Detection device and detection method for a swash plate type piston hydraulic motor

Abstract

The present disclosure provides a detection device and method for a skew axis type plunger hydraulic motor, belonging to the technical field of hydraulic motor assembly detection. The detection device comprises a positioning assembly, a driving assembly and a detection assembly. The positioning assembly has a positioning plane parallel to the butt joint plane, which is used to butt joint with one end surface of the shell, and the positioning assembly is connected with the shell. The driving assembly is at least partially located in the positioning assembly and in contact with the oil distribution disc. The detection assembly is located on one side of the positioning assembly and connected with the positioning assembly. The detection assembly is used to detect the gap between the butt joint plane and the positioning plane when the spring seat moves to the limit position towards the center plunger and when the spring seat moves to the limit position away from the center plunger. The present disclosure can improve the detection accuracy of the center plunger gap.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of hydraulic motor assembly detection, and particularly relates to a detection device and a detection method for a slant-shaft plunger hydraulic motor. BACKGROUND

[0002] The slant-shaft plunger hydraulic motor refers to a hydraulic motor in which the cylinder body axis and the transmission shaft axis intersect at a certain angle. The slant-shaft plunger hydraulic motor includes a shell, a cylinder body, a plurality of plungers, an oil distribution disc, a transmission shaft, and the like. The cylinder body is located in the shell. The cylinder body has a plurality of plunger holes for mounting the plungers. Each plunger is movably located in a corresponding plunger hole and is connected to the transmission shaft through a ball joint. The plunger hole coaxial with the cylinder body axis is the central plunger hole. The plunger in the central plunger hole is the central plunger. The oil distribution disc and the transmission shaft are located on opposite sides of the cylinder body. The spring seat is located in the central plunger hole and is located at one end of the central plunger close to the oil distribution disc. The spring seat is in contact with the oil distribution disc. The spring is located inside the central plunger, one end of the spring abuts the inner bottom of the central plunger, and the other end of the spring abuts the spring seat. By adjusting the thickness of the spring seat, the central plunger gap (the gap between the central plunger and the spring seat) can be adjusted, so that the pre-compression force of the spring is always within a certain range, so as to provide a certain pre-compression force and balance the stress of the cylinder body.

[0003] In related technologies, when detecting the central plunger gap, a torque wrench is generally connected to the transmission shaft. When the wrench rotates the transmission shaft, the pre-compression force of the spring is indirectly detected by detecting the torque value of the wrench. The greater the torque value, the greater the pre-compression force of the spring.

[0004] However, the above detection method is not intuitive, is easily disturbed, and has low accuracy. SUMMARY

[0005] The present disclosure provides a detection device and a detection method for a slant-shaft plunger hydraulic motor, which can improve the detection accuracy of the central plunger. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a detection device for a helical axis piston hydraulic motor. The detection device is used for detecting the center piston gap of the helical axis piston hydraulic motor. The helical axis piston hydraulic motor comprises a shell, an oil distribution disc, a center piston, a spring and a spring seat. The cylinder is located in the shell. The oil distribution disc is located on one side of the cylinder. The cylinder has a center piston hole. The center piston and the spring seat are located in the center piston hole. The spring seat is located on one end of the center piston close to the oil distribution disc. The spring is located in the center piston. One end of the spring is in abutment with the inner bottom of the center piston. The other end of the spring is in abutment with the spring seat. The oil distribution disc has a butt joint plane on the end away from the spring seat. The detection device comprises a positioning assembly, a driving assembly and a detection assembly. The positioning assembly has a positioning plane. The positioning plane is parallel to the butt joint plane. The positioning plane is used for butt joint with one end surface of the shell. The positioning assembly is connected with the shell. The driving assembly is at least partially located in the positioning assembly and is in contact with the oil distribution disc. The driving assembly is used for driving the oil distribution disc to move along the axis of the center piston so that the spring seat moves along the axis of the center piston. The detection assembly is located on one side of the positioning assembly and is connected with the positioning assembly. The detection assembly is used for detecting the gap between the butt joint plane and the positioning plane when the spring seat moves to the limit position towards the center piston and when the spring seat moves to the limit position away from the center piston.

[0007] In another implementation manner of the present disclosure, the positioning assembly comprises a positioning plate and a positioning rod. The plate surface of the positioning plate towards the shell is the positioning plane. The positioning plate has a center hole. The middle part of the positioning rod is located in the center hole. One end of the positioning rod is located in the center piston. The other end of the positioning rod is located on the side of the positioning plate away from the oil distribution disc. The positioning rod is coaxial with the center piston. The driving assembly is partially located in the center hole and is sleeved on the outside of the positioning rod.

[0008] In another implementation manner of the present disclosure, the driving assembly is a nut. The positioning rod is a screw rod. The nut is threadedly connected with the screw rod.

[0009] In another implementation manner of the present disclosure, the middle part of the positioning rod has a shaft shoulder. The shaft shoulder is clamped with the oil distribution disc.

[0010] In another implementation manner of the present disclosure, the detection assembly comprises a dial indicator. The measuring rod of the dial indicator is connected with the surface of the oil distribution disc towards the positioning plane.

[0011] In another implementation of the present disclosure, an adjusting assembly is further included, which is located in the cylinder body and between the spring seat and the oil distribution disc, and at least partially located in the central plunger hole and abutting against the spring seat, and detachably connected with the cylinder body.

[0012] In another implementation of the present disclosure, the adjusting assembly includes an adjusting sleeve and an adjusting ring, the adjusting sleeve is coaxial with the central plunger and is threadedly connected with the cylinder body, the first end of the adjusting sleeve abuts against the spring seat, the second end of the adjusting sleeve faces the oil distribution disc, and the outer wall of the adjusting sleeve near the second end has a flange; the adjusting ring is detachably sleeved outside the adjusting sleeve and clamped between the flange and the cylinder body.

[0013] In another implementation of the present disclosure, a detection method for the oblique shaft plunger hydraulic motor is further provided, which is completed by the detection device described above, and includes the following steps: abutting the positioning assembly and the end face of the shell of the oblique shaft plunger hydraulic motor together through the positioning plane, and the positioning plane is parallel to the abutting plane; assembling the driving assembly on the positioning assembly and making the driving assembly contact with the oil distribution disc of the oblique shaft plunger hydraulic motor; assembling the detection assembly on one side of the positioning assembly; driving the oil distribution disc to move through the driving assembly, so that the gap between the abutting plane and the positioning plane is detected through the detection assembly when the central plunger moves to the limit position towards the spring seat and moves to the limit position away from the spring seat; and obtaining the central plunger gap according to the gap between the abutting plane and the positioning plane.

[0014] In another implementation of the present disclosure, the detection device further includes an adjusting assembly, which is located in the cylinder body and between the spring seat and the oil distribution disc, and at least partially located in the central plunger hole and abutting against the spring seat, and connected with the cylinder body; the detection method further includes: when the central plunger gap is greater than the required value, installing the adjusting assembly in the cylinder body and between the central plunger and the spring seat to adjust the central plunger gap; and re-detecting the central plunger gap.

[0015] In yet another implementation manner of the present disclosure, the adjusting assembly comprises an adjusting sleeve and an adjusting ring, the adjusting sleeve is coaxial with the center plunger and is threadedly connected with the cylinder body, a first end of the adjusting sleeve is in abutment with the spring seat, a second end of the adjusting sleeve is towards the oil distribution disc, and an outer wall of the adjusting sleeve close to the second end has a flange; the adjusting ring is detachably sleeved outside the adjusting sleeve and is clamped between the flange and the cylinder body; the detection method further comprises: after the adjusting assembly is installed, and when the detected center plunger gap is greater than the required value, thinning the adjusting ring in the adjusting assembly, and installing the thinned adjusting ring and the adjusting sleeve in the cylinder body and between the center plunger and the spring seat; or, after the adjusting assembly is installed, and when the detected center plunger gap is less than the required value, replacing the adjusting ring with an adjusting ring with a greater thickness, and installing the adjusting ring with the greater thickness and the adjusting sleeve in the cylinder body and between the center plunger and the spring seat.

[0016] The technical scheme provided by the embodiments of the present disclosure has the following beneficial effects:

[0017] When the detection device provided by the embodiments of the present disclosure is used to detect the center plunger gap, the detection device comprises a positioning assembly, and the positioning assembly has a positioning plane for abutting against one end surface of the shell, so that the detection assembly can be assembled on the side of the shell away from the transmission shaft (that is, after the rear cover is detached from the shell, the detection assembly is assembled on the shell), and the oil distribution disc can be limited in the cylinder body by the positioning plane.

[0018] In addition, the detection assembly comprises a driving assembly, the driving assembly is in contact with the oil distribution disc of the inclined shaft type plunger hydraulic motor, and the driving assembly is used to drive the oil distribution disc to move along the axis of the center plunger so that the spring seat moves along the axis of the center plunger. When the driving assembly drives the oil distribution disc to move towards the spring seat, the oil distribution disc pushes the cylinder body to move because the oil distribution disc is in contact with the spherical surface of the cylinder body, the cylinder body moves with the spring seat, and the spring seat is pressed after moving, thereby increasing the compression force of the spring. Until the spring seat cannot continue to move because the end surface of the spring seat abuts against the center plunger, that is, the center plunger gap is the smallest, and the compression force of the spring is the largest. Conversely, when the driving assembly drives the oil distribution disc to move away from the spring seat, the oil distribution disc moves away from the cylinder body, and the oil distribution disc stops moving because it is in contact with the positioning plane. At the same time, the cylinder body and the spring seat move towards the oil distribution disc under the action of the compression force of the spring, the compression force of the spring decreases, and until the cylinder body cannot continue to move because it abuts against the oil distribution disc again. At this time, the spring seat moves to the limit position away from the center plunger, the gap between the spring seat and the center plunger is the largest, and the compression force of the spring is the smallest.

[0019] Because the detection assembly is located at one side of the positioning assembly and connected with the positioning assembly, the detection assembly is used to detect the gap between the oil distribution disc and the positioning plane when the spring seat moves towards the center plunger to the limit position and when the spring seat moves away from the center plunger to the limit position. In this way, when the spring seat moves towards the center plunger to the limit position (i.e. the center plunger gap is the largest), because the driving assembly drives the oil distribution disc to move towards the spring seat until it cannot continue to move, at this time, the gap between the docking plane and the positioning plane detected by the detection assembly is the maximum value. When the spring seat moves away from the center plunger to the limit position (i.e. the center plunger gap is the smallest), because the driving assembly drives the oil distribution disc to move away from the spring seat until the docking plane is docked with the positioning plane, the spring seat moves towards the oil distribution disc under the action of the spring until it cannot move, at this time, the gap between the docking plane and the positioning plane detected by the detection assembly is the minimum value and is zero. It can be seen that the maximum value of the gap between the docking plane and the positioning plane is exactly the size of the center plunger gap.

[0020] The above detection device can conveniently and scientifically detect the center plunger gap, and the detection process is convenient and simple. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a helical axis type plunger hydraulic motor;

[0023] Figure 2 is Figure 1 is an enlarged view of C in

[0024] Figure 3 is a use state diagram of the detection device provided by the embodiments of the present disclosure;

[0025] Figure 4 is Figure 3 is the A view of

[0026] Figure 5 is Figure 3 is an enlarged view of B in

[0027] The meanings of the symbols in the drawings are as follows:

[0028] 101, housing; 102, cylinder; 103, plunger; 1031, center plunger; 104, oil distribution plate; 1040, butt joint plane; 1041, oil distribution plate body; 1042, ring plate; 1043, cylinder body; 105, transmission shaft; 106, spring; 107, spring seat; 108, ball head;

[0029] 1, positioning assembly; 10, positioning plane; 11, positioning plate; 12, positioning rod; 121, shaft shoulder;

[0030] 2, drive assembly; 20, positioning step; 21, gasket;

[0031] 3, detection assembly; 31, dial indicator; 32, fixed seat;

[0032] 5, adjustment assembly; 51, adjustment sleeve; 52, adjustment ring; 521, limiting part; 522, plug-in part; 510, flange. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings.

[0034] The oblique shaft plunger hydraulic motor refers to a hydraulic motor in which the cylinder axis and the transmission shaft axis intersect at a certain angle.

[0035] Figure 1 is a structural schematic diagram of the oblique shaft plunger hydraulic motor, see Figure 1The oblique shaft type piston hydraulic motor includes a housing 101, a cylinder body 102, a plurality of pistons 103, a distribution plate 104, a transmission shaft 105, and a front cover (not shown) and a rear cover (not shown). The front cover and the rear cover are respectively connected to two ends of the housing 101. The cylinder body 102 is located in the housing 101. The cylinder body 102 has a plurality of piston holes for mounting the pistons 103. Each piston 103 is movably located in the corresponding piston hole, and one end of the piston 103 is hinged to the transmission shaft 105 through a ball head 108. The distribution plate 104 and the transmission shaft 105 are respectively located on opposite sides of the cylinder body 102. The piston hole coaxial with the axis of the cylinder body 102 is the central piston hole. The piston 103 in the central piston hole is the central piston 1031. The distribution plate 104 serves to distribute flow and support the cylinder body 102. A spring seat 107 is located in the central piston hole and is located at one end of the central piston 1031 close to the distribution plate 104. A spring 106 is located inside the central piston 1031, one end of the spring 106 abuts the inner bottom of the central piston 1031, and the other end of the spring 106 abuts the spring seat 107. The distribution plate 104 is clamped between the rear cover and the cylinder body 102, and the distribution plate 104 and the cylinder body 102 are in spherical contact. The transmission shaft 105 is rotatably connected to the front cover. The end face of the distribution plate 104 away from the spring seat 107 is a butt joint plane 1040, which is used for butt joint of the rear cover.

[0036] The rear cover is provided with an oil inlet and an oil outlet. When hydraulic oil is input into the oil inlet, the hydraulic oil enters one or more of the plurality of piston holes after passing through the distribution plate 104 and pushes the corresponding piston 103 to move along its own axis. Since the piston 103 is hinged to the transmission shaft 105 through the ball head 108, when the piston 103 moves along its own axis direction and towards the transmission shaft under the action of the pressure oil, the piston 103 will be subjected to an axial leftward force F, which can be decomposed into two components, one being a first component perpendicular to the axis direction of the transmission shaft, and the other being a second component parallel to the direction of the transmission shaft. The first component will make the transmission shaft 105 rotate to output torque. When the transmission shaft 105 rotates, the piston 103 will rotate synchronously, thereby driving the cylinder body 102 to rotate synchronously, so that the distribution plate 104 is re-distributed. For the detailed structure and working principle of the oblique shaft type piston hydraulic motor, please refer to the related technology (for example, the relevant content of the oblique shaft type piston hydraulic motor in the book “Hydraulic Pump and Hydraulic Motor Principle, Use and Maintenance” published by Chemical Industry Press), which will not be described here.

[0037] In the related art, the oblique shaft type plunger hydraulic motor adopts a spherical oil distribution disc 104 and a support mode of a center plunger 1031. The oil distribution disc 104 plays a dual role of flow distribution and bearing of a cylinder body 102. Therefore, in the design and assembly, it is necessary to pay attention to maintaining the force balance of the cylinder body 102, that is, not only to ensure that the end surface of the cylinder body 102 is tightly attached to the oil distribution disc 104, but also to make the oil distribution disc 104 be in a good lubrication condition and an appropriate extrusion stress state. Inside the oblique shaft type plunger hydraulic motor, the hydraulic pressure pressing force presses the cylinder body 102 to the oil distribution disc 104, and the hydraulic bearing force pushes the cylinder body 102 away from the oil distribution disc 104. A spring 106 and a spring seat 107 are arranged in the center plunger 1031 located in the center of the cylinder body 102 (the center plunger hole), so that the center plunger gap and the pre-compression force of the spring 106 are always within a certain range. The spring 106 is used to provide a certain pre-compression force and balance the stress of the cylinder body 102. One end of the spring 106 abuts against the bottom of the center plunger 1031, and the other end of the spring 106 abuts against the spring seat 107. The spring seat 107 is in contact with the oil distribution disc 104.

[0038] In combination Figure 2 , by adjusting the thickness of the spring seat 107 along the plunger axis direction, the center plunger gap (the gap between the center plunger 1031 and the spring seat 107) can be adjusted, so that the pre-compression force of the spring 106 is always within a certain range, so as to provide a certain pre-compression force and balance the stress of the cylinder body 102.

[0039] The embodiments of the present disclosure provide a detection device for an oblique shaft type plunger hydraulic motor, as shown in Figure 3 The detection device is used for detecting the center plunger gap of the oblique shaft type plunger hydraulic motor.

[0040] The detection device comprises a positioning assembly 1, a driving assembly 2 and a detection assembly 3. The positioning assembly 1 has a positioning plane 10, which is parallel to a butt joint plane 1040. The positioning plane 10 is used for butt joint with the end surface of one end of the shell 101 of the oblique shaft type plunger hydraulic motor, and the positioning assembly 1 is connected with the shell 101 of the oblique shaft type plunger hydraulic motor.

[0041] At least part of the driving assembly 2 is located in the positioning assembly 1 and is in contact with the oil distribution disc 104 of the oblique shaft type plunger hydraulic motor. The driving assembly 2 is used for driving the oil distribution disc 104 to move along the axis of the center plunger 1031, so that the spring seat 107 moves along the axis of the center plunger 1031. The detection assembly 3 is located on one side of the positioning assembly 1 and is connected with the positioning assembly 1. The detection assembly 3 is used for detecting the gap between the butt joint plane 1040 and the positioning plane 10 when the center plunger 1031 moves to the limit position towards the spring seat 107 and moves to the limit position away from the spring seat 107.

[0042] In the detection device provided by the embodiments of the present disclosure, since the detection device comprises the positioning assembly 1, and the positioning assembly 1 has the positioning plane 10 used for facing the one end of the shell 101, the detection assembly can be assembled on the side of the shell 101 away from the transmission shaft 105 (that is, the detection assembly is assembled on the shell 101 after the rear cover is removed from the shell 101) through the positioning plane 10, and the oil distribution disc 104 can be limited in the cylinder body 102 through the positioning plane 10.

[0043] Since the detection assembly comprises the driving assembly 2, and the driving assembly 2 is in contact with the oil distribution disc of the inclined-shaft plunger hydraulic motor, the driving assembly 2 is used to drive the oil distribution disc to move along the axis of the central plunger so that the spring seat 107 moves along the axis of the central plunger 1031. Thus, when the driving assembly 2 drives the oil distribution disc 104 to move towards the spring seat 107, since the oil distribution disc 104 is in spherical contact with the cylinder body 102, the oil distribution disc 104 pushes the cylinder body 102 to move, and the cylinder body 102 moves with the spring seat 107, and the spring seat 107 moves to press the spring 106 and increase the compression force of the spring 106 until the spring seat 107 cannot continue to move because the end surface of the spring seat 107 abuts against the end surface of the central plunger 1031, that is, the spring seat 107 moves to the limit position towards the central plunger 1031, at this time, the central plunger gap is the smallest, and the central plunger gap is 0, that is, the compression force of the spring 106 is the largest. Conversely, when the driving assembly 2 drives the oil distribution disc 104 to move away from the spring seat 107, the oil distribution disc 104 moves away from the cylinder body 102, and the oil distribution disc 104 stops moving because it is in contact with the positioning plane 10. At the same time, the cylinder body 102 and the spring seat 107 move towards the oil distribution disc 104 under the compression force of the spring 106, the compression force of the spring 106 decreases, and the cylinder body 102 cannot continue to move because it abuts against the oil distribution disc 104 again. At this time, the spring seat 107 moves to the limit position away from the central plunger 1031, the gap between the spring seat 107 and the central plunger 1031 is the largest, and the compression force of the spring 106 is the smallest.

[0044] Since the detection assembly 3 is located on one side of the positioning assembly 1 and connected with the positioning assembly 1, the detection assembly 3 is used to detect the gap between the oil distribution disc and the positioning plane 10 when the spring seat 107 moves to the limit position towards the central plunger 1031 and when the spring seat 107 moves to the limit position away from the central plunger 1031. Thus, when the spring seat 107 moves to the limit position towards the central plunger 1031 (that is, when the central plunger gap is the largest), since the driving assembly 2 drives the oil distribution disc 104 to move towards the spring seat 107 until it cannot continue to move, at this time, the detection assembly 3 detects the gap between the abutting plane 1040 and the positioning plane 10 (see FIG. 6), and the detection assembly 3 detects the gap between the abutting plane 1040 and the positioning plane 10 (see FIG. 7) when the spring seat 107 moves to the limit position away from the central plunger 1031. Figure 3The gap d between the abutment plane 1040 and the positioning plane 10 is the maximum value. When the spring seat 107 moves away from the center plunger 1031 to the limit position (that is, the center plunger gap is the minimum value), due to the driving assembly 2 driving the oil distribution disc 104 to move away from the spring seat 107 until the abutment with the positioning plane 10 is together, the spring seat 107 moves towards the oil distribution disc 104 under the action of the spring 106 until it cannot move, at this time, the gap between the abutment plane 1040 and the positioning plane 10 detected by the detection assembly 3 is the minimum value and is 0. It can be seen that the maximum value of the gap between the abutment plane 1040 and the positioning plane 10 is exactly the size of the center plunger gap.

[0045] The above detection device can conveniently and scientifically detect the center plunger gap, and the detection process is convenient and simple.

[0046] The abutment mentioned above refers to the close fit and fixation of two planes.

[0047] Optionally, the positioning assembly 1 includes a positioning plate 11 and a positioning rod 12, and a plate surface of the positioning plate 11 facing the shell 101 is the positioning plane 10.

[0048] The positioning plate 11 has a center hole, the middle part of the positioning rod 12 is located in the center hole, one end of the positioning rod 12 is located in the center plunger 1031, the other end of the positioning rod 12 is located on the side of the positioning plate 11 away from the oil distribution disc 104, and the positioning rod 12 is coaxial with the center plunger 1031. The driving assembly 2 is partially located in the center hole and is sleeved outside the positioning rod 12.

[0049] In the above implementation manner, the positioning plate 11 is used to form the positioning plane 10, so as to limit the movement of the oil distribution disc 104 out of the shell 101 by the mutual abutment of the positioning plane 10 and the abutment plane 1040 of the oil distribution disc 104. At the same time, the positioning plate 11 is also used to be connected with the shell 101, so that the detection device can be installed on the shell 101 of the hydraulic motor. The positioning rod 12 is used to provide an installation basis for the driving assembly 2, and also can make the driving assembly 2 only move along the axis of the center plunger 1031 when pushing the oil distribution disc 104 to move, and will not deviate. Moreover, the positioning rod 12 can make the driving assembly 2 and the center plunger 1031 concentric.

[0050] Figure 4 is Figure 3 A view of Figure 4In the embodiment, the positioning plate 11 is a cross flange plate, and a plurality of positioning holes are arranged on the outer periphery of the positioning plate 11 in a circumferential direction, and the positioning holes are used to match with the positioning pins on the shell 101. The positioning pins are inserted into the positioning holes and are fixed in the positioning plate 11 and the shell 101 by nuts or other fasteners, so that the positioning plate 11 and the shell 101 can be detachably connected. Moreover, the positioning plate 11 is arranged in a cross shape, so that four L-shaped accommodation spaces can be formed by the cross flange plate, so that the detection assembly 3 can be fixed on the positioning plate 11, and the detection head of the detection assembly 3 can be connected to the positioning plane 10 of the positioning plate 11 after passing through the L-shaped accommodation space, which is convenient for detection.

[0051] The opposite two plate surfaces of the positioning plate 11 are both finished planes, and the flatness and parallelism accuracy is high, so that the positioning plane 10 in the positioning plate 11 can be attached to the flange plane corresponding to the shell 101 to determine the reference plane.

[0052] In other examples, the positioning assembly 1 can also have other structures, such as not arranging the positioning rod, but only arranging the positioning plate 11 with the positioning plane.

[0053] Continuing to refer to 3 and Figure 4 Optionally, the driving assembly 2 is a nut, and the positioning rod 12 is a screw rod, and the driving assembly 2 is threadedly connected with the positioning rod 12.

[0054] In the above implementation manner, the driving assembly 2 is arranged as a nut, and the positioning rod 12 is arranged as a screw rod, so that the driving assembly 2 can move along the axis of the positioning rod 12 by the thread cooperation between the nut and the positioning rod 12, so as to push the oil distribution disc 104 to move.

[0055] In the embodiment, the positioning rod 12 and the driving assembly 2 are arranged in a threaded connection, because the threaded connection can facilitate the control of the axial displacement of the driving assembly 2, and thus the detection accuracy of the detection and adjustment device is improved.

[0056] In other examples, the driving assembly 2 can also have other structures, such as a cylindrical block. As long as the cylindrical block is located in the center hole of the positioning plate 11, the cylindrical block can be directly pushed to move in the center hole of the positioning plate 11 to drive the oil distribution disc 104 to move. However, it is not easy to accurately control the movement stroke of the cylindrical block. Because the gap of the center plunger is generally within 0.4 mm, that is, the movement stroke of the cylindrical block will not be greater than 0.4 mm. In such a small stroke, it is easy to exceed 0.4 mm by directly pushing the cylindrical block, so that the stroke of the cylindrical block is greater than 0.4 mm. In this way, the oil distribution disc 104 or other parts may be damaged.

[0057] In this embodiment, the middle part of the outer wall of the nut has a positioning step 20. In this way, an external rotating tool or the like can be clamped on the positioning step 20 to rotate the nut by the external rotating tool.

[0058] In addition, a gasket groove is arranged on the side of the oil distribution disc 104 facing the positioning plate 11 and close to the outer periphery of the positioning rod 12. The gasket 21 is sleeved on the outside of the positioning rod 12 and clamped between the nut and the oil distribution disc 104, and part of the gasket 21 is located in the gasket groove. In this way, wear or the like between the nut and the oil distribution disc 104 can be prevented by the gasket 21. The gasket 21 is a polytetrafluoroethylene structure, which can further prevent the nut from damaging the oil distribution disc 104.

[0059] Optionally, the middle part of the positioning rod 12 has a shaft shoulder 121, which is clamped with the oil distribution disc 104.

[0060] In order to enable the positioning rod 12 to be quickly positioned in the central plunger, the oil distribution disc 104 includes an oil distribution disc body 1041, a ring plate 1042 and a cylinder body 1043. The inside of the oil distribution disc body 1041 has a through hole, and the ring plate 1042 and the cylinder body 1043 are coaxially located in the through hole. The ring plate 1042 and the side of the oil distribution disc body 1041 facing the spring seat 107 are integrated to form a smooth spherical surface. The cylinder body 1043 is located on the side of the ring plate 1042 away from the spring seat 107, and one end of the cylinder body 1043 is connected with the ring plate 1042, and the other end of the cylinder body 1043 abuts against the shaft shoulder 121. In this way, the shaft shoulder 121 can abut against the inside of the oil distribution disc 104, so as to facilitate the positioning and installation of the positioning rod 12.

[0061] In other examples, the positioning between the positioning rod 12 and the oil distribution disc 104 can also be achieved by other positioning structures, for example, the positioning rod 12 and the positioning plate 11 are detachably connected together by a connecting piece or the like.

[0062] Optionally, the detection assembly 3 includes a dial gauge 31, and the measuring rod of the dial gauge 31 is connected with the side of the oil distribution disc 104 facing the positioning plane 10.

[0063] In the above implementation manner, the dial gauge 31 can quickly and conveniently detect the gap between the oil distribution disc and the positioning plane.

[0064] In other examples, the number of dial gauges 31 can be multiple, and the multiple dial gauges 31 are arranged on the positioning plate 11 in a circumferential interval with the positioning rod 12 as the shaft.

[0065] When multiple dial gauges 31 are used to simultaneously detect the gap between the abutting plane 1040 and the positioning plane 10, the average value of the detection results of the multiple dial gauges 31 can be taken as the final detection result. In this way, the detection accuracy can be further improved.

[0066] In use, initially, the positioning planes 10 of the positioning plate 11 are respectively in close contact with the oil distribution plate 104 and the shell 101. When the nut is tightened, the gasket 21, the oil distribution plate 104 and the spring seat 107 move along the positioning rod 12 towards the inside of the shell 101, and the spring 106 is compressed until the spring seat 107 is in complete close contact with the center plunger 1031, and the center plunger gap is zero.

[0067] To detect the center plunger gap, the dial gauge 31 is fixed on the positioning plate 11, and the detection head of the measuring rod of the dial gauge 31 is in close contact with the abutting plane 1040 of the oil distribution plate 104 after passing through the cross-shaped space of the positioning plate 11, and is set to zero.

[0068] When the nut is loosened, the compressed spring 106 is elongated, and the spring seat 107, the oil distribution plate 104 and the gasket 21 move along the positioning rod 12 towards the outside of the shell 101, and the detection head of the dial gauge 31 moves synchronously with the oil distribution plate 104 until the abutting plane 1040 of the oil distribution plate 104 abuts against the positioning plane 10. At this time, even if the nut is continuously loosened, the oil distribution plate 104 is still limited by the positioning plate 11, and the reading of the dial gauge 31 is the center plunger gap.

[0069] Optionally, the detection assembly 3 further comprises a fixing seat 32, which is connected to the side of the positioning plate 11 away from the oil distribution plate 104, and the fixing seat 32 is connected to the dial gauge 31.

[0070] In the above implementation manner, the fixing seat 32 is used to provide a mounting basis for the dial gauge 31, so that the dial gauge 31 can be fixed on the positioning plate 11.

[0071] In this embodiment, the fixing seat 32 can be a seat body of any structure and any shape, as long as it can conveniently support and connect the dial gauge 31 on the positioning plate 11.

[0072] In other examples, the fixing seat 32 can also be an integral cast structure with the positioning plate 11.

[0073] That is, when assembling the detection assembly 3, the fixing seat 32 can be first fixed on the side of the positioning plate 11 away from the oil distribution plate 104, then the dial gauge 31 is connected to the fixing seat 32, and the measuring rod of the dial gauge 31 is located in the L-shaped containing space of the positioning plate 11, and the detection head of the measuring rod abuts against the positioning plane 10.

[0074] The detection device further comprises an adjusting assembly 5, which is located in the cylinder body 102 and between the spring seat 107 and the oil distribution plate 104. The adjusting assembly 5 is at least partially located in the center plunger hole and abuts against the spring seat 107, and the adjusting assembly 5 is detachably connected to the cylinder body 102. The adjusting assembly 5 is at least partially located in the center plunger hole and abuts against the spring seat 107, and the adjusting assembly 5 is detachably connected to the cylinder body 102.

[0075] In the above implementation, the adjusting assembly 5 is configured to detect that the center plunger gap is too large, and further reduce the center plunger gap, so that the center plunger gap can meet the requirements, avoiding disassembling the spring 106 and the spring seat 107 and adjusting the center plunger gap, simplifying the adjusting steps of the center plunger gap, and improving the work efficiency.

[0076] Optionally, the adjusting assembly 5 comprises an adjusting sleeve 51 and an adjusting ring 52. The adjusting sleeve 51 is coaxial with the center plunger 1031 and is threadedly connected with the cylinder body 102. The first end of the adjusting sleeve 51 abuts against the spring seat 107, and the second end of the adjusting sleeve 51 faces the oil distribution disc 104. The outer wall of the adjusting sleeve 51 close to the second end has a flange 510. The adjusting ring 52 is detachably sleeved outside the adjusting sleeve 51 and is clamped between the flange 510 and the cylinder body 102.

[0077] In the above implementation, the adjusting sleeve 51 is configured to be threadedly connected with the cylinder body 102, so as to be moved towards or away from the spring seat 107, thereby pressing the spring seat 107 to move or separating from the spring seat 107. The adjusting ring 52 is sleeved outside the adjusting sleeve 51 and is configured to limit the movement of the adjusting sleeve 51 in the cylinder body 102, so as to limit the depth of the adjusting sleeve 51 screwed into the cylinder body 102. Meanwhile, the adjusting ring 52 is detachably connected with the adjusting sleeve 51. Different thicknesses of the adjusting ring 52 can be replaced, so as to adjust the depth of the adjusting sleeve 51 screwed into the cylinder body 102, thereby adjusting the center plunger.

[0078] In the embodiment, the adjusting sleeve 51 is sleeved outside the positioning rod 12 and is in clearance fit with the positioning rod 12, so as to facilitate the positioning and installation of the adjusting sleeve 51. The outer wall of the adjusting sleeve 51 has a thread, and the corresponding position of the cylinder body 102 has an internal thread. The adjusting sleeve 51 is threadedly connected with the cylinder body 102. By rotating the adjusting sleeve 51, the depth of the adjusting sleeve 51 screwed into the cylinder body 102 (that is, the distance between the adjusting sleeve 51 and the positioning plane 10) can be adjusted.

[0079] Figure 5 is Figure 3 The enlarged view of B in FIG. 5 is shown in FIG. 6. Figure 5 Optionally, the adjusting sleeve 51 is a screw plug, and the outer peripheral wall of the adjusting sleeve 51 has a ring groove. The adjusting ring 52 is a metal ring, and the adjusting ring 52 comprises a ring-shaped limiting portion 521 and a ring-shaped insertion portion 522. The limiting portion 521 is sleeved outside the insertion portion 522. The insertion portion 522 is inserted into the ring groove. In order to facilitate the insertion of the adjusting ring 52 into the adjusting sleeve 51 and the synchronous movement of the adjusting ring 52 with the adjusting sleeve 51, one side of the insertion portion 522 facing the spring seat 107 is a first inclined surface, and the distance between the first inclined surface and the spring seat 107 gradually increases in the direction of the radial direction of the adjusting ring 52 inward. Correspondingly, the groove wall of the ring groove has a second inclined surface which is in abutment with the first inclined surface.

[0080] In other examples, the adjusting assembly 5 can also be other structures, such as an adjusting sleeve with a limiting flange. The adjusting sleeve is also screwed with the cylinder body. Only because the limiting flange is a structure of the adjusting sleeve itself, it cannot be changed at will, and naturally cannot change the depth of the adjusting sleeve 51 screwed into the cylinder body 102 by changing the position of the limiting flange. Unlike the structure above, the depth of the adjusting sleeve 51 screwed into the cylinder body 102 can be adjusted by replacing adjusting rings 52 of different thicknesses, so as to adjust the center plunger gap.

[0081] On the other hand, the embodiments of the present disclosure also provide a detection method for the oblique shaft type plunger hydraulic motor. The detection method is completed by the detection device described above, and the detection method comprises the following steps:

[0082] S601: The positioning assembly is abutted with the end face of the shell of the oblique shaft type plunger hydraulic motor through the positioning plane, and the positioning plane is parallel to the abutting plane.

[0083] S602: The driving assembly is assembled on the positioning assembly, and the driving assembly is in contact with the oil distribution plate of the oblique shaft type plunger hydraulic motor.

[0084] S603: The detection assembly is assembled on one side of the positioning assembly.

[0085] S604: The abutting plane and the positioning plane are detected by the detection assembly when the center plunger moves to the limit position towards the spring seat and moves to the limit position away from the spring seat by driving the oil distribution plate to move by the driving assembly.

[0086] S605: The center plunger gap is obtained according to the gap between the abutting plane and the positioning plane.

[0087] The above method has the same beneficial effects as the device described above, and will not be repeated here.

[0088] Optionally, the method further comprises:

[0089] S606: When the center plunger gap is greater than the required value, an adjusting assembly is installed in the cylinder body, and the adjusting assembly is located between the center plunger and the spring seat to adjust the center plunger gap.

[0090] S607: The center plunger gap is detected again.

[0091] S608: After the installation of the adjusting assembly, and when the detected center plunger gap is greater than the required value, the adjusting ring in the adjusting assembly is thinned, and the thinned adjusting ring and the adjusting sleeve are installed in the cylinder body and between the center plunger and the spring seat. Alternatively, after the installation of the adjusting assembly, and when the detected center plunger gap is less than the required value, the adjusting ring is replaced with an adjusting ring with a greater thickness, and the adjusting ring with the greater thickness and the adjusting sleeve are installed in the cylinder body and between the center plunger and the spring seat.

[0092] After measuring the center plunger gap value, the general method is to directly disassemble the internal spring seat, and then reassemble after making the thickness according to the detected size. However, since the spring seat 107 is installed inside the cylinder body 102, the disassembly and assembly work is large and inefficient. To overcome this drawback, the external adjusting sleeve 51 and the adjusting ring 52 are used to replace the internal spring seat 107 to adjust the center plunger gap, without disassembling the spring seat 107 from the inside of the cylinder body 102, greatly improving the detection and assembly efficiency.

[0093] If the measured center plunger gap is less than the required value, the adjusting sleeve 51 is disassembled, the adjusting ring 52 is removed, and the adjusting ring 52 is replaced with a thicker adjusting ring 52, and then the adjusting sleeve 51 is reassembled. At this time, it is equivalent to moving the spring seat 107 outwardly of the housing 101, and the center plunger gap becomes larger.

[0094] Conversely, if the measured center plunger gap is greater than the required value, the adjusting sleeve 51 is disassembled, the adjusting ring 52 is removed, and the adjusting ring 52 is thinned and then the adjusting sleeve 51 is reassembled. At this time, it is equivalent to moving the spring seat 107 inwardly of the housing 101, and the center plunger gap becomes larger.

[0095] After replacing the adjusting ring 52, the center plunger gap is re-measured, and after confirming that the requirement is met, the detection device is disassembled, and the rear cover is assembled.

[0096] The above only describes optional embodiments of the present disclosure, and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A detection device for a helical-axle piston hydraulic motor, characterized by, The detection device is used for detecting the center plunger gap of the inclined shaft plunger hydraulic motor, the inclined shaft plunger hydraulic motor comprises a shell (101), an oil distribution disc (104), a center plunger (1031), a spring (106) and a spring seat (107), a cylinder (102) is located in the shell (101), the oil distribution disc (104) is located on one side of the cylinder (102), the cylinder (102) has a center plunger hole, the center plunger (1031) and the spring seat (107) are located in the center plunger hole, and the spring seat (107) is located at one end of the center plunger (1031) close to the oil distribution disc (104), the spring (106) is located in the center plunger (1031), one end of the spring (106) abuts against the inner bottom of the center plunger (1031), the other end of the spring (106) abuts against the spring seat (107), and the oil distribution disc (104) has a butt joint plane (1040) at an end away from the spring seat (107); The detection device comprises a positioning assembly (1), a driving assembly (2) and a detection assembly (3); The positioning assembly (1) has a positioning plane (10), the positioning plane (10) is parallel to the butt joint plane, the positioning plane (10) is used for facing the one end surface of the shell (101), and the positioning assembly (1) is connected with the shell (101); The driving assembly (2) is at least partially located in the positioning assembly (1) and in contact with the oil distribution disc (104), and the driving assembly (2) is used for driving the oil distribution disc (104) to move along the axis of the center plunger (1031) so that the spring seat (107) moves along the axis of the center plunger (1031); The detection assembly (3) is located on one side of the positioning assembly (1) and connected with the positioning assembly (1), and the detection assembly (3) is used for detecting the gap between the butt joint plane (1040) and the positioning plane (10) when the spring seat (107) moves to the limit position towards the center plunger (1031) and when the spring seat (107) moves to the limit position away from the center plunger (1031) respectively.

2. The detection device of claim 1, wherein, The positioning assembly (1) comprises a positioning plate (11) and a positioning rod (12), and one plate surface of the positioning plate (11) facing the shell (101) is the positioning plane (10); The positioning plate (11) has a center hole, the middle part of the positioning rod (12) is located in the center hole, one end of the positioning rod (12) is located in the center plunger (1031), and the other end of the positioning rod (12) is located on the side of the positioning plate (11) away from the oil distribution disc (104), and the positioning rod (12) is coaxial with the center plunger (1031); The driving assembly (2) is partially located in the center hole and sleeved on the outside of the positioning rod (12).

3. The detection device of claim 2, wherein, The driving assembly (2) is a nut, and the positioning rod (12) is a screw rod, and the nut is threadedly connected with the screw rod.

4. The detection device of claim 2, wherein, The middle part of the positioning rod (12) is provided with a shaft shoulder (121), and the shaft shoulder (121) is clamped with the oil distribution disc (104).

5. The detection device according to any one of claims 1 to 4, characterized in that The detection assembly (3) comprises a dial indicator (31), and a measuring rod of the dial indicator (31) is connected with one side of the oil distribution disc (104) facing the positioning plane (10).

6. The detection device according to any one of claims 1 to 4, characterized in that The detection device further comprises an adjusting assembly (5) located in the cylinder body (102) and between the spring seat (107) and the oil distribution disc (104), the adjusting assembly (5) is at least partially located in the center plunger hole and abuts against the spring seat (107), and the adjusting assembly (5) is detachably connected with the cylinder body (102).

7. The detection device of claim 6, wherein, The adjusting assembly (5) comprises an adjusting sleeve (51) and an adjusting ring (52), the adjusting sleeve (51) is coaxial with the center plunger (1031) and is threadedly connected with the cylinder body (102), a first end of the adjusting sleeve (51) abuts against the spring seat (107), a second end of the adjusting sleeve (51) faces the oil distribution disc (104), and an outer wall of the adjusting sleeve (51) close to the second end is provided with a flange (510). The adjusting ring (52) is detachably sleeved outside the adjusting sleeve (51) and clamped between the flange (510) and the cylinder body (102).

8. A detection method for a helical-axle piston hydraulic motor, characterized by, The detection method is completed by the detection device of claim 1, and the detection method comprises the following steps: The positioning assembly is abutted together with an end surface of a housing of the inclined shaft type plunger hydraulic motor through the positioning plane, and the positioning plane is parallel to the abutment plane; The driving assembly is assembled on the positioning assembly, and the driving assembly is in contact with the oil distribution disc of the inclined shaft type plunger hydraulic motor; The detection assembly is assembled on one side of the positioning assembly; The oil distribution disc is driven to move by the driving assembly, so that when the center plunger moves to the limit position towards the spring seat and moves to the limit position away from the spring seat, the gap between the abutment plane and the positioning plane is detected by the detection assembly; According to the gap between the abutment plane and the positioning plane, the center plunger gap is obtained.

9. The detection method according to claim 8, characterized in that, The detection device further comprises an adjusting assembly located in the cylinder body and between the spring seat and the oil distribution disc, the adjusting assembly is at least partially located in the center plunger hole and abuts against the spring seat, and the adjusting assembly is connected with the cylinder body; The detection method further comprises the following steps: When the center plunger gap is greater than a required value, the adjusting assembly is installed in the cylinder body and located between the center plunger and the spring seat, so as to adjust the center plunger gap; The center plunger gap is re-detected.

10. The detection method according to claim 9, characterized in that, The adjusting assembly comprises an adjusting sleeve coaxial with the center plunger and threaded with the cylinder body, a first end of the adjusting sleeve abutting against the spring seat, a second end of the adjusting sleeve facing the oil distribution disc, and an outer wall of the adjusting sleeve near the second end having a flange; The adjusting ring is detachably sleeved outside the adjusting sleeve and clamped between the flange and the cylinder body; The detection method further comprises: After the adjusting assembly is installed and the detected center plunger gap is greater than the required value, the adjusting ring in the adjusting assembly is thinned, and the thinned adjusting ring and the adjusting sleeve are installed in the cylinder body and located between the center plunger and the spring seat; Or, after the adjusting assembly is installed and the detected center plunger gap is less than the required value, the adjusting ring is replaced with an adjusting ring having a greater thickness, and the adjusting ring having the greater thickness and the adjusting sleeve are installed in the cylinder body and located between the center plunger and the spring seat.

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