Differential pressure transmitter test bed and hydraulic control system thereof

Abstract

The invention relates to the technical field of differential pressure indicator detection, and particularly discloses a differential pressure indicator test bed and a hydraulic control system thereof. A plurality of threaded holes are formed in the testing valve block, a second flow channel and a first flow channel are formed in the testing valve block, and the second flow channel and the first flow channel are both communicated with the threaded holes; the number of the sleeves is multiple, the sleeves are located on the outer sides of the threaded holes, the sleeves are rotationally arranged on the test valve block, mounting holes are formed in the sleeves, and the mounting holes are matched with the differential pressure indicator; when the sleeve rotates, the differential pressure indicator can be driven to rotate, and the differential pressure indicator can slide relative to the sleeve in the depth direction of the mounting hole. And the driving mechanism is used for driving the sleeves to rotate synchronously. According to the invention, the mounting and dismounting processes of the differential pressure signal transmitter can be simplified.

Description

Technical Field

[0001] The present application relates to the technical field of differential pressure transmitter detection, and in particular to a differential pressure transmitter test bench and a hydraulic control system thereof. Background Art

[0002] The differential pressure transmitter, also known as the differential pressure transmitter or pressure alarm, is mainly used in hydraulic systems. When the hydraulic system is working, the filter element in the filter will gradually become clogged due to the pollutants in the interception system, resulting in a pressure difference between the inlet and outlet pressures (i.e., filter element pressure loss). When the pressure difference value increases to the value preset by the differential pressure transmitter, the differential pressure transmitter will automatically send a signal to alarm the filter blockage in the form of a switch. This alarm mechanism can promptly notify the system operator of the filter element blockage so that they can take timely measures to clean or replace the filter element.

[0003] In addition, the differential pressure transmitter can also cut off the control circuit related to the hydraulic system in the form of a switch. When the filter element is severely clogged to the point where emergency treatment is required, the transmitter will automatically cut off the control circuit to protect the safety of the system and prevent potential dangers caused by filter element clogs. The differential pressure transmitter has high measurement accuracy and can accurately sense the clogging of the filter element to ensure the normal operation of the hydraulic system. After the pressure differential indicator is produced, it is necessary to pass pressure oil into each pressure differential indicator for testing to determine whether the pressure differential indicator meets the product requirements. The pressure differential indicator is usually tested on a test bench, which is equipped with multiple installation stations, and a pressure differential indicator can be installed in each installation station; the installation station is provided with a threaded hole, and the end of the pressure differential indicator is provided with an external thread. When installing, the end of the pressure differential indicator is screwed into the threaded hole to connect the pressure differential indicator and the corresponding pressure oil flow channel, so that it is convenient to pass pressure oil into both ends of the pressure differential indicator for testing. During installation, multiple pressure differential indicators need to be screwed into the corresponding threaded holes in turn, and after the test is completed, the pressure differential indicators need to be selected from the threaded holes in turn, which makes the installation and removal process of the pressure differential indicator more cumbersome. Summary of the invention

[0004] In order to simplify the installation and disassembly process of the pressure differential indicator, the present application provides a pressure differential indicator test bench and a hydraulic control system thereof.

[0005] The present application provides a pressure differential transmitter test bench and a hydraulic control system thereof, which adopt the following technical solutions: In the first aspect, the present application provides a pressure difference transmitter test bench, which adopts the following technical solution: A pressure difference transmitter test bench, comprising: Test bench body; A test valve block is arranged on the test bench body, the test valve block is provided with a plurality of threaded holes for installing a differential pressure transmitter, the test valve block is provided with a second flow channel and a first flow channel for circulating pressure oil, and the second flow channel and the first flow channel are both connected to the inside of the threaded hole; A sleeve, wherein a plurality of sleeves are provided, each sleeve corresponds to a threaded hole, the sleeve is located outside the threaded hole, the sleeve is rotatably provided on the test valve block with the center line of the threaded hole as the rotation axis, and a mounting hole for installing a differential pressure transmitter is provided on the sleeve, the mounting hole is adapted to the differential pressure transmitter, so that the differential pressure transmitter can be driven to rotate when the sleeve rotates and the differential pressure transmitter can slide relative to the sleeve along the depth direction of the mounting hole; The driving mechanism includes a rotating rod and a transmission assembly. The rotating rod is rotatably arranged on the test valve block. The transmission assembly is provided with multiple groups, each group of the transmission assembly corresponds to a sleeve. The transmission assembly includes a driving gear, a driven gear ring and a bevel gear pair. The driving gear is rotatably arranged on the test valve block, the driven gear ring is coaxially fixedly connected to the sleeve, the driving gear and the driven gear ring are meshed, and the bevel gear pair is transmission-connected between the rotating rod and the driving gear.

[0006] By adopting the above technical solution, when the rotating rod rotates, multiple driving gears can be rotated through the bevel gear pair, the driving gear drives the driven gear ring to rotate, the driven gear ring drives the corresponding sleeve to rotate, the sleeve drives the pressure differential transmitter to rotate, and the pressure differential transmitter can slide relative to the sleeve while rotating, so that the pressure differential transmitter can be screwed into the threaded hole. Therefore, the installation and disassembly of multiple pressure differential transmitters can be quickly completed by rotating the rotating rod, and the installation and disassembly process is simpler.

[0007] Optionally, a pressure assembly is provided on the test valve block, and the pressure assembly includes a pressure plate and a first elastic member. The pressure plate is located at an end of the sleeve away from the threaded hole, and the pressure plate is slidably arranged on the test valve block along the axial direction of the sleeve. The first elastic member is arranged between the pressure plate and the test valve block, and the first elastic member is used to make the pressure plate press against the pressure differential transmitter installed in the threaded hole.

[0008] By adopting the above technical solution, after the pressure differential transmitter is placed above the threaded hole, the first elastic member can make the pressure plate press against the top of the pressure differential transmitter, so when the sleeve drives the pressure differential transmitter to rotate, it is easier to screw the pressure differential transmitter into the threaded hole, and the setting of the pressing component can prevent the pressure differential transmitter from rotating in situ and affecting the installation; in addition, the pressure plate presses against the pressure differential transmitter, thereby ensuring the tightness of the threaded fit between the pressure differential transmitter and the threaded hole, thereby enhancing the sealing effect of the connection, making it difficult for the pressure oil to leak out, and helping to ensure the accuracy of the test results.

[0009] Optionally, a locking assembly is provided between the pressure plate and the test valve block, the locking assembly includes an insertion rod and a second elastic member, the insertion rod is slidably provided on the test valve block, a socket for inserting the end of the insertion rod is provided on the pressure plate, and the second elastic member is provided between the insertion rod and the test valve block, and the second elastic member causes the insertion rod to have a tendency to slide toward a side close to the socket.

[0010] By adopting the above technical solution, the end of the insertion rod is inserted into the socket, so that the pressure plate is placed above the sleeve, and the pressure plate and the subsequently installed pressure differential indicator are in a separated state. At this time, multiple pressure differential indicators can be placed in the corresponding mounting holes in the sleeve in turn, so the setting of the pressure plate is not easy to affect the process of placing the pressure differential indicator into the sleeve.

[0011] Optionally, the sleeve includes an outer cylinder and an inner cylinder, the outer cylinder is rotatably connected to the test valve block, the inner cylinder is arranged inside the outer cylinder and rotatably connected to the outer cylinder, the mounting hole is arranged on the inner cylinder, a clamping assembly is arranged between the outer cylinder and the inner cylinder, the clamping assembly includes a clamping block and a third elastic member, a mounting groove is provided on the inner wall of the outer cylinder along its own radial direction, one end of the clamping block is slidably connected to the inner wall of the mounting groove, the other end of the clamping block is located outside the mounting groove, a clamping groove for accommodating the clamping block is provided on the outer wall of the inner cylinder, the third elastic member is arranged between the clamping block and the inner wall of the mounting groove, the third elastic member makes the clamping block press against the inner wall of the clamping groove, and an inclined surface is provided on the end of the clamping block, so that after the pressure differential transmitter is installed in the threaded hole, the clamping block can be pushed to slide into the mounting groove when the outer cylinder rotates.

[0012] By adopting the above technical solution, the inner cylinder and the outer cylinder can rotate relative to each other. When the rotating rod is just started to rotate, since one end of the block is pressed against the card slot, the outer cylinder can drive the inner cylinder to rotate synchronously when it rotates, and the inner cylinder drives the pressure differential indicator to rotate, and the pressure differential indicator is gradually screwed into the threaded hole; as the rotation process proceeds, due to the problem of processing accuracy, multiple pressure differential indicators may not be able to be screwed into place with the corresponding threaded holes at the same time. When some of the pressure differential indicators are installed and cannot be rotated further, some pressure differential indicators may need to be screwed in further. At this time, the rotating rod is continued to be rotated, and the pressure differential indicator that has been screwed into place cannot be rotated, so that the corresponding inner cylinder remains stationary. Therefore, the rotating outer cylinder can make one end of the block slide out of the card slot, so that the outer cylinder rotates relative to the inner cylinder. Therefore, the rotating rod can continue to rotate, so that the outer cylinder and the inner cylinder at the pressure differential indicator that has not been screwed into place continue to rotate synchronously until all the pressure differential indicators are screwed into place. Therefore, the inner and outer separation design of the sleeve can reduce the influence of the processing error on the installation process, which helps to ensure the installation effect.

[0013] Optionally, the end of the clamping block close to the inner cylinder is arranged in an arc shape, and the central angle of the end surface of the clamping block close to the inner cylinder is greater than the central angle of the inner wall of the clamping groove.

[0014] By adopting the above technical solution, there is a gap between the end face of the card block close to one end of the inner cylinder and the inner wall of the card slot, so that there is a line contact between the end of the card block close to the inner cylinder and the inner wall of the card slot. Therefore, when the end of the card block slides out of the card slot, the end of the card block is pressed against the outer wall of the inner cylinder. At this time, the abutment force between the outer cylinder and the inner cylinder is small, so the outer cylinder is easier to rotate relative to the inner cylinder, so that it is convenient to insert the end of the card block into the next card slot, so as to facilitate the subsequent synchronous rotation of the outer cylinder and the inner cylinder.

[0015] Optionally, a receiving groove is provided on the inner wall of the mounting hole, a ball is provided in the receiving groove, and the ball is located on a side outside the receiving groove for abutting against a portion of the pressure difference transmitter located in the mounting hole.

[0016] By adopting the above technical solution, the friction between the differential pressure transmitter and the mounting hole can be converted into rolling friction, which helps to reduce friction, facilitates relative sliding between the differential pressure transmitter and the mounting hole, and helps the differential pressure transmitter to be screwed in smoothly.

[0017] Optionally, an oil receiving tray is provided on the test bench body below the test valve block.

[0018] By adopting the above technical solution, when the differential pressure transmitter is removed, the oil in the oil inlet holes of the test valve block and the differential pressure transmitter can fall onto the oil receiving tray, which is convenient for collecting the fallen oil, reduces waste, and also helps to ensure the working environment.

[0019] Optionally, the test valve block can be detachably connected to the test bench body.

[0020] By adopting the above technical solution, different types of differential pressure transmitters can be tested by replacing different test valve blocks, making the device more applicable.

[0021] Optionally, the test valve block is provided with a valve for controlling the opening and closing of the first flow channel.

[0022] By adopting the above technical solution, when the valve enables the first flow channel to be in an open state, pressurized oil flows through both the second flow channel and the first flow channel, thereby facilitating the device to detect the pressure differential indicator; when the valve enables the first flow channel to be in a closed state, pressurized oil flows only through the second flow channel, thereby facilitating the device to detect the pressure indicator; therefore, the device can choose to detect the pressure differential indicator or the pressure indicator as needed, and the device has stronger applicability.

[0023] In a second aspect, the present application provides a hydraulic control system, which adopts the following technical solution: A hydraulic control system, based on any of the above-mentioned pressure differential indicator test benches, includes an oil tank, the oil tank is connected to a gear pump, the gear pump is simultaneously connected to the oil port P of a relief valve and the oil port P of an electromagnetic reversing valve, the oil port T of the relief valve returns oil into the oil tank; the oil port A of the electromagnetic reversing valve is connected to a second flow channel, the second flow channel is used to be connected to one of the oil inlet holes of the pressure differential indicator, the oil port B of the electromagnetic reversing valve is connected to a first flow channel, the first flow channel is used to be connected to the other oil inlet hole of the pressure differential indicator, and a throttle valve is connected between the second flow channel and the first flow channel.

[0024] By adopting the above technical solution, pressure oil can be introduced into both ends of the pressure differential transmitter, thereby simulating the working environment of the pressure differential transmitter and detecting the pressure differential transmitter.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Rotate the rotating rod. Under the action of the transmission assembly, multiple sleeves can be rotated synchronously. The sleeves drive the corresponding differential pressure transmitters to rotate. The differential pressure transmitters can slide relative to the sleeves while rotating. Therefore, multiple differential pressure transmitters can be screwed into the threaded holes at the same time, which is conducive to quickly completing the installation and removal process of the differential pressure transmitters.

[0026] 2. After placing the differential pressure transmitter at the top of the threaded hole, the first elastic member causes the pressure plate to press against the differential pressure transmitter. Therefore, when the sleeve drives the differential pressure transmitter to rotate, the differential pressure transmitter is easier to screw into the threaded hole, and the differential pressure transmitter is not easy to rotate in place, which helps the screw-in process of the differential pressure transmitter to proceed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a cross-sectional view of an embodiment of the present application; Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 yes Figure 3 The enlarged schematic diagram of point B in the middle; Figure 5 It is a structural schematic diagram of the embodiment of the present application for showing the driving mechanism; Figure 6 is a schematic diagram of the structure of the pressing component used to illustrate the embodiment of the present application; Figure 7 is a schematic diagram of the structure of the locking assembly used to illustrate an embodiment of the present application; Figure 8 yes Figure 7 Sectional view at AA in the middle; Fig. 9 yes Figure 8 The enlarged schematic diagram of the center C; Fig.10 It is a schematic diagram of the hydraulic principle of a hydraulic control system according to an embodiment of the present application.

[0028] Figure numerals: 1. test bench body; 2. test valve block; 21. threaded hole; 22. first flow channel; 23. second flow channel; 3. sleeve; 31. outer cylinder; 311. mounting groove; 32. inner cylinder; 321. mounting hole; 322. clamping groove; 4. driving mechanism; 41. rotating rod; 411. handle; 42. transmission assembly; 421. driving gear; 422. driven gear ring; 423. driving bevel gear; 424. driven bevel gear; 5. pressing assembly; 51. pressing plate; 511. guide hole; 512. connecting strip; 5121. plug hole; 52. first elastic member; 6. locking assembly; 61. plug rod; 62. second elastic member; 7. clamping assembly; 71 , block; 711, inclined plane; 72, third elastic member; 8, differential pressure transmitter; 81, oil inlet hole; 82, accommodating chamber; 83, detection component; 9, support plate; 91, guide rod; 10, oil receiving tray; 11, oil tank; 12, gear pump; 13, oil suction filter; 14, medium pressure filter; 15, first one-way valve; 16, overflow valve; 17, solenoid reversing valve; 18, throttle valve; 19, pressure gauge; 20, pressure sensor; 24, vane pump; 25, return oil air cooler; 26, return oil filter; 27, second one-way valve; 28, liquid level and temperature gauge; 29, liquid level gauge electrical appliance; 30, temperature sensor; 33, air filter; 34, oil drain ball valve. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-10 This application is described in further detail.

[0030] The present application discloses a pressure differential transmitter test bench and a hydraulic control system thereof. Figure 1The pressure differential indicator 8 test bench includes a test bench body 1 and a test valve block 2 arranged on the test machine body. An operation panel is arranged on the test bench body 1, and an indicator light and an operation button are arranged on the operation panel. The indicator light includes two states: normally open and normally closed, which is convenient for controlling the hydraulic system. The pressure differential indicator 8 can be installed on the test valve block 2 to detect the pressure oil passed into the pressure differential indicator 8. The test valve block 2 is detachably connected to the test bench body 1 by bolts, so that the required type of test valve block 2 can be selected and installed as needed, and pressure differential indicators 8 of different models and sizes can be detected. The test valve block 2 is connected to the oil tank 11 inside the test bench body 1, so that oil can be supplied to the test valve block 2 for detection. An oil receiving tray 10 is arranged outside the test bench body 1 below the test valve block 2, and an oil leakage hole is opened on the oil receiving tray 10. A cavity for accommodating oil is arranged inside the joint tray, and the cavity is respectively connected with the oil leakage hole and the oil tank 11 inside the test bench body 1, so that it is convenient to collect the oil leaked during the disassembly of the pressure difference transmitter 8 into the oil tank 11, thereby recycling the pressure oil and reducing waste.

[0031] Reference Figure 2 and Figure 3 The differential pressure transmitter 8 is provided with two oil inlet holes 81, one of which is located on the circular end face of the differential pressure transmitter 8, and the other is located on the cylindrical side face of the differential pressure transmitter 8; the differential pressure transmitter 8 is provided with a receiving chamber 82 inside, in which a detection component 83 is slidably provided, and the two ends of the receiving chamber 82 are respectively connected with the two oil inlet holes 81. During detection, when pressure oil is introduced into the two oil inlet holes 81 at the same time, the detection component 83 in the differential pressure transmitter 8 can slide, thereby triggering the corresponding alarm mechanism to give an alarm.

[0032] Reference Figure 3 The top of the test valve block 2 is provided with a plurality of threaded holes 21, and the axis of the threaded holes 21 is vertical; there are a plurality of threaded holes 21, and they are evenly spaced along the length direction of the test valve block 2. The end of the differential pressure transmitter 8 is provided with an external thread that matches the threaded hole 21, so that it is convenient to screw the differential pressure transmitter 8 into the threaded hole 21, thereby completing the installation of the differential pressure transmitter 8. The interior of the test valve block 2 is provided with a first flow channel 22 and a second flow channel 23, and the end of the first flow channel 22 is connected to the side wall portion of the threaded hole 21; the end of the second flow channel 23 is connected to the bottom end of the threaded hole 21. When the end of the pressure differential indicator 8 and the threaded hole 21 are screwed into place, the pressure differential indicator 8 cannot continue to rotate. At this time, the oil inlet hole 81 on the end face of the pressure differential indicator 8 is connected to the second flow channel 23, and the oil inlet hole 81 on the cylindrical surface of the pressure differential indicator 8 is connected to the first flow channel 22. Therefore, the pressure oil can flow into the pressure differential indicator 8 through the second flow channel 23 and the first flow channel 22 respectively, so that the pressure differential indicator 8 is detected.

[0033] In addition, the device can also be used to detect pressure transmitters. The pressure transmitter is mainly used to measure the pressure at a certain point in the system. The pressure transmitter is only provided with an oil inlet hole 81. In order to facilitate the detection of the pressure transmitter, a valve for controlling the opening and closing of the first flow channel 22 is provided on the test valve block 2. When the valve opens the first flow channel 22, pressure oil can flow through both the second flow channel 23 and the first flow channel 22, so the pressure differential transmitter 8 can be detected; when the valve closes the first flow channel 22, pressure oil only flows through the second flow channel 23, so the pressure transmitter can be detected; therefore, the device has stronger applicability.

[0034] Reference Figure 3 and Figure 4 , a plurality of sleeves 3 are arranged on the test valve block 2, the number of sleeves 3 is the same as the number of threaded holes 21, and each sleeve 3 corresponds to a threaded hole 21. The sleeve 3 is a cylinder, the sleeve 3 is located outside the threaded hole 21, and the sleeve 3 and the threaded hole 21 are coaxially arranged; one end of the sleeve 3 is rotatably connected to the outer wall of the test valve block 2 around its own axis. The bottom end of the sleeve 3 is fixedly connected to a limit ring, and an annular groove for accommodating the limit ring is provided on the test valve block 2, and the limit ring is rotatably arranged in the annular groove, so that the sleeve 3 and the test valve block 2 are rotatably connected, thereby improving the stability of the sleeve 3 during the rotation process. A mounting hole 321 is provided in the center of the sleeve 3. The cross section of the mounting hole 321 is hexagonal, and the cross section of the mounting hole 321 is adapted to the cross section of the differential pressure transmitter 8. Therefore, after the differential pressure transmitter 8 is installed in the sleeve 3, the sleeve 3 can drive the differential pressure transmitter 8 to rotate synchronously when it rotates. Since the starting part of the thread on the differential pressure transmitter 8 abuts against the threaded hole 21, under the action of the threaded cooperation, the differential pressure transmitter 8 can be gradually screwed into the threaded hole 21 when it rotates until the installation of the differential pressure transmitter 8 is completed.

[0035] Reference Figure 5 The test valve block 2 is provided with a driving mechanism 4 for driving multiple differential pressure transmitters 8 to rotate synchronously, and the driving mechanism 4 includes a rotating rod 41 and a transmission assembly 42. The rotating rod 41 is arranged along the length direction of the test valve block 2, and the rotating rod 41 is arranged on the test valve block 2 to rotate around its own axis; a handle 411 is arranged at the end of the rotating rod 41 for easy gripping by the operator. There are multiple groups of transmission assemblies 42, and the multiple groups of transmission assemblies 42 are evenly spaced along the length direction of the rotating rod 41; the number of transmission assemblies 42 is the same as the number of sleeves 3, and each rotating assembly corresponds to one sleeve 3.

[0036] The transmission assembly 42 includes a driving gear 421, a driven gear ring 422 and a bevel gear pair. A support plate 9 is fixedly connected to one side of the test valve block 2. The support plate 9 is L-shaped, and the horizontal section of the support plate 9 is located above the sleeve 3. The axis of the driving gear 421 is vertical, and the driving gear 421 is rotatably set on the support plate 9; the driven gear ring 422 is coaxially fixedly connected to the outer wall of the sleeve 3; the driving gear 421 and the driven gear ring 422 are meshed. The bevel gear pair includes a driving bevel gear 423 and a driven bevel gear 424. The driving bevel gear 423 is coaxially fixedly connected to the rotating rod 41, and the driven bevel gear 424 is coaxially fixedly connected to the corresponding driving gear 421, and the driving bevel gear 423 and the driven bevel gear 424 are meshed. Therefore, when the rotating rod 41 rotates, the active bevel gear 423 can be driven to rotate, the active bevel gear 423 can drive the driven bevel gear 424 to rotate, the driven bevel gear 424 can drive the active gear 421 to rotate, the active gear 421 can drive the driven gear ring 422 to rotate, and the driven gear ring 422 can drive the sleeve 3 to rotate, so that multiple sleeves 3 can rotate synchronously, and the installation of the pressure difference transmitter 8 can be completed quickly.

[0037] The differential pressure transmitter 8 can slide relative to the inner wall of the mounting hole 321 when rotating. In order to ensure that the differential pressure transmitter 8 can be screwed in smoothly, a receiving groove is provided on the inner wall of the mounting hole 321. A ball is provided in the receiving groove, and the ball can roll in the receiving groove. The part of the ball outside the receiving groove is used to abut against the differential pressure transmitter 8, so that the sliding friction can be converted into rolling friction, thereby reducing the friction force.

[0038] Further, refer to Figure 6 The test valve block 2 is provided with a pressing assembly 5, which includes a pressing plate 51 and a first elastic member 52. The pressing plate 51 is arranged along the length direction of the test valve block 2, and the plate surface of the pressing plate 51 is horizontal. A guide rod 91 is fixedly connected to the horizontal section of the support plate 9, and the guide rod 91 is arranged vertically; guide holes 511 are opened at both ends of the pressing plate 51, and the guide rod 91 is slidably inserted into the guide holes 511, so that the pressing plate 51 is slidably arranged on the guide rod 91 along the vertical direction. The first elastic member 52 is a spring, and the first elastic member 52 is fixedly connected between the horizontal section of the support plate 9 and the pressure plate 51. The first elastic member 52 is in a compressed state. Therefore, after the pressure differential transmitter 8 is placed in the mounting hole 321 inside the sleeve 3, the first elastic member 52 can make the pressure plate 51 press against the top of the pressure differential transmitter 8; thus, the starting part of the threaded section of the pressure differential transmitter 8 can be pressed against the open end of the threaded hole 21, which facilitates the subsequent smooth screwing of the pressure differential transmitter 8 into the threaded hole 21 and prevents the pressure differential transmitter 8 from rotating in place.

[0039] In addition, refer to Figure 6 and Figure 7A locking assembly 6 is also provided between the pressure plate 51 and the support plate 9, and the locking assembly 6 includes an insertion rod 61 and a second elastic member 62. A circular hole is provided on the vertical section of the support plate 9, and the insertion rod 61 is slidably inserted in the circular hole; the second elastic member 62 is a spring, and the second elastic member 62 is fixedly connected between the insertion rod 61 and the support plate 9; a connecting strip 512 is fixedly connected to the pressure plate 51, and a socket 5121 is provided on the connecting strip 512 for the end of the insertion rod 61 to be inserted. By inserting one end of the insertion rod 61 into the socket 5121, the pressure plate 51 can be fixed in the current position. At this time, the pressure differential transmitter 8 can be placed in the corresponding mounting hole 321 inside the sleeve 3 in sequence. During the process of placing the pressure differential transmitter 8, the pressure plate 51 and the pressure differential transmitter 8 are in a separated state, so it is convenient to quickly place the pressure differential transmitter 8 into the sleeve 3. After the pressure differential transmitter 8 is inserted, the end of the insertion rod 61 is pulled out from the insertion hole 5121. At this time, the first elastic member 52 can make the pressure plate 51 slide downward and make the pressure plate 51 press against the top of the pressure differential transmitter 8. Then, the rotating rod 41 can be rotated to carry out subsequent installation.

[0040] In order to ensure the installation effect of the pressure difference transmitter 8, refer to Figure 3 and Figure 4 The sleeve 3 includes an outer cylinder 31 and an inner cylinder 32. The rotating ring is fixedly connected to the end of the outer cylinder 31, so that the outer cylinder 31 and the test valve block 2 are rotatably connected. The driven gear ring 422 is coaxially fixedly connected to the outer wall of the outer cylinder 31, so that the driven gear ring 422 can drive the outer cylinder 31 to rotate. The inner cylinder 32 is coaxially arranged inside the outer cylinder 31, and the outer diameter of the inner cylinder 32 is the same as the inner diameter of the outer cylinder 31; the inner cylinder 32 and the outer cylinder 31 are rotatably connected, so that the outer cylinder 31 can rotate relative to the inner cylinder 32. The mounting hole 321 is arranged on the inner cylinder 32.

[0041] Reference Figure 4 , Figure 8 and Fig. 9 A clamping assembly 7 is arranged between the outer cylinder 31 and the inner cylinder 32, and the clamping assembly 7 includes a clamping block 71 and a third elastic member 72. A mounting groove 311 is provided on the inner wall of the outer cylinder 31, and the groove depth direction of the mounting groove 311 is arranged along the radial direction of the outer cylinder 31; there are multiple mounting grooves 311, and they are arranged in a circumferential array. The number of clamping blocks 71 is the same as the number of mounting grooves 311, and each clamping block 71 corresponds to a mounting groove 311. One end of the clamping block 71 is slidably arranged in the mounting groove 311 along the groove depth direction of the mounting groove 311; a slider is fixedly connected to the outer wall of the clamping block 71, and a sliding groove is provided on the inner wall of the mounting groove 311 along the groove depth direction thereof, and the slider is slidably arranged in the sliding groove, so that the clamping block 71 and the mounting groove 311 are slidably connected. The groove depth of the mounting groove 311 is greater than the thickness of the clamping block 71, so that the clamping block 71 can completely slide into the mounting groove 311.

[0042] Reference Figure 8 and Fig. 9, a card slot 322 is provided on the outer wall of the inner cylinder 32, the number of the card slots 322 is the same as the number of the mounting slots 311, and each card slot 322 corresponds to a mounting slot 311; the shape of the card slot 322 matches the shape of the end of the card block 71. The third elastic member 72 is a spring, and the third elastic member 72 is fixedly connected between the end of the card block 71 and the bottom wall of the mounting slot 311. The third elastic member 72 is in a compressed state, and the third elastic member 72 makes the end of the card block 71 press against the card slot 322. An inclined surface 711 is provided at one end of the card block 71 close to the card slot 322, so that when the force received during the rotation process is large enough, the elastic force of the third elastic member 72 can be overcome, and the card block 71 can be completely pushed into the mounting slot 311, and the clamping connection between the outer cylinder 31 and the inner cylinder 32 is released.

[0043] After placing the differential pressure transmitter 8 in the mounting hole 321 inside the sleeve 3, the rotating rod 41 is rotated to rotate the outer cylinder 31. Since one end of the clamping block 71 is located in the mounting groove 311 and the other end of the clamping block 71 is located in the clamping groove 322, the outer cylinder 31 and the inner cylinder 32 are clamped and fixed. Therefore, when the outer cylinder 31 rotates, the inner cylinder 32 can be driven to rotate, and the inner cylinder 32 drives the differential pressure transmitter 8 to rotate, so that the end of the differential pressure transmitter 8 is gradually screwed into the threaded hole 21. When the differential pressure transmitter 8 is completely screwed into the threaded hole 21, the outer shell of the differential pressure transmitter 8 is pressed against the open end of the threaded hole 21, and the differential pressure transmitter 8 can no longer rotate, so the inner cylinder 32 corresponding to the differential pressure transmitter 8 can no longer rotate; at this time, the rotating rod 41 is continuously rotated, and under the action of the inclined surface 711, the elastic force of the third elastic member 72 can be overcome, so that the end of the block 71 slides out of the slot 322, and the block 71 is completely in the installation slot 311. At this time, the clamping connection between the outer cylinder 31 and the inner cylinder 32 is released, so that the outer cylinder 31 can continue to rotate while the inner cylinder 32 remains stationary, so that the rotating rod 41 can continue to rotate. Until all the differential pressure transmitters 8 are rotated to a state of being fully screwed with the threaded hole 21, the installation of the differential pressure transmitter 8 can be completed, and the installation effect can be guaranteed under the premise of ensuring the installation efficiency.

[0044] Furthermore, one end of the block 71 close to the slot 322 is arranged in an arc shape, and the bottom wall of the slot 322 is also arranged in an arc shape. The central angle of the end face of the block 71 close to the slot 322 is greater than the central angle corresponding to the bottom wall of the slot 322. Therefore, the surface contact between the block 71 and the slot 322 can be transformed into line contact, and the contact area is smaller. When the end of the block 71 slides out of the slot 322, relative rotation between the outer cylinder 31 and the inner cylinder 32 is more likely to occur.

[0045] The implementation principle of a pressure differential indicator 8 test bench according to an embodiment of the present application is as follows: in the initial state, one end of the insertion rod 61 is inserted into the insertion hole 5121, and the pressure plate 51 is in a position where it cannot abut against the pressure differential indicator 8. At this time, the pressure differential indicator 8 can be placed into the mounting hole 321 in the corresponding sleeve 3 in sequence. Then the end of the insertion rod 61 is pulled out of the insertion hole 5121, and the first elastic member 52 causes the pressure plate 51 to move downward, and causes the pressure plate 51 to abut against the top of the pressure differential indicator 8. At this time, each pressure differential indicator 8 can be manually fine-tuned so that the pressure differential indicator 8 is in a vertical state, and the initial part of the threaded section at the bottom end of the pressure differential indicator 8 is in a tight state with the open end of the threaded hole 21.

[0046] Then, the rotating rod 41 is rotated, the rotating rod 41 drives the active bevel gear 423 to rotate, the active bevel gear 423 drives the driven bevel gear 424 to rotate, the driven bevel gear 424 drives the active gear 421 to rotate, the active gear 421 drives the driven gear ring 422 to rotate, and the driven gear ring 422 drives the outer cylinder 31 to rotate; since one end of the clamping block 71 is clamped in the clamping groove 322 at this time, the outer cylinder 31 and the inner cylinder 32 are in a clamping state, when the outer cylinder 31 rotates, it can drive the inner cylinder 32 to rotate, and the inner cylinder 32 drives the pressure difference transmitter 8 to rotate; under the pressing action of the pressure plate 51, the pressure difference transmitter 8 can be gradually screwed into the threaded hole 21 when it rotates.

[0047] When one of the pressure differential transmitters 8 and the corresponding threaded hole 21 is completely screwed together, the rotation of the rotating rod 41 can make the outer cylinder 31 corresponding to this pressure differential transmitter 8 continue to rotate. At this time, the rotation of the outer cylinder 31 can make the end of the clamping block 71 slide out of the clamping groove 322, so that the outer cylinder 31 and the inner cylinder 32 are disengaged; therefore, the inner cylinder 32 and the pressure differential transmitter 8 can remain stationary, while the outer cylinder 31 can continue to rotate, so that the rotating rod 41 can continue to rotate, thereby continuing to complete the screwing of other pressure differential transmitters 8 until all the pressure differential transmitters 8 are in a completely screwed state.

[0048] At this time, the valve is in an open state, and pressure oil can be introduced into the second flow channel 23 and the first flow channel 22, so as to detect whether the pressure difference transmitter 8 meets the product requirements.

[0049] After the test is completed, when the differential pressure transmitter 8 is removed, the pressure plate 51 can be moved up, and the insertion rod 61 can be inserted into the insertion hole 5121 to fix the pressure plate 51 at the current position. At this time, the pressure plate 51 and the differential pressure transmitter 8 are in a separated state. Then, the rotating rod 41 is rotated in the reverse direction to drive the differential pressure transmitter 8 to rotate in the reverse direction, so that the differential pressure transmitter 8 can be quickly screwed out of the threaded hole 21.

[0050] Reference Fig.10The embodiment of the present application also discloses a hydraulic control system, including an oil tank 11, the oil tank 11 is connected to a gear pump 12, a motor and a bell coupling are arranged on one side of the gear pump 12, the bell coupling is connected between the output shaft of the motor and the gear pump 12, so that the gear pump 12 is driven by the motor to operate. An oil suction filter 13 is also connected between the oil tank 11 and the gear pump 12.

[0051] The output end of the gear pump 12 is connected to the medium pressure filter 14 and the first one-way valve 15 in sequence. The end of the first one-way valve 15 is connected to the oil port P of the overflow valve 16 and the oil port P of the electromagnetic reversing valve 17 at the same time. The oil port T of the overflow valve 16 returns oil to the oil tank 11. The oil port A of the electromagnetic reversing valve 17 is connected to the second flow channel 23, and the second flow channel 23 is used to be connected to one of the oil inlet holes 81 of the pressure differential transmitter 8. The oil port B of the electromagnetic reversing valve 17 is connected to the first flow channel 22, and the first flow channel 22 is used to be connected to the other oil inlet hole 81 of the pressure differential transmitter 8. The throttle valve 18 is connected between the second flow channel 23 and the first flow channel 22. Therefore, after the pressure differential transmitter 8 is installed on the test valve block 2, the pressure oil can be introduced into the two oil inlet holes 81 of the pressure differential transmitter 8 through the second flow channel 23 and the first flow channel 22, so as to detect whether the pressure differential transmitter 8 can work normally.

[0052] The test valve block 2 is arranged above the oil receiving tray 10 , and the oil receiving tray 10 is connected to the oil tank 11 , so it is convenient to recover the fallen oil into the oil tank 11 , reducing waste.

[0053] The pipelines beside the electromagnetic reversing valve 17 and the throttle valve 18 are provided with pressure measuring joints, pressure measuring hoses and pressure gauges 19 for detecting pipeline pressure. The second flow channel 23 and the first flow channel 22 are provided with pressure sensors 20 for detecting the pressure in the two flow channels respectively.

[0054] The oil tank 11 is also connected to a vane pump 24, and a motor and a bell coupling are provided on one side of the vane pump 24, and the bell coupling is connected between the output shaft of the motor and the vane pump 24. An oil return air cooler 25 and an oil return filter 26 are also connected between the output end of the vane pump 24 and the oil tank 11, which can accelerate the cooling of the pressure oil in the oil tank 11. A second one-way valve 27 is also connected in parallel to one side of the oil return air cooler 25 to limit the flow direction of the pressure oil.

[0055] In addition, the oil tank 11 is also provided with a liquid level and liquid temperature gauge 28, a liquid level gauge electrical appliance 29, a temperature sensor 30 and an air filter 33, which can detect the liquid level and temperature in the oil tank 11 and reduce the dust entering.

[0056] Both the oil tank 11 and the test valve block 2 are provided with oil drain ball valves 34, so that the oil can be quickly drained as needed.

[0057] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure differential transmitter test bench, characterized in that: include: Test bench body (1); A test valve block (2) is arranged on the test bench body (1), and a plurality of threaded holes (21) for mounting a differential pressure transmitter (8) are provided on the test valve block (2). A second flow channel (23) and a first flow channel (22) for circulating pressure oil are provided inside the test valve block (2), and the second flow channel (23) and the first flow channel (22) are both connected to the inside of the threaded hole (21); A sleeve (3), wherein a plurality of sleeves (3) are provided, each sleeve (3) corresponds to a threaded hole (21), the sleeve (3) is located outside the threaded hole (21), the sleeve (3) is rotatably arranged on the test valve block (2) with the center line of the threaded hole (21) as the rotation axis, the sleeve (3) is provided with a mounting hole (321) for mounting a differential pressure transmitter (8), the mounting hole (321) being adapted to the differential pressure transmitter (8), so that when the sleeve (3) rotates, the differential pressure transmitter (8) can be driven to rotate, and the differential pressure transmitter (8) can slide relative to the sleeve (3) along the depth direction of the mounting hole (321); The driving mechanism (4) comprises a rotating rod (41) and a transmission assembly (42), wherein the rotating rod (41) is rotatably mounted on the test valve block (2), the transmission assembly (42) is provided with a plurality of groups, each group of the transmission assembly (42) corresponds to a sleeve (3), the transmission assembly (42) comprises a driving gear (421), a driven gear ring (422) and a bevel gear pair, the driving gear (421) is rotatably mounted on the test valve block (2), the driven gear ring (422) is coaxially fixedly connected to the sleeve (3), the driving gear (421) and the driven gear ring (422) are meshed, and the bevel gear pair is transmission-connected between the rotating rod (41) and the driving gear (421).

2. A pressure differential transmitter test bench according to claim 1, characterized in that: The test valve block (2) is provided with a pressing assembly (5), the pressing assembly (5) comprising a pressing plate (51) and a first elastic member (52), the pressing plate (51) being located at an end of the sleeve (3) away from the threaded hole (21), the pressing plate (51) being slidably arranged on the test valve block (2) along the axial direction of the sleeve (3), the first elastic member (52) being arranged between the pressing plate (51) and the test valve block (2), the first elastic member (52) being used to make the pressing plate (51) press against a pressure differential transmitter (8) inserted into the threaded hole (21).

3. A pressure difference transmitter test bench according to claim 2, characterized in that: A locking assembly (6) is arranged between the pressure plate (51) and the test valve block (2), the locking assembly (6) comprising an insertion rod (61) and a second elastic member (62), the insertion rod (61) being slidably arranged on the test valve block (2), the pressure plate (51) being provided with an insertion hole (5121) for inserting an end of the insertion rod (61), the second elastic member (62) being arranged between the insertion rod (61) and the test valve block (2), the second elastic member (62) causing the insertion rod (61) to have a tendency to slide towards a side close to the insertion hole (5121).

4. A pressure differential transmitter test bench according to claim 1, characterized in that: The sleeve (3) comprises an outer sleeve (31) and an inner sleeve (32); the outer sleeve (31) is rotatably connected to the test valve block (2); the inner sleeve (32) is arranged inside the outer sleeve (31) and rotatably connected to the outer sleeve (31); the mounting hole (321) is arranged on the inner sleeve (32); a clamping assembly (7) is arranged between the outer sleeve (31) and the inner sleeve (32); the clamping assembly (7) comprises a clamping block (71) and a third elastic member (72); a mounting groove (311) is provided on the inner wall of the outer sleeve (31) along its radial direction; one end of the clamping block (71) slides with the inner wall of the mounting groove (311) The other end of the clamping block (71) is located outside the mounting groove (311), and a clamping groove (322) for accommodating the clamping block (71) is provided on the outer wall of the inner cylinder (32). The third elastic member (72) is arranged between the clamping block (71) and the inner wall of the mounting groove (311). The third elastic member (72) enables the clamping block (71) to be pressed against the inner wall of the clamping groove (322). An inclined surface (711) is provided at the end of the clamping block (71), so that after the pressure differential transmitter (8) is installed in the threaded hole (21), the outer cylinder (31) can push the clamping block (71) to slide into the mounting groove (311) when the outer cylinder (31) rotates.

5. A pressure difference transmitter test bench according to claim 4, characterized in that: One end of the clamping block (71) close to the inner cylinder (32) is arranged in an arc shape, and the center angle of the end surface of the end of the clamping block (71) close to the inner cylinder (32) is greater than the center angle of the inner wall of the clamping groove (322).

6. A pressure difference transmitter test bench according to claim 4, characterized in that: An accommodating groove is provided on the inner wall of the mounting hole (321), a ball is arranged in the accommodating groove, and the ball is located on a side outside the accommodating groove and is used to abut against a portion of the pressure difference transmitter (8) located inside the mounting hole (321).

7. A pressure difference transmitter test bench according to claim 1, characterized in that: An oil receiving tray (10) is provided on the test bench body (1) below the test valve block (2).

8. A pressure difference signaling device test bench according to claim 1, characterized in that: The test valve block (2) is detachably connected to the test bench body (1).

9. A pressure difference signaling device test bench according to claim 1, characterized in that: The test valve block (2) is provided with a valve for controlling the opening and closing of the first flow channel (22).

10. A hydraulic control system, based on the pressure difference indicator test bench according to any one of claims 1 to 9, characterized in that: The invention comprises an oil tank (11), the oil tank (11) being connected to a gear pump (12), the gear pump (12) being connected to an oil port P of a relief valve (16) and an oil port P of an electromagnetic reversing valve (17), the oil port T of the relief valve (16) returning oil into the oil tank (11); an oil port A of the electromagnetic reversing valve (17) being connected to a second flow channel (23), the second flow channel (23) being used to be connected to one of the oil inlet holes (81) of a differential pressure transmitter (8), an oil port B of the electromagnetic reversing valve (17) being connected to a first flow channel (22), the first flow channel (22) being used to be connected to another oil inlet hole (81) of the differential pressure transmitter (8), and a throttle valve (18) being connected between the second flow channel (23) and the first flow channel (22).

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