Clutch lowering speed control test device and test method thereof
By designing a clutch release speed control test device including a reel, hydraulic and control components, the existing test equipment solves the problems of difficulty and low accuracy in the clutch release speed control test, and achieves high-precision test results and clutch The accuracy of component design parameters is improved, reducing the design cycle and production costs.
Patent Information
- Application Number
- CN202411376544.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-21
AI Technical Summary
When performing the speed control test of the hoist clutch of the hoist clutch, the existing clutch de-loading test equipment has problems such as high testing difficulty, low test accuracy, and lack of test basis for clutch parts operation, resulting in long clutch design cycle, high component production cost or low component quality.
Design a clutch lowering speed control test device, including a drum assembly, a hydraulic assembly and a control assembly. The drum is driven by the falling weight to rotate, and the hydraulic assembly is used to adjust the clutch oil pressure to achieve controlled free fall and full release of the heavy object. Free fall mode speeds, collect the dynamic oil pressure and torque values of the clutch, and establish a clutch pressure-reel speed-input torque database.
It improves the difficulty of the test process of the test device and the high accuracy of the test results, improves the accuracy of the design parameters of the clutch components, reduces the design cycle and production costs, and improves the safety and economy of the entire vehicle system.
Smart Images
Figure CN119334636A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of casting clutches, and in particular to a clutch lowering speed control test device and a test method thereof. Background Art
[0002] The clutch is a common component in mechanical transmission, which can separate or engage the transmission system at any time. The basic requirements for it are: smooth engagement, quick and thorough separation. The winch clutch is composed of several parts, including friction plate, pressure plate, spring, clutch housing, etc. When the clutch is engaged, the distance between the clutch housing and the friction plate will increase. At this time, the friction plate will not be pressed on the pressure plate, and the winch can rotate freely. When the clutch is connected, the clutch housing moves toward the pressure plate, compacting the friction plate, so that the power is transmitted to the winch.
[0003] Existing clutch products can be applied to various types of winches. The main application scenarios include but are not limited to crawler crane equipment for various operations such as suspended double-wheel milling, suspended grab, and rammer. The clutch of the above winches not only needs to meet the basic needs of the winch, but also requires free fall functions in two modes: "controllable free fall" and "full release free fall", and random switching of the two modes is required according to working conditions. The lowering of heavy objects in the above two functional modes must be achieved through the clutch products in the winch. That is, the clutch needs to have a speed control function.
[0004] In order to ensure that the factory settings of the products meet the functional requirements of the market, existing clutch manufacturers need to study the test methods of automatic speed control / free lowering of clutch products to improve safety and reliability while ensuring product functions. It is also necessary to ensure that the clutch is at normal oil pressure and working temperature during the lowering process so that the clutch components can operate normally and avoid abnormal oil pressure and oil temperature, which will cause early wear of the components and affect the service life of the clutch. However, during the clutch lowering speed control test stage, existing clutch manufacturers can only study the fixed lowering speed of the clutch. For the autonomous speed control test under the random switching of the two modes according to the working conditions, the existing test equipment has a decrease in the accuracy of the test results and the safety of the test when the lowering speed changes. In addition, the existing test equipment also lacks test basis for the operation of components, which makes the accuracy of the design parameters of the clutch components easy to be too high or too low, which not only leads to a long design cycle of the existing clutch, but also makes the production cost of the clutch components high or the quality of the components low. In addition, for different specifications of winches with different usage requirements, it will further increase the difficulty of clutch design and increase the design cycle. Therefore, a clutch lowering speed control test device is urgently needed to solve the problems of high test difficulty, low test result accuracy, lack of test basis for clutch component operation, long clutch design cycle, high component production cost or low component quality when the existing clutch lowering test equipment is used to conduct a winch clutch lowering speed control test. Summary of the invention
[0005] The object of the present invention is to provide a clutch lowering speed control test device and a test method thereof 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 clutch lowering speed control test device, comprising a test frame, a test assembly and a clutch, the test assembly comprising a drum assembly, a hydraulic assembly and a control assembly; the drum assembly is installed at the bottom of the test frame, and is provided with a drum and a wire rope sleeved on the drum, a weight is connected to the end of the wire rope, the weight is installed on the test frame through a sliding wheel, and the weight falls to drive the drum to rotate; the clutch shaft of the clutch is connected to the power shaft of the drum; the power output end of the hydraulic assembly is connected to the clutch; the control assembly comprises a controller and a data acquisition assembly, the data acquisition assembly comprises a plurality of sensors for collecting data including the working oil pressure value of the clutch, the drum speed value and the torque value of the clutch; the controller is electrically connected to the hydraulic assembly to adjust the clutch to control the lowering speed of the weight.
[0007] Preferably, one end of the power shaft of the reel is connected to a hydraulic motor for driving the reel to rotate and lift the heavy object to the top of the test frame, and the other end of the power shaft is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the clutch shaft of the clutch; a speed sensor is installed on the power shaft side of the reel, and a torque sensor is connected to the clutch shaft of the clutch, and the speed sensor and the torque sensor are electrically connected to the controller respectively; the speed sensor is an absolute encoder.
[0008] Preferably, the hydraulic component includes a hydraulic pump component, a clutch control valve group, connecting pipelines and a hydraulic oil tank; the hydraulic pump component includes a hydraulic pump and a hydraulic pump drive motor, and the power end of the hydraulic pump drive motor is connected to the hydraulic pump input shaft; the clutch control valve group includes a clutch output valve, a speed control valve and a proportional pressure reducing valve; the hydraulic pump is connected to the clutch output valve, the speed control valve, the proportional pressure reducing valve, the clutch and the hydraulic oil tank in sequence through connecting pipelines to form a clutch drive oil circuit.
[0009] Preferably, a system pressure solenoid valve is provided between the hydraulic pump power output end and the hydraulic oil tank of the clutch drive oil circuit, which is used to adjust the output pressure of the hydraulic pump; the clutch output valve is a three-position four-way valve, and a filter is also connected between the clutch output valve and the speed control valve; an overflow valve is installed on the clutch drive oil circuit, which is used to set the maximum working oil pressure of the clutch; the clutch output valve, the proportional pressure reducing valve and the system pressure solenoid valve are electrically connected to the controller respectively.
[0010] Preferably, a clutch control valve is connected in parallel between the proportional pressure reducing valve and the hydraulic oil tank, and the clutch control valve is a two-position two-way valve; the input end of the clutch control valve is connected to the oil circuit between the clutch and the proportional pressure reducing valve through a connecting pipeline, and the output end is connected to the clutch cooling oil channel through a connecting pipeline to form a clutch cooling oil circuit for cooling the clutch, and the return oil channel of the clutch cooling oil channel is connected to the hydraulic oil tank through a connecting pipeline; the clutch control valve is electrically connected to the controller.
[0011] Preferably, a system oil pressure sensor and a clutch oil pressure sensor are provided on the clutch drive oil circuit; the system oil pressure sensor is installed at the power output end of the hydraulic pump to monitor the system pressure value; the clutch oil pressure sensor is installed at the input end side of the proportional pressure reducing valve to monitor the working oil pressure value of the clutch; the system oil pressure sensor and the clutch oil pressure sensor are electrically connected to the controller respectively.
[0012] Preferably, a clutch cooling inlet oil pressure sensor is installed on the inlet side of the clutch cooling oil channel, a clutch cooling outlet oil pressure sensor is installed on the outlet side of the clutch cooling oil channel, and a clutch cooling temperature sensor and a clutch cooling flow sensor are installed on the return oil line of the clutch cooling oil channel; the clutch cooling inlet oil pressure sensor, the clutch cooling outlet oil pressure sensor, the clutch cooling temperature sensor and the clutch cooling flow sensor are electrically connected to the controller respectively.
[0013] The present invention also provides a test method for a clutch lowering speed control test device, comprising the following steps: S1. According to the specifications of the clutch to be tested, select a weight mass that matches it for testing; use the weight as the power input end of the drum, the clutch as the test output end, install a speed sensor on the drum and a torque sensor on the clutch; S2. Before the test, the drum speed threshold is set; during the test, the weight is lowered at different lowering mode speeds to drive the drum to rotate; during the lowering of the weight, the pressure of the proportional pressure reducing valve is adjusted by the controller so that the drum rotation speed is ≤ the set drum speed threshold until the weight falls to the ground; at the same time, during the lowering of the weight, the dynamic oil pressure value of the clutch in the lowering time series, the dynamic torque value of the clutch in the lowering time series and the dynamic speed of the drum are collected through the data acquisition component to establish a clutch pressure-drum speed-input torque database; S3. According to the specifications of the clutch to be tested, within the mass range of the weights that match it, select weights of different weights, repeat the above steps, improve the clutch pressure-reel speed-input torque database, and form a verification database for the clutch to be tested.
[0014] Preferably, the lowering modes of the heavy object include a full-release free-fall lowering mode and a controllable free-fall lowering mode; the heavy object is lowered at a uniform speed or uniform acceleration in the controllable free-fall lowering mode.
[0015] Preferably, when the weight is lowered in full-release free-fall mode, the test steps are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the free-fall control mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve, the clutch output valve and the clutch control valve respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure value reaches the set pressure, the controller supplies power to the proportional pressure reducing valve to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to engage and disengage, and the weight falls freely, and the controller collects the drum speed, clutch cooling flow value, clutch cooling temperature value, and torque value during this process; when the controller detects that the drum speed is lower than the target set value, it indicates that the weight has landed under the action of gravity acceleration, at which time the system pressure solenoid valve, the clutch output valve and the clutch control valve lose power, the clutch resets and closes, and the free-fall test is completed; When the weight is lowered in a controlled free fall mode, the test steps are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the controlled free fall lowering mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve, clutch output valve and clutch control valve respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure value reaches the set pressure, the controller supplies power to the proportional pressure reducing valve to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to engage and disengage, and the weight begins to fall; at this time, the controller establishes a clutch pressure-reel speed-input torque database , set the target speed of the reel. When the reel speed collected by the controller is higher or lower than the set reel target speed, the controller feeds back the data to the proportional pressure reducing valve, and after retrieving the clutch pressure-reel speed-input torque database data, dynamically adjusts the current or voltage value of the proportional pressure reducing valve until the reel speed reaches the set reel target speed, and the speed control is completed; in addition, during the lowering of the heavy object, the controller collects the reel speed, clutch cooling flow value, clutch cooling temperature value and torque value; when the controller detects that the reel speed is lower than the target setting value, it indicates that the heavy object has fallen to the ground under the action of gravity acceleration. At this time, the system pressure solenoid valve, clutch output valve and clutch control valve lose power, the clutch resets and closes, and the controlled free fall test is completed. Beneficial Effects
[0016] The test device of the present invention is provided with a reel assembly, a hydraulic assembly and a control assembly, wherein the reel assembly is installed on the top of the test frame, with a weight as the test input end and a clutch as the output end, and the reel is driven to rotate by lowering the weight, and then the clutch oil pressure is adjusted to achieve the lowering of the weight in two modes of speed: controllable free fall and full release free fall. The lowering of the weight drives the reel to rotate, and a speed sensor is installed on the reel, and a reel speed threshold is set. When the reel speed is higher than the threshold, the clutch pressure regulating port is adjusted by the controller to quickly respond to the pressure drop, and the clutch opening degree becomes smaller, so that when the reel speed is controlled to be ≤ the set threshold, the clutch pressure drop is closed. The test process of the test device of the present invention is low in difficulty and the test results are highly accurate. On the other hand, the present invention realizes the uniform speed / uniform acceleration / free fall of heavy objects through the clutch, collects the dynamic torque value of the clutch in the uniform speed / uniform acceleration / free fall process in a time series through a torque sensor, and collects the dynamic oil pressure value of the clutch in the uniform speed / uniform acceleration / free fall process in a time series through a pressure sensor. The sampling rates of the oil pressure value and the torque value are consistent, and a relationship curve between the clutch oil pressure and the dynamic torque in a time series can be established to complete the closed loop of the clutch automatic speed control lowering test to establish a clutch pressure-drum speed-input torque database. Through the test method of the present invention, for clutches of different specifications, weights of different weights can be configured for testing. Through a large amount of sampling data, the clutch pressure-drum speed-input torque database can be improved, providing a test basis for the product design of the clutch and the reliability design of the whole vehicle system control, thereby improving the safety and economy of the whole vehicle system.
[0017] The present invention establishes a clutch pressure-reel speed-input torque database, realizes the weight on the test stand, and controls the current / voltage of the proportional pressure reducing valve in the hydraulic assembly to realize the uniform speed / uniform acceleration / free fall of the weight under the action of the clutch. In this test process, the reliability of the control assembly is tested, and the dynamic torque value of the clutch under different oil pressures is collected, which provides a test basis for realizing the uniform speed / uniform acceleration / free fall of the product. Compared with the traditional test, the present invention controls the uniform speed / uniform acceleration / free fall of the weight by setting the relationship logic between the target speed threshold of the reel and the actual speed of the reel, and can achieve the target function. In addition, the torque value will change dynamically within a certain range during the process of lowering the weight, and the clutch oil pressure value will have instantaneous impact during the process of lowering, etc., which poses certain safety risks. On this basis, the present invention sets a torque sensor to collect the torque value of the clutch, realizes the relationship logic among the reel speed, clutch oil pressure and clutch torque, reduces the instantaneous impact during the process of lowering the weight, and improves the safety of the test device.
[0018] The present invention can ensure the accuracy and precision of the input by dynamically adjusting the clutch oil pressure value by using the clutch proportional pressure reducing valve current / voltage. Compared with the test device in the prior art, which uses a disc spring / round spring brake clutch, there is a problem of data leakage due to the short disc spring / round spring travel distance and insufficient input oil pressure accuracy. By using a torque sensor to output the dynamic torque value of the clutch, the accuracy of the clutch torque value can be guaranteed.
[0019] The present invention realizes process monitoring of lowering speed control by pre-arranging oil pressure, temperature, flow, speed, and torque sensors in each channel, can feedback product information in the first time, and realize self-adjustment of the system without manual intervention, so as to realize uniform speed / uniform acceleration lowering of heavy objects. The present invention can adapt to different usage requirements of winches of different specifications, that is, sampling from the clutch pressure-drum speed-input torque database, and feeding back the collected data to the database, so as to automatically improve the sample in this way, thereby realizing the self-correction and self-monitoring functions of system control. On the other hand, the clutch pressure-drum speed-input torque database contains clutch operating parameter data, which can provide data support for clutch component design, facilitate improving the accuracy of clutch component design parameters, improve component design quality and reduce component design costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic structural diagram of a test stand for a clutch lowering speed control test device according to an embodiment; Figure 2 A schematic diagram of the structure of a test assembly and a clutch of a clutch lowering speed control test device according to an embodiment; Figure 3 A control logic diagram of a clutch lowering speed control test device of an embodiment adopting a full-release free-fall lowering mode; Figure 4 It is a control logic diagram of the clutch lowering speed control test device of the embodiment adopting the controllable free fall lowering mode. DETAILED DESCRIPTION
[0021] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.
[0022] See also Figure 1-Figure 4The present embodiment provides a clutch lowering speed control test device, comprising a test frame 1, a test assembly and a clutch 5, the test assembly comprising a drum assembly, a hydraulic assembly and a control assembly; the drum assembly is installed at the bottom of the test frame, and is provided with a drum 3 and a wire rope sleeved on the drum, the end of the wire rope is connected with a weight 2, the weight 2 is installed on the test frame 1 through a sliding wheel, and the weight falls to drive the drum 3 to rotate; the clutch shaft of the clutch 5 is connected to the power shaft of the drum; the power output end of the hydraulic assembly is connected to the clutch; the control assembly comprises a controller and a data acquisition assembly, the data acquisition assembly comprises a plurality of sensors for collecting data including the working oil pressure value of the clutch, the drum speed value and the torque value of the clutch; the controller is electrically connected to the hydraulic assembly to adjust the clutch to control the lowering speed of the weight.
[0023] One end of the power shaft of the reel in this embodiment is connected to a hydraulic motor 7 for driving the reel to rotate and lift the heavy object to the top of the test frame. The other end of the power shaft is connected to the input shaft of the reducer 4, and the output shaft of the reducer is connected to the clutch shaft of the clutch. A speed sensor AI12 (not shown) is installed on the power shaft side of the reel, and a torque sensor AI13 (not shown) is connected to the clutch shaft of the clutch. The speed sensor and the torque sensor are electrically connected to the controller respectively. The speed sensor is an absolute encoder.
[0024] The hydraulic assembly of this embodiment includes a hydraulic pump assembly, a clutch control valve group, a connecting pipeline and a hydraulic oil tank 9; the hydraulic pump assembly includes a hydraulic pump 6 and a hydraulic pump drive motor 60, and the power end of the hydraulic pump drive motor is connected to the hydraulic pump input shaft; the clutch control valve group includes a clutch output valve A005A, a speed regulating valve 8 and a proportional pressure reducing valve A001; the hydraulic pump 6 is connected to the clutch output valve, the speed regulating valve, the proportional pressure reducing valve, the clutch and the hydraulic oil tank 9 in sequence through the connecting pipeline to form a clutch drive oil circuit. A system pressure solenoid valve A003 is also provided between the hydraulic pump power output end and the hydraulic oil tank of the clutch drive oil circuit of this embodiment to adjust the output pressure of the hydraulic pump; the clutch output valve A005A is a three-position four-way valve, and a filter 10 is also connected between the clutch output valve and the speed regulating valve; an overflow valve 11 is installed on the clutch drive oil circuit to set the maximum working oil pressure of the clutch; the clutch output valve A005A, the proportional pressure reducing valve A001 and the system pressure solenoid valve A003 are respectively electrically connected to the controller. A clutch control valve YV01 is connected in parallel between the proportional pressure reducing valve and the hydraulic oil tank, and the clutch control valve is a two-position two-way valve; the input end of the clutch control valve is connected to the oil circuit between the clutch and the proportional pressure reducing valve through a connecting pipeline, and its output end is connected to the clutch cooling oil channel through a connecting pipeline to form a clutch cooling oil circuit for cooling the clutch. The return oil channel of the clutch cooling oil channel is connected to the hydraulic oil tank 9 through a connecting pipeline; the clutch control valve YV01 is electrically connected to the controller. In addition, the clutch drive oil circuit of this embodiment is provided with a system oil pressure sensor AI11 and a clutch oil pressure sensor AI06; the system oil pressure sensor is installed at the power output end of the hydraulic pump to monitor the system pressure value; the clutch oil pressure sensor is installed at the input end side of the proportional pressure reducing valve to monitor the working oil pressure value of the clutch; the system oil pressure sensor and the clutch oil pressure sensor are electrically connected to the controller respectively. Furthermore, in the clutch cooling oil circuit of the present embodiment, a clutch cooling inlet oil pressure sensor AI07 is installed on the inlet side of the clutch cooling oil channel, a clutch cooling outlet oil pressure sensor AI05 is installed on the outlet side of the clutch cooling oil channel, and a clutch cooling temperature sensor AI08 and a clutch cooling flow sensor AI09 are installed on the return oil circuit of the clutch cooling oil circuit; the clutch cooling inlet oil pressure sensor, the clutch cooling outlet oil pressure sensor, the clutch cooling temperature sensor and the clutch cooling flow sensor are electrically connected to the controller respectively.
[0025] This embodiment also provides a test method for a clutch lowering speed control test device, comprising the following steps: S1. According to the specifications of the clutch to be tested, select a weight mass that matches it for testing; use the weight as the power input end of the drum, the clutch as the test output end, install a speed sensor on the drum and a torque sensor on the clutch; S2. Before the test, set the drum speed threshold; during the test, the weight is lowered at different lowering mode speeds to drive the drum to rotate; the weight lowering modes include full release free fall lowering mode and controllable free fall lowering mode; the weight is lowered at a uniform speed or uniform acceleration in the controllable free fall lowering mode. During the lowering process of the weight, the controller adjusts the pressure of the proportional pressure reducing valve so that the drum rotation speed is ≤ the set drum speed threshold until the weight falls to the ground; at the same time, during the lowering process of the weight, the data acquisition component is used to collect the dynamic oil pressure value of the clutch in the lowering time series, the dynamic torque value of the clutch in the lowering time series, and the dynamic speed of the drum to establish a clutch pressure-drum speed-input torque database; S3. According to the specifications of the clutch to be tested, within the mass range of the weights that match it, select weights of different weights, repeat the above steps, improve the clutch pressure-reel speed-input torque database, and form a verification database for the clutch to be tested.
[0026] Furthermore, when the weight is lowered in the full-release free-fall mode, the test steps of the test device of this embodiment are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, and then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the free-fall control mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve A003, the clutch output valve A005A and the clutch control valve YV01 respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure AI06 reaches the set pressure, the controller supplies power to the proportional reducer. The pressure valve A001 is powered to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to disengage, and the weight falls freely. During this process, the controller collects the reel speed AI12, clutch cooling flow value AI09, clutch cooling temperature value AI08, and torque value AI13; when the controller detects that the reel speed AI12 is lower than the target setting value, it indicates that the weight has fallen to the ground under the action of gravity acceleration. At this time, the system pressure solenoid valve A003, clutch output valve A005A and clutch control valve AYV01 lose power, clutch 5 resets and closes, and the free fall test is completed; When the weight is lowered in a controlled free fall mode, the test steps are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the controlled free fall lowering mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve, clutch output valve and clutch control valve respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure value reaches the set pressure, the controller supplies power to the proportional pressure reducing valve to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to engage and disengage, and the weight begins to fall; at this time, the controller establishes a clutch pressure-reel speed-input torque database , set the target speed of the reel. When the reel speed collected by the controller is higher or lower than the set reel target speed, the controller feeds back the data to the proportional pressure reducing valve, and after retrieving the clutch pressure-reel speed-input torque database data, dynamically adjusts the current or voltage value of the proportional pressure reducing valve until the reel speed reaches the set reel target speed, and the speed control is completed; in addition, during the lowering of the heavy object, the controller collects the reel speed, clutch cooling flow value, clutch cooling temperature value and torque value; when the controller detects that the reel speed is lower than the target setting value, it indicates that the heavy object has fallen to the ground under the action of gravity acceleration. At this time, the system pressure solenoid valve, clutch output valve and clutch control valve lose power, the clutch resets and closes, and the controlled free fall test is completed.
[0027] As above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims
1. A clutch lowering speed control test device, comprising a test stand, a test assembly and a clutch, characterized in that: The test assembly includes a drum assembly, a hydraulic assembly and a control assembly; the drum assembly is installed at the bottom of the test frame, and is provided with a drum and a wire rope sleeved on the drum, a weight is connected to the end of the wire rope, the weight is installed on the test frame through a sliding wheel, and the weight falls to drive the drum to rotate; the clutch shaft of the clutch is connected to the power shaft of the drum; the power output end of the hydraulic assembly is connected to the clutch; the control assembly includes a controller and a data acquisition assembly, and the data acquisition assembly includes a plurality of sensors for collecting data including the working oil pressure value of the clutch, the drum speed value and the torque value of the clutch; the controller is electrically connected to the hydraulic assembly to adjust the clutch to control the lowering speed of the weight.
2. A clutch lowering speed control test device according to claim 1, characterized in that: One end of the power shaft of the reel is connected to a hydraulic motor for driving the reel to rotate and lift the heavy object to the top of the test frame. The other end of the power shaft is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the clutch shaft of the clutch. A speed sensor is installed on the power shaft side of the reel, and a torque sensor is connected to the clutch shaft of the clutch. The speed sensor and the torque sensor are electrically connected to the controller respectively. The speed sensor is an absolute encoder.
3. A clutch lowering speed control test device according to claim 1, characterized in that: The hydraulic assembly includes a hydraulic pump assembly, a clutch control valve group, connecting pipelines and a hydraulic oil tank; the hydraulic pump assembly includes a hydraulic pump and a hydraulic pump drive motor, and the power end of the hydraulic pump drive motor is connected to the hydraulic pump input shaft; the clutch control valve group includes a clutch output valve, a speed regulating valve and a proportional pressure reducing valve; the hydraulic pump is connected to the clutch output valve, the speed regulating valve, the proportional pressure reducing valve, the clutch and the hydraulic oil tank in sequence through connecting pipelines to form a clutch drive oil circuit.
4. A clutch lowering speed control test device according to claim 3, characterized in that: A system pressure solenoid valve is also provided between the hydraulic pump power output end of the clutch drive oil circuit and the hydraulic oil tank, which is used to adjust the output pressure of the hydraulic pump; the clutch output valve is a three-position four-way valve, and a filter is also connected between the clutch output valve and the speed regulating valve; an overflow valve is installed on the clutch drive oil circuit, which is used to set the maximum working oil pressure of the clutch; the clutch output valve, proportional pressure reducing valve and system pressure solenoid valve are electrically connected to the controller respectively.
5. A clutch lowering speed control test device according to claim 3, characterized in that: A clutch control valve is connected in parallel between the proportional pressure reducing valve and the hydraulic oil tank, and the clutch control valve is a two-position two-way valve; the input end of the clutch control valve is connected to the oil circuit between the clutch and the proportional pressure reducing valve through a connecting pipeline, and the output end is connected to the clutch cooling oil channel through a connecting pipeline to form a clutch cooling oil circuit for cooling the clutch, and the return oil channel of the clutch cooling oil channel is connected to the hydraulic oil tank through a connecting pipeline; the clutch control valve is electrically connected to the controller.
6. A clutch lowering speed control test device according to claim 4, characterized in that: The clutch drive oil circuit is provided with a system oil pressure sensor and a clutch oil pressure sensor; the system oil pressure sensor is installed at the power output end of the hydraulic pump to monitor the system pressure value; the clutch oil pressure sensor is installed at the input end side of the proportional pressure reducing valve to monitor the working oil pressure value of the clutch; the system oil pressure sensor and the clutch oil pressure sensor are electrically connected to the controller respectively.
7. A clutch lowering speed control test device according to claim 5, characterized in that: A clutch cooling inlet oil pressure sensor is installed on the clutch cooling oil channel inlet side of the clutch cooling oil channel, a clutch cooling outlet oil pressure sensor is installed on the clutch cooling oil channel outlet side, and a clutch cooling temperature sensor and a clutch cooling flow sensor are installed on the return oil line of the clutch cooling oil channel; the clutch cooling inlet oil pressure sensor, the clutch cooling outlet oil pressure sensor, the clutch cooling temperature sensor and the clutch cooling flow sensor are electrically connected to the controller respectively.
8. A test method for a clutch lowering speed control test device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. According to the specifications of the clutch to be tested, select a weight mass that matches it for testing; use the weight as the power input end of the drum, the clutch as the test output end, install a speed sensor on the drum and a torque sensor on the clutch; S2. Before the test, the drum speed threshold is set; during the test, the weight is lowered at different lowering mode speeds to drive the drum to rotate; during the lowering of the weight, the pressure of the proportional pressure reducing valve is adjusted by the controller so that the drum rotation speed is ≤ the set drum speed threshold until the weight falls to the ground; at the same time, during the lowering of the weight, the dynamic oil pressure value of the clutch in the lowering time series, the dynamic torque value of the clutch in the lowering time series and the dynamic speed of the drum are collected through the data acquisition component to establish a clutch pressure-drum speed-input torque database; S3. According to the specifications of the clutch to be tested, within the mass range of the weights that match it, select weights of different weights, repeat the above steps, improve the clutch pressure-reel speed-input torque database, and form a verification database for the clutch to be tested.
9. The test method of the clutch lowering speed control test device according to claim 8, characterized in that: The lowering modes of the heavy object include a full-release free-fall lowering mode and a controllable free-fall lowering mode; the heavy object is lowered at a uniform speed or uniform acceleration in the controllable free-fall lowering mode.
10. The test method of the clutch lowering speed control test device according to claim 9, characterized in that: When the weight adopts the full-release free-fall lowering mode, the test steps are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the free-fall control mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve, the clutch output valve and the clutch control valve respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure value reaches the set pressure, the controller supplies power to the proportional pressure reducing valve to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to engage and disengage, and the weight falls freely. During this process, the controller collects the reel speed, clutch cooling flow value, clutch cooling temperature value, and torque value; when the controller detects that the reel speed is lower than the target set value, it indicates that the weight has landed under the action of gravity acceleration, at which time the system pressure solenoid valve, the clutch output valve and the clutch control valve lose power, the clutch is reset and closed, and the free-fall test is completed; When the weight adopts the controllable free fall lowering mode, the test steps are as follows: the weight is lifted from the bottom of the test frame to the top of the test frame by the lifting force of the hydraulic motor, then the hydraulic motor stops, the clutch is locked, and the weight is suspended at the top of the test frame; then the controller starts the controllable free fall lowering mode: after setting the system pressure, the controller supplies power to the system pressure solenoid valve, the clutch output valve and the clutch control valve respectively; then the controller performs a logical judgment on the clutch oil pressure value, and when the clutch oil pressure value reaches the set pressure, the controller supplies power to the proportional pressure reducing valve to open the clutch drive oil circuit, otherwise the system pressure will be adjusted; the clutch is hydraulically driven to engage and disengage, and the weight begins to fall; at this time, the controller establishes the clutch pressure-reel speed-input torque data The target speed of the reel is set in the database. When the reel speed collected by the controller is higher or lower than the set reel target speed, the controller feeds back the data to the proportional pressure reducing valve, and after retrieving the clutch pressure-reel speed-input torque database data, dynamically adjusts the current or voltage value of the proportional pressure reducing valve until the reel speed reaches the set reel target speed, and the speed control is completed; in addition, during the lowering of the heavy object, the controller collects the reel speed, clutch cooling flow value, clutch cooling temperature value and torque value; when the controller detects that the reel speed is lower than the target setting value, it indicates that the heavy object has landed under the action of gravity acceleration. At this time, the system pressure solenoid valve, clutch output valve and clutch control valve lose power, the clutch resets and closes, and the controlled free fall test is completed.