake 15. The voltage of the magnetic powder brake 15 is controlled by the control power supply, thereby changing the magnetic force applied by the magnetic powder brake 15 to the spiral rod 14. The spiral rod 14 is dynamically connected to the magnetic powder brake 15.

[0035] Depend on Figure 4 As shown, a guide rail 12 assembly is provided between the sliding platform 20 and the test bench 11, which is respectively located on both sides of the screw rod 14. The guide rail 12 assembly includes four sliders 23 located on the lower side of the sliding platform 20 and a guide rail 12 fixed on the carrier frame 113. The guide rail 12 is fixed on the carrier frame 113 through the side plate 114. The four sliders 23 are divided into two groups along the axial direction of the screw rod 14. Each group of two sliders 23 are respectively arranged on both sides of the guide rail 12. The guide rail 12 is perpendicular to the sliding direction of the sliding platform 20 and is provided with extensions. The sliders 23 cooperate with the guide rail 12.

[0036] Depend on Figure 3As shown, the sensing assembly includes a force sensor 30, a first joint 31 connected between the power output end of the electric push rod 18 to be tested and the force sensor 30, and a second joint 32 connected between the vertical stop and the force sensor 30. The first joint 31 and the second joint 32 are both columnar structures, and the first joint 31 and the second joint 32 both include a large diameter portion and a small diameter portion. The large diameter portions of the first joint 31 and the second joint 32 are connected to the force sensor 30 by screws, the small diameter portion of the first joint 31 and the power output end of the electric push rod 18 to be tested are clamped and fixed by bolts, and the small diameter portion of the second joint 32 is threadedly connected to the vertical stop.

[0037] During assembly, the bottom of the electric push rod 18 is matched with the joint seat 17 on the stand 16, and the joint seat 17 and the bottom of the electric push rod 18 are clamped by bolts, the power output end of the electric push rod 18 and the small diameter portion of the first joint 31 are clamped by bolts, and the mounting seat 24 is installed with the small diameter portion of the second joint 32 through threads, and then according to the relative position of the mounting seat 24 above the sliding platform 20 at this time, the corresponding mounting hole 21 is selected and the mounting seat 24 is installed, so that the sliding platform 20 can adapt to electric push rods 18 of different shapes.

[0038] When the electric push rod 18 to be inspected is subjected to a load test, since the lead of the screw rod 14 is greater than 10 mm, the screw rod 14 cannot use the thread self-locking, and the thrust when the electric push rod 18 is extended or the pulling force when it is shortened drives the mounting seat 24 to move, thereby driving the sliding platform 20 to move, and the sliding platform 20 moves along the guide rail 12 through the slider 23. The connecting block 22 on the lower side of the sliding platform 20 converts the thrust / pulling force into torque, thereby driving the screw rod 14 to rotate. In this process, the magnetic powder brake 15 uses magnetic force to A resistance is applied to the screw rod 14, and the voltage of the magnetic powder brake 15 is controlled by the control power supply, thereby changing the magnetic force applied by the magnetic powder brake 15 to the screw rod 14, and then the sliding platform 20 moves at a uniform speed. When the sliding platform 20 moves at a low speed and uniform speed, the first joint 31 and the second joint 32 squeeze the force sensor 30, and the force sensor 30 converts it into an electrical signal, thereby identifying the thrust / pull coefficient and measuring the voltage, current, pushing speed and other characteristics of the electric push rod 18 under the set thrust / pull conditions.

Claims

1. An electric push rod load testing device, comprising a test bench, wherein a sliding platform capable of linearly moving along the horizontal direction of the test bench is provided on the test bench, wherein one end of the sliding platform is used to be connected to the power output end of the electric push rod to be tested, and the other end of the sliding platform is used to be connected to a load mechanism, and a sensor component is provided between the sliding platform and the power output end of the electric push rod to be tested, wherein: The load mechanism comprises a screw rod and a magnetic powder brake assembly dynamically connected to the screw rod. The screw rod is threadedly connected to the sliding platform. The screw rod is a non-self-locking screw rod without a self-locking function.

2. The electric push rod load testing device according to claim 1, characterized in that: The magnetic powder brake assembly comprises a magnetic powder brake and a control power supply electrically connected to the magnetic powder brake, and the spiral rod is dynamically connected to the magnetic powder brake.

3. An electric push rod load testing device according to claim 1 or 2, characterized in that: The spiral rod passes through the center position of the lower side of the sliding platform along the moving direction of the test bench, and guide rail components respectively located on both sides of the spiral rod are arranged between the sliding platform and the test bench.

4. The electric push rod load testing device according to claim 3, characterized in that: The guide rail assembly includes a slider located at the lower side of the sliding platform and a guide rail fixed on the sliding platform. The guide rail is perpendicular to the sliding direction of the sliding platform and has extensions perpendicular to the moving direction of the test bench on both sides thereof. The slider cooperates with the guide rail.

5. The electric push rod load testing device according to claim 1, characterized in that: The sliding platform is provided with a mounting seat, and the sensor assembly is arranged between the mounting seat and the power output end of the electric push rod to be inspected.

6. The electric push rod load testing device according to claim 5, characterized in that: The mounting seat is an inverted T-shaped structure, which includes a horizontal bottom for mounting with the sliding platform and a vertical stopper located on the upper side of the horizontal bottom, and the sensor assembly is mounted on the vertical stopper.

7. The electric push rod load testing device according to claim 5 or 6, characterized in that: The sensing assembly includes a force sensor, a first joint connected between the power output end of the electric push rod to be tested and the force sensor, and a second joint connected between the vertical stop and the force sensor. The first joint and the second joint are connected to the force sensor via screws.

8. The electric push rod load testing device according to claim 7, characterized in that: The first joint and the second joint are both cylindrical structures, and the first joint and the second joint both include a large diameter portion and a small diameter portion. The large diameter portions of the first joint and the second joint are connected to the force sensor through screws, the small diameter portion of the first joint and the power output end of the electric push rod to be inspected are clamped and fixed by bolts, and the small diameter portion of the second joint is threadedly connected to the vertical stop portion.

9. An electric push rod load testing device according to claim 1, 5 or 6, characterized in that: The sliding platform is provided with a plurality of mounting holes for assembling the mounting seat.

10. The electric push rod load testing device according to claim 6, characterized in that: The horizontal bottom and the vertical stop are provided with reinforcing ribs on one side facing away from the sensor assembly.

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