A jack test bench

Abstract

The present invention discloses a jack test bench, which belongs to the field of jack testing technology and includes a gantry, a lifting beam and a driving assembly. The gantry includes a base, two columns and a top beam, and the columns are provided with a plurality of first latch holes along the height direction. An actuator, a latch and a second latch hole are respectively provided at both ends of the lifting beam. The second latch hole is formed inside the lifting beam and can be arranged opposite to the first latch hole. The moving stroke of the latch is limited to the inside of the channel formed when the first latch hole is connected to the second latch hole. The test bench drives the lifting beam up and down in the gantry through the driving assembly. When the lifting beam is lifted to the set position, the actuator can be used to drive the latch to extend so that the latch is limited to the first latch hole and the second latch hole, thereby converting the internal force of the lifting beam into the internal force of the two columns, significantly reducing the force on the screw rod, effectively protecting the screw rod structure, and providing anti-fall protection during the loading process.

Description

Technical Field

[0001] The invention belongs to the technical field of jack testing, in particular to a jack test bench. Background Art

[0002] Jacks, as tools for lifting heavy objects, are widely used in engineering machinery, building construction, and bridge maintenance. To ensure the jack's operational stability, safety, and service life, they undergo a variety of performance tests, including those for load-bearing capacity, hydraulic performance, durability, and sealing. A jack test bench is a specially designed device for testing various jack performance parameters. By dynamically loading the jack, data on compression resistance, deformation, and sealing are collected.

[0003] A conventional jack test rig consists of a gantry, a drive assembly, and a loading mechanism. The drive assembly drives the loading mechanism along a predetermined path on the gantry, thereby applying a load to the jack located at its base. The jack test rig's automated loading simulation comprehensively simulates the jack's operating conditions under load.

[0004] However, due to the high load capacity of some large jacks, the required test bench size also increases. In jack test benches capable of carrying loads exceeding hundreds of tons, the loading mechanism itself is quite heavy. Coupled with the test bench's lack of safety measures and protection mechanisms, this poses many safety risks. For example, the drive assembly used to drive and support the loading mechanism is repeatedly subjected to forces from both the upper and lower directions of the loading mechanism (the positive force or bending moment generated by the loading mechanism's gravity when the loading mechanism is unloaded, and the reverse force or bending moment generated by the reverse action of the jack on the loading mechanism during loading). This can cause the drive assembly to fail, leading to a safety accident resulting in the loading mechanism falling. Utility Model Content

[0005] The object of the present invention is to provide a jack test bench to solve the problems raised in the above-mentioned prior art.

[0006] A jack test bench is provided, comprising:

[0007] The gantry comprises a base, two columns and a top beam, wherein the base and the top beam are fixedly connected via the two columns, and the columns are provided with a plurality of first latch holes along a height direction;

[0008] A lifting beam, the lifting beam being located between two upright columns, with limit assemblies provided at both ends of the lifting beam, the limit assemblies comprising an actuator, a latch, and a second latch hole; a cylinder of the actuator being fixedly connected to the lifting beam, and an output shaft of the actuator being fixedly connected to the latch; the second latch hole being formed within the lifting beam and being arranged opposite to the first latch hole; a travel of the latch being limited to an interior of a channel formed when the first latch hole is connected to the second latch hole;

[0009] A driving assembly is used to drive the lifting beam to move along the height direction of the column.

[0010] As a further aspect of the present invention, the drive assembly includes a motor, a transmission assembly, two screws, and two nut assemblies. The motor is connected to the screws via the transmission assembly, and each end of the lifting beam is connected to a corresponding screw via a nut assembly. The two screws are arranged on either side of the gantry. The motor, via the transmission assembly, drives the two screws to rotate synchronously, which in turn drives the lifting beam via the two nut assemblies, thus avoiding interference between the ends of the lifting beam and the screws due to asynchronous travel.

[0011] As a further embodiment of the present invention, the transmission assembly includes a bidirectional reducer, two synchronous shafts, and two commutators. The motor is connected to the two synchronous shafts via the two output shafts of the bidirectional reducer. The two synchronous shafts extend within the top beam toward the ends of the top beam and are connected to corresponding screws via commutators. The bidirectional reducer has two output shafts that respectively drive the two synchronous shafts to rotate, thereby increasing the output torque. The commutator is used to change the torque output direction of the synchronous shafts, arranging them perpendicular to the screws and concealing them within the top beam, fully utilizing the gantry space.

[0012] As a further aspect of the present invention, the nut assembly comprises a working nut and a safety nut threadedly connected to the screw from top to bottom. The working nut and safety nut are mutually restrained and spaced a certain distance apart by toothed bosses and toothed grooves. When the working nut and screw are functioning normally, the working nut bears the load, while the safety nut, restrained by its teeth, moves synchronously with the working nut on the screw. If the working nut fails due to wear, the safety nut takes over and bears the load, ensuring that the working nut, worn out, will not suffer structural failure at the nut level, leading to a safety hazard such as a fall.

[0013] As a further aspect of the present invention, a detection switch is provided between the working nut and the safety nut. When the working nut wears and gradually falls, the detection switch senses that the distance between the working nut and the safety nut has reached a safety warning distance, thereby generating an alarm to warn that the working nut needs to be replaced, eliminating the need for visual observation of the distance between the working nut and the safety nut.

[0014] As a further aspect of the present invention, the lifting beam and the nut assembly are connected via a floating spring seat. The elastic action of the floating spring seat allows the lifting beam to float vertically relative to the nut assembly. The floating spring seat provides a flexible connection between the lifting beam and the nut assembly. When the lifting beam is subjected to a reverse force, the deformation of the floating spring seat significantly reduces the internal stress borne by the nut assembly from the lifting beam, transferring nearly all of the internal stress to the column, thereby protecting the screw rod.

[0015] As a further feature of the present invention, the front edge of the latch pin's output is chamfered. This chamfer allows the latch pin to adapt to the position of the first latch pin hole, allowing it to slide naturally into the first latch pin hole without interference. Furthermore, even if there is a positioning error between the latch pin and the first latch pin hole, the floating spring seat's upward and downward movement prevents interference and prevents mating.

[0016] As a further solution of the present invention: the floating spring seat includes a connecting plate, a plurality of springs and a plurality of support rods, the connecting plate is fixedly connected to the nut assembly, and the plurality of support rods movably pass through the connecting plate, one end of the support rod is fixedly connected to the lifting beam and the other end is provided with a limiting block, the spring is clamped between the lifting beam and the connecting plate, and the spring is clamped between the connecting plate and the limiting block.

[0017] As a further aspect of the present invention, at least three structurally opposed surfaces are formed between one end of the lifting beam and the column, and the lifting beam is provided with a plurality of guide wheels that contact each of the structurally opposed surfaces on the column. The guide wheels provide guidance and position control between the lifting beam and at least three sidewalls of the column, ensuring stable vertical operation of the lifting beam and preventing lateral forces from acting on the lead screw.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The test bench drives the lifting beam up and down in the gantry through the drive assembly. When the lifting beam is lifted to the set position, the actuator can drive the pin to extend so that the pin is limited to the first pin hole and the second pin hole. At this time, the loading process of the lifting beam converts the internal force of the lifting beam into the internal force of the two columns, which significantly reduces the force on the screw rod, effectively protects the screw rod structure, and provides anti-fall protection during the loading process.

[0020] 2. Because the columns have multiple first latch holes at different heights, the lifting beam can be roughly adjusted in height before establishing latch stops with the first latch holes at the corresponding heights. Fine adjustment is then performed by extending the oil cylinder on the loading end of the lifting beam to contact the jack, providing a secure locking function at any height. During testing, the forces between the lifting beam and the jack are converted into internal forces within the gantry, eliminating direct test pressure on the ground and effectively protecting the ground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 The figure is a schematic diagram of the overall structure of a jack test bench;

[0023] Figure 2 A diagram showing the matching structure of the latch and the latch hole provided by the present invention;

[0024] Figure 3 A partial structural cross-sectional view of the gantry provided by the present invention;

[0025] Figure 4 Schematic diagram of the coordination structure between the lifting beam and the floating spring seat;

[0026] Figure 5 for Figure 4 Enlarged view of area A in the middle;

[0027] Figure 6 This is an assembly structure diagram of the guide wheel provided by the present invention.

[0028] In the figure: 1. Gantry; 11. Base; 12. Column; 121. First latch hole; 13. Top beam; 2. Lifting beam; 211. Actuator; 212. Latch; 213. Second latch hole; 22. Guide wheel; 3. Drive assembly; 31. Motor; 32. Transmission assembly; 321. Bidirectional reducer; 322. Synchronous shaft; 323. Commutator; 33. Screw; 34. Nut assembly; 341. Working nut; 342. Safety nut; 4. Floating spring seat; 41. Connecting plate; 42. Spring; 43. Support rod; 431. Limit block. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0030] Obviously, the drawings described below are merely examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without inventive effort. Furthermore, it is understood that while the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the disclosure of the present invention, any design, manufacturing, or production changes based on the technical content disclosed in the present invention are merely conventional technical means and should not be construed as an inadequacy of the disclosure of the present invention.

[0031] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of substantially identical structures may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Furthermore, the drawings and the following description are provided to facilitate a thorough understanding of the present invention by those skilled in the art and are not intended to limit the subject matter recited in the claims.

[0032] See also Figure 1-2 As shown, in an embodiment of the present invention, a jack test bench includes a gantry 1, a lifting beam 2, and a drive assembly 3. The gantry 1 includes a base 11, two columns 12, and a top beam 13. The base 11 and top beam 13 are fixedly connected by the two columns 12. The columns 12 are provided with a plurality of first latch holes 121 along the height direction. The lifting beam 2 is located between the two columns 12. A limit assembly is provided at each end of the lifting beam 2. The limit assembly includes an actuator 211, a latch 212, and a second latch hole 213. The cylinder of the actuator 211 is fixedly connected to the lifting beam 2, and the output shaft of the actuator 211 is fixedly connected to the latch 212. The second latch hole 213 is formed within the lifting beam 2 and is arranged opposite the first latch hole 121. The travel range of the latch 212 is limited to the channel formed when the first latch hole 121 and the second latch hole 213 are connected. The drive assembly 3 is used to drive the lifting beam 2 to move along the height direction of the columns 12.

[0033] The gantry 1 forms a frame structure through a base 11, two columns 12 and a top beam 13. The two columns 12 are located at the two ends of the base 11 and the top beam 13 respectively. The jack is placed on the base 11 for testing, so that the force during the test is converted into the internal force of the gantry 1, and no pressure is directly applied to the ground, thereby protecting the ground structure from damage.

[0034] During testing, the drive assembly 3 drives the lifting beam 2 along the height of the column 12, and the lifting height of the lifting beam 2 is controlled according to the size of the jack. Because the first latch hole 121 on the column 12 is intermittent, the lifting and lowering of the lifting beam 2 is a rough adjustment. After reaching the desired position, the actuator 211 drives the latch 212 to extend from the second latch hole 213. The latch 212 stops between the first latch hole 121 and the second latch hole 213 and acts as a shear pin, providing support for the lifting beam 2. This ensures that the driving assembly 3 is not subjected to force when the lifting beam 2 is loaded. Instead, the force is converted into internal force of the gantry 1, preventing the lifting beam 2 from falling and causing a safety accident due to failure of the driving assembly 3. A cylinder is installed at the middle loading end of the lifting beam 2. After the lifting height of the lifting beam 2 is roughly adjusted, the cylinder extends its output end to load the jack. A pressure sensor is installed at the front end of the cylinder output, which can output pressure data in real time.

[0035] Specifically, see Figure 1 and Figure 3 As shown, the drive assembly 3 includes a motor 31, a transmission assembly 32, two screw rods 33, and two nut assemblies 34. The two screw rods 33 are located on either side of the gantry 1. The ends of the lifting beam 2 are threadedly connected to the screw rods 33 via the nut assemblies 34. When the motor 31 is turned on, the transmission assembly 32 drives the screw rods 33 on both sides to rotate, thereby driving the lifting beam 2 up and down.

[0036] The transmission assembly 32 includes a bidirectional reducer 321, two synchronous shafts 322 and two commutators 323. The bidirectional reducer 321 has two output shafts, which are used to reduce the input speed of the motor 31 and increase the torque to be output from the two output shafts respectively. The commutator 323 has a gear assembly inside, which changes the output direction of the torque through the transmission of the gears. The two output shafts of the bidirectional reducer 321 respectively drive the two synchronous shafts 322 to rotate, and the synchronous shaft 322 drives the screw rod 33 to rotate after changing the direction of the torque through the commutator 323, thereby realizing that one motor 31 drives the two screw rods 33 to rotate synchronously. The entire transmission part is limited to the top beam 13 structure, and does not occupy additional space on the gantry 1, thus retaining the lifting height of the lifting beam 2 to the greatest extent.

[0037] See also Figure 3-Figure 5As shown, the nut assembly 34 includes a working nut 341 and a safety nut 342, which are threadedly connected to the screw rod 33 from top to bottom. The working nut 341 is positioned higher than the safety nut 342 on the screw rod 33. The working nut 341 and the safety nut 342 are mutually restrained by a toothed boss and a toothed groove, and are separated by a predetermined distance. Under normal use, the working nut 341 supports the lifting beam 2, and when the working nut 341 rotates under the action of the thread, the toothed groove and the toothed boss restrain the safety nut 342, which rotates and raises the lifting beam 2 synchronously. At the same time, the safety nut 342 is prevented from rotating on its own due to the restraining action of the toothed groove and the toothed boss. When the working nut 341 settles relative to the screw rod 33 due to wear, the gap between the working nut 341 and the safety nut 342 decreases. The gap distance can be observed to determine whether the working nut 341 needs to be replaced. In addition, if the working nut 341 suddenly fails in structure, the lifting beam 2 and the working nut 341 are mounted on the safety nut 342 as a whole, and the threaded structure of the safety nut 342 continues to maintain the lifting beam 2 to prevent it from falling, thereby playing an anti-fall protection role.

[0038] Furthermore, a detection switch is provided between the working nut 341 and the safety nut 342. The detection switch can utilize a pressure sensor, a photoelectric sensor, a proximity switch, or the like to detect the distance between the working nut 341 and the safety nut 342, thereby determining the degree of wear on the working nut 341 and whether the working nut 341 needs to be replaced. The detection switch can be connected to an alarm, which sounds when the detection switch is triggered, prompting staff to inspect and repair the working nut 341.

[0039] The lifting beam 2 and the nut assembly 34 are connected via a floating spring seat 4. The floating spring seat 4 is elastic, forming a soft connection between the lifting beam 2 and the nut assembly 34. When the lifting beam 2 is in a lifting state, the lifting beam 2 presses on the floating spring seat 4, and the floating spring seat 4 is in a compressed state. When the lifting beam 2 forms a hard connection with the column 12 through the latch 212, the column 12, which is the floating spring seat 4, bears part of the gravity of the lifting beam 2. When the lifting beam 2 is loaded, the lifting beam 2 is subjected to the reverse force of the jack, and the floating spring seat 4 changes from a compressed state to a state with a tendency to release the compressive force. However, due to the large degree of compression deformation of the floating spring seat 4, the lifting beam 2 is almost invisible. Therefore, the reverse force of the lifting beam 2 will not cause a reverse action between the nut assembly 34 and the screw rod 33. The internal force of the lifting beam 2 during loading is all transmitted to the column 12, forming a protection for the screw rod 33.

[0040] Furthermore, the floating spring seat 4 comprises a connecting plate 41, a plurality of springs 42, and a plurality of support rods 43. The connecting plate 41 is fixedly connected to the nut assembly 34, specifically to the working nut 341 within the nut assembly 34. A plurality of support rods 43 flexibly extend through the connecting plate 41. One end of each support rod 43 is fixedly connected to the lifting beam 2, and the other end is provided with a limit block 431. The springs 42 are clamped between the lifting beam 2 and the connecting plate 41, and between the connecting plate 41 and the limit block 431, respectively. When the nut assembly 34 and the connecting plate 41 are stationary, the lifting beam 2 can float up and down due to the springs 42 on either side of the connecting plate 41.

[0041] The spring 42 on the upper side of the connecting plate 41 is in a compressed state, while the spring 42 on the lower side of the connecting plate 41 is in a tensile state. The springs 42 on both sides balance the pressure on the lifting beam 2, reducing the load on the springs 42 on each side. By providing springs 42 on both sides of the connecting plate 41, the distance between the lifting beam 2 and the connecting plate 41 can be shortened without affecting the floating travel of the lifting beam 2. This, in turn, reduces the height of the spring 42 on the upper side of the connecting plate 41, preventing the upper spring 42 from increasing in deflection due to excessive height, improving the stability of the spring 42 structure, and reducing the risk of the lifting beam 2 tipping over.

[0042] The latch 212 and the first latch hole 121 have a clearance fit, and the optimal fit is a close fit with a clearance approaching zero, ensuring that the internal force of the lifting beam 2 is fully transmitted to the column 12. However, because the lifting height of the lifting beam 2 is affected by transmission accuracy, it is not possible to guarantee that the landing point of the latch 212 will always precisely align with the first latch hole 121, resulting in interference caused by errors. Therefore, the output front edge of the latch 212 is chamfered. Once the chamfer contacts the edge of the first latch hole 121, the latch 212 slides naturally into the first latch hole 121 due to the inclined chamfered surface, thus resolving the interference caused by errors. Furthermore, because the lifting beam 2 has an up and down floating travel due to the floating spring seat 4, the chamfered latch 212 engages the first latch hole 121, causing the lifting beam 2 to float, thereby achieving an adaptive fit between the lifting beam 2 and the first latch hole 121.

[0043] See also Figure 3 and Figure 6 As shown, there are at least three structural facing surfaces between one end of the lifting beam 2 and the column 12, that is, the lifting beam 2 forms at least three structural surrounding surfaces around the column 12. The lifting beam 2 is provided with a number of guide wheels 22 on these three structural surfaces. The guide wheels 22 contact the column 12 to ensure stable lifting of the lifting beam 2 and prevent lateral vibration of the lifting beam 2, which could cause lateral forces on the screw rod 33.

[0044] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the present invention, other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A jack test bench, characterized in that: include: A gantry (1) comprising a base (11), two columns (12) and a top beam (13), wherein the base (11) and the top beam (13) are fixedly connected via the two columns (12), and the columns (12) are provided with a plurality of first latch holes (121) along a height direction; A lifting beam (2), the lifting beam (2) is located between two upright columns (12), and limit assemblies are respectively provided at both ends of the lifting beam (2), the limit assemblies comprising an actuator (211), a latch (212), and a second latch hole (213), the cylinder of the actuator (211) is fixedly connected to the lifting beam (2), and the output shaft of the actuator (211) is fixedly connected to the latch (212), the second latch hole (213) is formed inside the lifting beam (2) and can be arranged opposite to the first latch hole (121), and the moving stroke of the latch (212) is limited to the inside of a channel formed when the first latch hole (121) and the second latch hole (213) are connected; A drive assembly (3), the drive assembly (3) is used to drive the lifting beam (2) to move along the height direction of the column (12), the drive assembly (3) comprising a motor (31), a transmission assembly (32), two screw rods (33) and two nut assemblies (34), the motor (31) being connected to the screw rods (33) via the transmission assembly (32), and both ends of the lifting beam (2) being connected to the corresponding screw rods (33) via the nut assemblies (34); The lifting beam (2) and the nut assembly (34) are connected via a floating spring seat (4), and the lifting beam (2) has an up and down floating stroke relative to the nut assembly (34) in the height direction due to the elastic action of the floating spring seat (4); The floating spring seat (4) includes a connecting plate (41), a plurality of springs (42) and a plurality of support rods (43), wherein the connecting plate (41) is fixedly connected to the nut assembly (34), and the plurality of support rods (43) movably penetrate the connecting plate (41), one end of the support rod (43) is fixedly connected to the lifting beam (2) and the other end is provided with a limit block (431), the spring (42) is clamped between the lifting beam (2) and the connecting plate (41), and the spring (42) is clamped between the connecting plate (41) and the limit block (431).

2. A jack test bench according to claim 1, characterized in that: The transmission assembly (32) includes a bidirectional reducer (321), two synchronous shafts (322), and two commutators (323). The motor (31) is respectively connected to the two synchronous shafts (322) through the two output shafts of the bidirectional reducer (321). The two synchronous shafts (322) extend toward the two ends of the top beam (13) in the top beam (13). The two synchronous shafts (322) are respectively connected to the corresponding screw rods (33) through the commutators (323).

3. The jack test bench according to claim 1, characterized in that: The nut assembly (34) comprises a working nut (341) and a safety nut (342) threadedly connected to the screw rod (33) from top to bottom, wherein the working nut (341) and the safety nut (342) are mutually limited by a toothed boss and a toothed groove and are spaced a certain distance apart.

4. A jack test bench according to claim 3, characterized in that: A detection switch is provided between the working nut (341) and the safety nut (342).

5. The jack test bench according to claim 1, characterized in that: The output front end edge of the latch (212) is provided with a chamfer.

6. The jack test bench according to claim 1, characterized in that: There are at least three structural opposing surfaces between one end of the lifting beam (2) and the column (12), and a plurality of guide wheels (22) are provided on the lifting beam (2) and are respectively in contact with each structural opposing surface on the column (12).

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