A test device for simulating working conditions of the lifting hydraulic cylinder of a dump truck

Abstract

The present invention discloses a simulated working condition test device for a dump truck lifting hydraulic cylinder, which belongs to the technical field of hydraulic cylinders. A fixed bottom plate and a support IV are installed on the foundation; a support I is connected to the threaded hole of the fixed bottom plate; the support I is hinged to the cylinder pin of the tested hydraulic cylinder; the rear end of the loading compartment is hinged to the support IV, and a limited block is fixed at the lower position of the rear end of the loading compartment; a support II is connected to the threaded hole at the front end of the loading compartment; the support II is hinged to the piston rod sleeve pin of the tested oil cylinder; a return guide device is fixed to the lower side of the loading compartment, and a guide countersunk hole is opened on the foundation; uniformly distributed bolts II are fixed to the loading compartment, and load blocks are selectively installed on the bolts II. The present invention adjusts the number of load blocks to match the actual load, and simulates the relevant working conditions of the lifting cylinder to the maximum extent to test its extension sequence, jamming, cylinder pulling, shaking, oil leakage, service life and other related performances, which not only eliminates safety hazards but also greatly reduces related costs.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to a simulated working condition test device for a lifting hydraulic cylinder of a dump truck. Background Art

[0002] With the development of domestic economy, infrastructure construction is in the ascendant, and dump trucks are increasingly used in high-grade highway maintenance and earthwork projects. As a key component of dump trucks, the reliability of lifting hydraulic cylinders has attracted more and more attention from host customers, especially the simulated working condition test before its factory installation is a key step to test its performance.

[0003] At present, domestic dump truck lifting hydraulic cylinder manufacturers basically have no relevant testing methods, and most hydraulic cylinder test benches are in the factory test stage. The conventional practice is: the test device of the dump truck lifting cylinder is generally placed horizontally, the piston rod is extended along the axis direction, and the factory test is performed by retracting the device with an additional device.

[0004] The above test cannot verify the performance of the hydraulic cylinder under actual working conditions. Once a problem occurs during installation, the cost of disassembly, return to the factory and repair will be too high. In serious cases, the vehicle may be destroyed and people may die, posing a huge safety hazard. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a dump truck lifting hydraulic cylinder simulated working condition test device.

[0006] The present invention is realized through the following technical scheme: a dump truck lifting hydraulic cylinder simulated working condition test device, a fixed bottom plate and a support IV are installed on the foundation; a plurality of threaded holes distributed in a rectangular shape are opened on the fixed bottom plate, and the threaded holes of the fixed bottom plate are connected with the support I; the support I is hinged with the cylinder pin shaft of the tested hydraulic cylinder; the rear end of the loading carriage is hinged with the support IV, and a limit block matched with the support IV is fixed at the lower position of the rear end of the loading carriage; a plurality of threaded holes distributed in a rectangular shape are opened at the front end of the loading carriage, and the threaded holes at the front end of the loading carriage are connected with the support II; the support II is hinged with the piston rod sleeve pin shaft of the tested oil cylinder; a return guide device is fixed on the lower side of the loading carriage, and a guide countersunk hole matched with the return guide device is opened on the foundation; uniformly distributed bolts II are fixed on the loading carriage, and load blocks are selectively installed on the bolts II.

[0007] Further, the bolts II on the loading carriage are provided in two rows, and the two rows of bolts II are symmetrically arranged along the center line of the loading carriage.

[0008] The bolts II are arranged in pairs; the load block is a square block, and two through holes matching with the paired bolts II are opened on the center line of the load block.

[0009] The fixed base plate is fixed on the foundation by anchor bolts.

[0010] The support IV is fixed to the foundation by anchor bolts, and there are three supports IV in total; three supports III are fixed at the lower position of the rear end of the loading compartment, which are opposite to the support IV one by one, and the supports III are hinged to the supports IV one by one.

[0011] The return guide device is a cylinder perpendicular to the loading compartment.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The principle and structure are simple, the design and production cost is low, and the compatibility of the simulated working condition test device is high, which is suitable for most current lifting hydraulic cylinder product tests;

[0014] By setting two rows of variable loading loads, the eccentric load pressure can be set. By adjusting the number of load blocks to match the actual load, the loading test of the tested lifting hydraulic cylinder under fixed load can be realized, and the relevant working conditions of the lifting cylinder can be simulated to the maximum extent to test its extension sequence, jamming, cylinder pulling, shaking, oil leakage, service life and other related performances;

[0015] A limit block is installed at the bottom of the rear of the loading compartment. Combined with the installation height of the front support II of the loading compartment, it can prevent the piston rod of the tested hydraulic cylinder from running to the limit stroke, thus avoiding collision damage to internal parts.

[0016] A return guide device is installed at the bottom of the loading compartment, which cooperates with the guide countersunk holes in the foundation to simulate the accurate return of the loading compartment under eccentric load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the present invention;

[0018] Figure 2 is a top view of the present invention;

[0019] Figure 3 It is a left side view of the present invention;

[0020] Figure 4 yes Figure 1 Middle AA view;

[0021] In the figure: 1. foundation; 2. fixed base plate; 3. support I; 4. support II; 5. tested hydraulic cylinder; 6. loading carriage; 7. support III; 8. limit block; 9. support IV; 10. load block; 11. bolt II; 12. return guide device; 13. bolt II; 14. bolt III. DETAILED DESCRIPTION

[0022] The following is a specific embodiment of the present invention, and the present invention will be further described in conjunction with the accompanying drawings.

[0023] Combination Figures 1 to 4 As shown, a dump truck lifting hydraulic cylinder simulated working condition test device includes a tested hydraulic cylinder 5, a simulated installation stand and a loading device.

[0024] The simulated installation rig includes a foundation 1 and a loading carriage 6. The fixed base plate 2 is fixed to the foundation 1 by anchor bolts. The fixed base plate 2 is provided with a plurality of threaded holes in a rectangular distribution, and the threaded holes of the fixed base plate 2 are connected with support Ⅰ3. Support Ⅰ3 is hinged with the cylinder pin of the tested hydraulic cylinder 5. The front end of the loading carriage 6 is provided with a plurality of threaded holes in a rectangular distribution, and the threaded holes at the front end of the loading carriage 6 are connected with support Ⅱ4. Support Ⅱ4 is hinged with the piston rod sleeve pin of the tested oil cylinder 5, and the installation of the tested oil cylinder 5 completely simulates the installation form of the lifting oil cylinder on the dump truck. The threaded holes in a rectangular distribution on the fixed base plate 2 can adjust the position of support Ⅰ3 on the fixed base plate 2 and replace support Ⅰ3 with different pin hole sizes to match different lifting hydraulic cylinder cylinder pin sizes. The rectangularly distributed threaded holes at the front end of the loading carriage 6 can adjust the position of the support II 4 on the loading carriage 6 and replace the support II 4 with different pin shaft hole sizes to match the different lifting cylinder piston rod sleeve pin shaft sizes, so as to achieve the purpose of installing and testing most lifting hydraulic cylinders on the same simulation installation stand.

[0025] Support IV9 is fixed to the foundation 1 by anchor bolts, and there are three supports IV9 in total. Three supports III7 are fixed at the lower rear end of the loading compartment 6, which are opposite to the supports IV9 one by one. The supports III7 are hinged to the supports IV9 one by one. When the piston rod of the tested hydraulic cylinder 5 is extended, the loading compartment 6 is rotated and lifted around the hinge axis, which completely simulates the connection method of the dump truck compartment.

[0026] The loading device includes a load block 10 installed on the loading compartment 6. Two rows of bolts Ⅱ1 are fixed on the loading compartment 6, and the load block 10 is selectively installed on the bolt Ⅱ11. The two rows of bolts Ⅱ11 are symmetrically arranged along the center line of the loading compartment 6. The bolts Ⅱ11 are arranged in pairs, the load block 10 is square, and two through holes that cooperate with the paired bolts Ⅱ11 are opened on the center line of the load block 10. The maximum load weight of different dump trucks is simulated by adjusting the total load weight of the load block 10 placed in the loading compartment 6, and a certain eccentric load force is provided by setting the position of the load block 10 differently to maximize the simulation of the working conditions of the lifting cylinder of the dump truck; thereby accurately testing the extension sequence, jamming, cylinder pulling, shaking, oil leakage, service life and other related performance of the tested hydraulic cylinder 5.

[0027] A return guide device 12 is fixed to the lower side of the loading carriage 6. The return guide device 12 is a cylinder vertically welded to the loading carriage 6. A guide countersunk hole is provided on the foundation 1 to cooperate with the return guide device 12. In conjunction with the setting of the load block 10, the return guide device 12 can be used to detect the accurate return of the simulated loading carriage 6 under heavy load or unbalanced load.

[0028] The rear end of the loading carriage 6 is provided with a fixed limit block 8, which cooperates with the support IV 9. In combination with the installation height of the support II 4 at the front end of the loading carriage 6, the piston rod of the tested hydraulic cylinder 5 can be prevented from running to the limit stroke, thereby avoiding collision and damage to the internal parts of the tested hydraulic cylinder 5.

[0029] The simulated working condition test device in this embodiment is used for the simulation test of the dump truck lifting hydraulic cylinder before it leaves the factory for installation. It can simulate the installation form of the dump truck lifting hydraulic cylinder and the load it receives during the entire working cycle, and perform cyclic loading to test the reliability and service life of the lifting hydraulic cylinder under load conditions. At the same time, it can test various performance indicators such as the piston rod extension sequence, the minimum stable operating speed, and external leakage. By conducting a simulated working condition test before the lifting hydraulic cylinder leaves the factory, safety hazards are eliminated and related costs are greatly reduced.

Claims

1. A dump truck lifting hydraulic cylinder simulation working condition test device, Features: A fixed base plate (2) and a support IV (9) are installed on the foundation (1); the fixed base plate (2) is provided with a plurality of threaded holes distributed in a rectangular shape, and the threaded holes of the fixed base plate (2) are connected to the support I (3); the support I (3) is hingedly connected to the cylinder pin of the tested hydraulic cylinder (5); The rear end of the loading carriage (6) is hinged to the support IV (9), and a limit block (8) cooperating with the support IV (9) is fixed at a lower position of the rear end of the loading carriage (6); a plurality of threaded holes distributed in a rectangular shape are formed at the front end of the loading carriage (6), and the threaded holes at the front end of the loading carriage (6) are connected to the support II (4); the support II (4) is hinged to the piston rod sleeve pin of the tested hydraulic cylinder (5); A return guide device (12) is fixed to the lower side of the loading carriage (6), and a guide countersunk hole cooperating with the return guide device (12) is provided on the foundation (1); The loading carriage (6) is fixed with uniformly distributed bolts II (11), and a load block (10) is selectively installed on the bolts II (11); The bolts II (11) on the loading carriage (6) are provided in two rows, and the two rows of bolts II (11) are symmetrically arranged along the center line of the loading carriage (6); the bolts II (11) are arranged in pairs; the load block (10) is a square block, and two through holes matching the paired bolts II (11) are opened on the center line of the load block (10); The support IV (9) is fixed to the foundation (1) by anchor bolts, and a total of three supports IV (9) are provided; three supports III (7) are fixed at the lower position of the rear end of the loading carriage (6), and are opposite to the supports IV (9) one by one, and the supports III (7) are hinged to the supports IV (9) one by one; The return guide device (12) is a cylinder perpendicular to the loading compartment (6).

2. A dump truck lifting hydraulic cylinder simulated working condition test device according to claim 1, characterized in that: The fixed base plate (2) is fixed to the foundation (1) by means of anchor bolts.

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