A machining fixture and machining method for the inclined oil hole of a hydraulic steering valve

Abstract

The present invention discloses a processing fixture and a processing method for the inclined oil hole of a hydraulic steering gear rotary valve, which relates to the technical field of drilling fixtures and drilling methods, and includes a fixed part, a rotating part, a positioning pin and a positioning mechanism. The rotating part is provided with a circumferential limit surface and an axial limit surface that can abut against the rotary valve. The rotating part is rotatably arranged on the fixed part. The rotating part is provided with guide holes that are circumferentially arranged around the rotating axis of the rotating part and are coaxially opposite to the inclined oil holes to be processed in the rotary valve. The positioning pin can be detachably inserted into the guide hole and the first inclined oil hole after the drilling of the first inclined oil hole is completed, so as to locate the relative position of the guide hole and the remaining inclined oil holes to be processed in the rotary valve when the remaining inclined oil holes are processed, so as to solve the technical problems of low drilling efficiency and insufficient drilling accuracy when the inclined hole drilling jig in the prior art is used for drilling operations.

Description

Technical Field

[0001] The invention relates to the technical field of drilling fixtures and drilling methods, and in particular to a processing fixture and a processing method for an inclined oil hole of a rotary valve of a hydraulic steering gear. Background Art

[0002] As the main component of the hydraulic steering gear, the rotary valve continuously provides hydraulic assistance to the power chamber as the steering wheel turns, ensuring accurate wheel steering. In order to ensure accurate hydraulic assistance to the left and right chambers of the hydraulic steering gear, six oblique oil holes are designed on the rotary valve. The traditional processing method of the oblique oil holes is to process them on a radial drill, that is, the main shaft of the radial drill is rotated in advance according to the angle of the oblique oil holes, the rotary valve is clamped with a dividing head, and the rotating dividing head is used to process the six oblique oil holes on the circumference. First, pre-drill each hole with a positioning drill, and then use a twist drill to drill the oblique oil holes into place. During the manufacturing process, it is necessary to replace the positioning drill and the twist drill alternately. At the same time, the efficiency of processing on the radial drill is very low. The position accuracy of the inclined oil hole is also subject to factors such as the smooth outer circle of the rotary valve, the position of the pre-drilled hole of the positioning drill, the accuracy of the radial drill, and the accuracy of the dividing head. As a result, the inclined oil hole is not easy to process, and the processing position accuracy of the inclined oil hole is insufficient. If there is a deviation in the processing position accuracy of the inclined oil hole, it will cause uneven oil supply to the left and right during hydraulic steering, and produce abnormal noise of hydraulic flow, which will not only affect the driver's comfort, but more seriously affect the precise steering of the wheels.

[0003] In order to solve the problems of low machining efficiency and insufficient machining precision of the inclined oil hole of the traditional rotary valve, Chinese invention patent CN202023320383.0 discloses a plunger pump high pressure relief valve rotary valve inclined hole drilling jig, which relates to the field of drilling jigs. The plunger pump high pressure relief valve rotary valve inclined hole drilling jig comprises an inclined surface base and a threaded locking positioning inclined hole drilling jig ring, wherein the plunger pump high pressure relief valve rotary valve is arranged inside the threaded locking positioning inclined hole drilling jig ring, and a valve core hole is arranged at the end of the threaded locking positioning inclined hole drilling jig ring for positioning, and a rotary fixed mandrel is arranged inside the valve core hole.

[0004] When drilling holes with the above-mentioned inclined hole drilling jig, it is necessary to first introduce the stopped drill bit into the inclined hole of the threaded locking positioning inclined hole drilling jig ring, find the vertical position and then withdraw the drill bit. When drilling is required, turn on the drill bit rotation switch, and again introduce the high-speed rotating drill bit into the inclined hole of the threaded locking positioning inclined hole drilling jig ring to perform guided drilling. However, the above-mentioned drilling method is relatively cumbersome to operate. Once the number of holes to be drilled increases, the drilling efficiency will be seriously reduced. In addition, after finding the drilling position, the threaded locking positioning inclined hole drilling jig ring lacks effective positioning. During the drilling process, the threaded locking positioning inclined hole drilling jig ring may become loose, resulting in deviations in the drilling position and insufficient drilling accuracy. After the first inclined hole is processed, it is necessary to manually rotate the workpiece 180° around the rotating fixed mandrel to process another inclined hole. However, the rotation angle of the workpiece around the rotating fixed mandrel cannot be accurately positioned and can only be roughly estimated manually, thereby further reducing the drilling accuracy. Summary of the invention

[0005] In view of this, it is necessary to provide a processing fixture and processing method for the inclined oil hole of the hydraulic steering gear rotary valve to solve the technical problems of insufficient drilling accuracy and low drilling efficiency when using the inclined hole drilling template in the prior art for drilling operations.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a processing fixture for the inclined oil hole of a rotary valve of a hydraulic steering gear, comprising a fixed part, a rotating part, a positioning pin and a positioning mechanism, wherein the rotating part is provided with a circumferential limiting surface and an axial limiting surface capable of abutting against the rotary valve to position the relative position of the rotary valve and the rotating part, wherein the rotating part is rotatably arranged on the fixed part, and the rotating part is provided with guide holes which are circumferentially arranged around the rotating axis of the rotating part and are coaxially opposite to the inclined oil hole to be processed of the rotary valve, and the positioning mechanism comprises a limiting portion provided on the fixed part and a limiting portion provided on the rotating part and capable of being detachably connected to the limiting portion The positioning part is connected to the fixed part, which is used to switch the rotating connection and fixed connection state between the rotating part and the fixed part, so that the rotating part can rotate around the axis of the rotating part in the rotating connection state to switch the guide hole corresponding to the drill bit, and the drill bit can be coaxial with the guide hole and drill the rotary valve along the guide hole in the fixed connection state to form an inclined oil hole. The positioning pin can be detachably inserted in the guide hole and the first inclined oil hole after the drilling of the first inclined oil hole is completed to limit the relative rotation of the rotary valve and the rotating part, so as to locate the relative position of the guide hole and the remaining inclined oil holes to be processed in the rotary valve when the remaining inclined oil holes are processed.

[0007] In one embodiment, the rotating member is provided with a receiving groove for receiving the rotary valve, the inner circumferential wall of the receiving groove forms the circumferential limiting surface, the inner end surface of the receiving groove forms the axial limiting surface, and the guide hole is connected with the receiving groove, so that the drill bit can drill the rotary valve located in the receiving groove along the guide hole to form an inclined oil hole.

[0008] In one embodiment, the rotating member is provided with an inclined hole which is circumferentially arranged around the rotating axis of the rotating member and coaxially opposite to the inclined oil hole to be processed in the rotary valve, and a drill sleeve is fixed in the inclined hole, and the inner hole of the drill sleeve forms the guide hole.

[0009] In one embodiment, the fixing member is fixed with a guide cylinder, the positioning portion includes a positioning hole which is circumferentially arranged at the end of the rotating member and corresponds one-to-one to the guide hole, the limiting portion includes a positioning rod which is slidably arranged in the guide cylinder and whose axis is located on a motion trajectory at the center of the positioning hole, and the positioning rod can be plugged into the positioning hole to switch the rotational connection and fixed connection state between the rotating member and the fixing member.

[0010] In one of the embodiments, the rotating part is inclined relative to the horizontal plane so that the guide hole on the rotating part can be in a vertical direction when it rotates to a position coaxial with the drill bit. The outer contour of the cross-section of the rotating part is a regular polygon with a number of sides corresponding to the number of inclined oil holes of the rotary valve. The guide holes are respectively located on the plane of the outer periphery of the regular polygonal rotating part. The fixed part is provided with a bottom supporting surface and an end supporting surface respectively abutting against the plane of the outer periphery of the regular polygonal rotating part and the end face of the rotating part to support the rotating part.

[0011] In one of the embodiments, it also includes a bottom support member, a second spring and a locking member, the bottom supporting surface is the upper end surface of the bottom support member, the fixing member is provided with a guide groove, the bottom support member is slidably arranged in the guide groove, the second spring is respectively connected to the bottom support member and the fixing member to provide elastic force for the bottom support member to move upward, so that the bottom support member can rebound upward and be arranged on the fixing member, the locking member is arranged on the fixing member, the bottom support member is provided with a locking groove, the locking member is provided with a locking portion that can move laterally relative to the bottom support member and can be plugged in the locking groove to switch the sliding connection and fixed connection state between the bottom support member and the fixing member.

[0012] In one embodiment, the locking component includes a first bolt, the locking portion is a locking pin arranged at the end of the first bolt, the fixing component is provided with a first screw hole which is connected with the guide groove, the first bolt is screwed with the first screw hole, and when the first bolt is rotated, the locking pin can be driven to move laterally relative to the base support and can be plugged into the locking groove.

[0013] In one of the embodiments, it also includes an end limit piece and a locking piece. The end limit piece is detachably slidably arranged on the fixing piece and can move axially relative to the rotary valve placed in the accommodating groove. The locking piece is detachably connected to the end limit piece and the fixing piece to switch the sliding connection and fixed connection state between the end limit piece and the fixing piece. The end limit piece is provided with an abutment surface that can abut against the end face of the rotary valve, so that when the drill bit drills the rotary valve, the end limit piece is fixedly abutted against the end face of the rotary valve placed in the accommodating groove through the abutment surface to limit the axial relative movement of the rotary valve and the rotating part.

[0014] In one embodiment, the locking member includes a second bolt, the fixing member is provided with a slide groove, the end limit member is provided with a slide rail, the end limit member is slidably inserted in the slide groove through the slide rail, the fixing member is provided with a second screw hole, the end limit member is provided with a second through hole coaxially opposite to the second screw hole, the second bolt is passed through the second through hole, and is threadedly connected to the second screw hole.

[0015] A method for machining an inclined oil hole of a hydraulic steering gear rotary valve adopts the machining fixture of the inclined oil hole of a hydraulic steering gear rotary valve and comprises the following steps:

[0016] Step 1. Position the relative positions of the rotary valve and the rotating member through the circumferential limiting surface and the axial limiting surface, rotate the rotating member so that the drill bit and one of the guide holes of the rotating member are coaxially opposite to each other, connect the limiting part of the positioning mechanism with the positioning part, and switch the rotating member and the fixed member to a fixed connection state;

[0017] Step 2: Insert the drill bit into the guide hole and drill the rotary valve along the guide hole to form the first inclined oil hole;

[0018] Step 3. Remove the drill bit and insert the positioning pin into the guide hole and the first oblique oil hole to limit the relative rotation between the rotary valve and the rotating part;

[0019] Step 4. Separate the limiting part from the positioning part of the positioning mechanism, rotate the rotating part and the rotary valve, rotate the remaining guide holes in turn to a position coaxially opposite to the drill bit, and after switching the rotating part and the fixing part to a fixed connection state through the positioning mechanism, drill the remaining inclined oil holes.

[0020] Compared with the prior art, the present invention has the following beneficial effects: when the rotary valve is processed with the processing fixture of the inclined oil hole of the rotary valve of the hydraulic steering gear of the present invention, it is only necessary to first locate the relative position of the rotary valve and the rotating part through the circumferential limit surface and the axial limit surface, and rotate the rotating part, make the drill bit coaxially opposite to one of the guide holes of the rotating part, connect the limit part of the positioning mechanism with the positioning part, switch the rotating part and the fixed part to a fixed connection state, and then extend the drill bit into the guide hole and drill the rotary valve along the guide hole to form the first inclined oil hole, then withdraw the drill bit, insert the positioning pin into the guide hole and the first inclined oil hole, at this time, the rotary valve can rotate synchronously with the rotating part, and the axial relative position of the remaining guide hole and the rotary valve is the position of the remaining inclined oil hole to be processed, and the processing accuracy of the inclined oil hole is guaranteed. At the same time, when processing the remaining inclined oil holes, it is only necessary to rotate the rotating part and the rotary valve in sequence, and rotate the remaining guide holes in sequence to the coaxial relative position of the drill bit, so that the remaining inclined oil holes can be processed. The operation is very convenient and quick, and the drilling efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axonometric drawing of the present invention from a first viewing angle;

[0022] Figure 2 is an axonometric drawing of the second viewing angle of the present invention;

[0023] Figure 3 is a cross-sectional view of the present invention;

[0024] Figure 4 It is a working schematic diagram of the present invention. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0026] like Figures 1 to 3As shown, the present invention provides a processing fixture for the inclined oil hole of a hydraulic steering valve, including a fixed part 10, a rotating part 20, a positioning pin 30 and a positioning mechanism 40. The rotating part 20 is provided with a circumferential limiting surface and an axial limiting surface 211 that can abut against the rotary valve 100 to position the relative position of the rotary valve 100 and the rotating part 20. The rotating part 20 is rotatably arranged on the fixed part 10. The rotating part 20 is provided with a guide hole 22 that is circumferentially arranged around the rotation axis of the rotating part 20 and is coaxially opposite to the inclined oil hole 101 to be processed in the rotary valve 100. The positioning mechanism 40 includes a limiting portion provided on the fixed part 10 and a positioning portion provided on the rotating part 20 and capable of being detachably connected to the limiting portion, for The rotational connection and fixed connection states of the rotating member 20 and the fixed member 10 are switched, so that the rotating member 20 in the rotational connection state can rotate around the axis of the rotating member 20 to switch the guide hole 22 corresponding to the drill bit, and the drill bit in the fixed connection state can be coaxial with the guide hole 22 and drill the rotary valve 100 along the guide hole 22 to form an inclined oil hole 101. The positioning pin 30 can be detachably inserted in the guide hole 22 and the first inclined oil hole 101 after the drilling of the first inclined oil hole 101 is completed, so as to limit the relative rotation of the rotary valve 100 and the rotating member 20, so as to locate the relative position of the guide hole 22 and the remaining inclined oil holes 101 to be processed in the rotary valve 100 when the remaining inclined oil holes 101 are processed.

[0027] When the inclined oil hole 101 of the rotary valve 100 is processed by the processing fixture of the inclined oil hole of the rotary valve of the hydraulic steering gear of the present invention, it is only necessary to first locate the relative position of the rotary valve 100 and the rotating member 20 through the circumferential limit surface and the axial limit surface 211, and rotate the rotating member 20, so that the drill bit and one of the guide holes 22 of the rotating member 20 are coaxially opposite, the limiting part and the positioning part of the positioning mechanism 40 are connected, the rotating member 20 and the fixed member 10 are switched to a fixed connection state, and then the drill bit is inserted into the guide hole 22 and the rotary valve 100 is drilled along the guide hole 22 to form the first inclined oil hole 101, and then the rotary valve 100 is withdrawn. Take out the drill bit, insert the locating pin 30 into the guide hole 22 and the first inclined oil hole 101, at this time, the rotary valve 100 can rotate synchronously with the rotating part 20, and the axial relative position of the remaining guide hole 22 and the rotary valve 100 is the position of the remaining inclined oil hole 101 to be processed, and the processing accuracy of the inclined oil hole 101 is guaranteed. At the same time, when processing the remaining inclined oil holes 101, it is only necessary to rotate the rotating part 20 and the rotary valve 100 in turn, and rotate the remaining guide holes 22 in turn to the position coaxially relative to the drill bit, so as to process the remaining inclined oil holes 101. The operation is very convenient and quick, and the drilling efficiency is effectively improved.

[0028] In one embodiment, the rotating member 20 is provided with a receiving groove 21 for receiving the rotary valve 100, the inner circumferential wall of the receiving groove 21 forms the circumferential limiting surface, the inner end surface of the receiving groove 21 forms the axial limiting surface 211, and the guide hole 22 is connected with the receiving groove 21, so that the drill bit can drill the rotary valve 100 located in the receiving groove 21 along the guide hole 22 to form the inclined oil hole 101.

[0029] By placing the rotary valve 100 in the receiving groove 21 of the rotating member 20 , the rotary valve 100 and the rotating member 20 can be initially positioned and fixed, so that the drill bit can drill the rotary valve 100 in the receiving groove 21 along the guide hole 22 to form an inclined oil hole 101 .

[0030] In one embodiment, the rotating member 20 is provided with an inclined hole 23 which is circumferentially arranged around the rotation axis of the rotating member 20 and coaxially opposite to the inclined oil hole 101 to be processed in the rotary valve 100, and a drill sleeve 24 is fixed in the inclined hole 23, and the inner hole of the drill sleeve 24 forms the guide hole 22.

[0031] The drill sleeve 24 can play a good guiding and positioning role for the drill bit to improve the drilling accuracy of the inclined oil hole 101. The number of drill sleeves 24 is the same as the number of inclined oil holes 101 that need to be processed in the rotary valve 100, and they are coaxially opposite to each other to control the position accuracy and processing accuracy of each inclined oil hole 101.

[0032] In one embodiment, the rotating member 20 is inclined relative to the horizontal plane so that the guide hole 22 on the rotating member 20 can be in a vertical direction when it rotates to a position coaxial with the drill bit. The outer contour of the cross section of the rotating member 20 is a regular polygon with a number of sides corresponding to the number of inclined oil holes 101 of the rotary valve 100. The guide holes 22 are respectively located on the plane of the outer periphery of the regular polygonal rotating member 20. The fixed member 10 is provided with a bottom supporting surface and an end supporting surface 17 respectively abutting against the plane of the outer periphery of the regular polygonal rotating member 20 and the end face of the rotating member 20 to support the rotating member 20.

[0033] The bottom supporting surface and the end supporting surface 17 can support the rotating member 20 whose outer contour of the cross section is a regular polygon, so as to prevent the gravity of the rotating member 20 from acting on the connection between the rotating member 20 and the support 12 described later, causing unstable support and affecting the drilling accuracy.

[0034] In one embodiment, the specific rotational connection relationship between the rotating member 20 and the fixed member 10 is as follows: the fixed member 10 is fixedly provided with a support 12, and the end of the support 12 is provided with an annular boss 121, and the end of the rotating member 20 is fixedly provided with an end cover 25, and the end cover 25 and the rotating member 20 are combined to form a limiting ring groove, and the rotating member 20 is rotatably sleeved on the outside of the annular boss 121 through the limiting ring groove, and the rotating member 20 and the support 12 are provided with an avoidance groove 110 for avoiding the rotary valve 100, and the positioning pin 30 can be made of magnetic material, so that the positioning pin 30 can be adsorbed and fixed on the drill sleeve 24.

[0035] The specific structure of the positioning mechanism 40 is as follows: the fixing member 10 is fixed with a guide cylinder 11, the positioning portion includes a positioning hole 41 which is circumferentially arranged at the end of the rotating member 20 and corresponds one-to-one to the guide hole 22, the limiting portion includes a positioning rod 42 which is slidably arranged in the guide cylinder 11 and whose axis is located on a motion trajectory at the center of the positioning hole 41, and the positioning rod 42 can be plugged into the positioning hole 41 to switch the rotational connection and fixed connection state between the rotating member 20 and the fixing member 10. The positioning mechanism 40 also includes a first spring 43, the positioning rod 42 is provided with a limiting boss 421, the guide cylinder 11 is fixed to the support 12 through the bracket 111, the first spring 43 is sleeved on the positioning rod 42, and the two ends of the first spring 43 are respectively abutted against the limiting boss 421 and the bracket 111, so that the positioning rod 42 can be plugged into the positioning hole 41 under the elastic force of the first spring 43. The positioning rod 42 is also provided with a handle 422, so that the positioning rod 42 can be pulled axially by the handle 422 to pull the positioning rod 42 out of the positioning hole 41.

[0036] The positioning rod 42 is pulled axially by the handle 422 to be pulled out of the positioning hole 41. At this time, the rotating member 20 can rotate relative to the support 12 and is in a rotationally connected state; when the handle 422 is released, the positioning rod 42 can be re-inserted into the positioning hole 41. At this time, the rotating member 20 cannot rotate relative to the support 12 and is in a fixedly connected state.

[0037] In one of the embodiments, it further includes a bottom supporting member 50, a second spring 60 and a locking member 70, the bottom supporting surface is the upper end surface 51 of the bottom supporting member 50, the fixing member 10 is provided with a guide groove 13, the bottom supporting member 50 is slidably arranged in the guide groove 13, the bottom supporting member 50 is provided with a step surface 53, and a blocking surface 14 abutting against the step surface 53 is provided in the guide groove 13 of the fixing member 10 to limit the upward movement of the bottom supporting member 50. The second spring 60 is connected to the bottom support member 50 and the fixing member 10 respectively to provide elastic force for the bottom support member 50 to move upward, so that the bottom support member 50 can rebound upward and is arranged on the fixing member 10. The locking member 70 is arranged on the fixing member 10. The bottom support member 50 is provided with a locking groove 52. The locking member 70 is provided with a locking portion that can move laterally relative to the bottom support member 50 and can be plugged into the locking groove 52 to switch the sliding connection and fixed connection state between the bottom support member 50 and the fixing member 10. The bottom support member 50 is provided with a groove 55 for avoiding the positioning pin 30.

[0038] The specific connection relationship between the second spring 60 and the bottom support member 50 and the fixing member 10 is as follows: a limiting hole 15 which is connected to the guide groove 13 is also provided inside the fixing member 10, a guide column 54 is provided at the bottom of the bottom support member 50, the bottom of the bottom support member 50 is slidably inserted into the limiting hole 15 through the guide column 54, the second spring 60 is sleeved on the guide column 54, and the two ends of the second spring 60 are respectively abutted against the bottom surface of the bottom support member 50 and the inner end surface of the guide groove 13.

[0039] The specific structure of the locking member 70 is as follows: the locking member 70 includes a first bolt 71, the locking portion is a locking pin 72 arranged at the end of the first bolt 71, the fixing member 10 is provided with a first screw hole 16 which is in communication with the guide groove 13, the first bolt 71 is screwed with the first screw hole 16, and when the first bolt 71 is rotated, the locking pin 72 can be driven to move laterally relative to the base member 50 and can be plugged into the locking groove 52.

[0040] Since the outer contour of the cross-section of the rotating member 20 is a regular polygon, and the bottom support member 50 is supported by the bottom supporting surface against the plane of the outer periphery of the regular polygonal rotating member 20, when the rotating member 20 is rotated, the rotating member 20 cannot rotate due to the limitation of the bottom supporting surface. At this time, it is necessary to tighten the first bolt 71 to allow the locking pin 72 to withdraw from the locking groove 52 before the rotating member 20 can be rotated.

[0041] In one of the embodiments, it also includes an end limit piece 80 and a locking piece 90. The end limit piece 80 is detachably slidably arranged on the fixing piece 10 and can move axially relative to the rotary valve 100 placed in the accommodating groove 21. The locking piece 90 is detachably connected to the end limit piece 80 and the fixing piece 10 to switch the sliding connection and fixed connection state between the end limit piece 80 and the fixing piece 10. The end limit piece 80 is provided with an abutting surface 81 that can abut against the end surface of the rotary valve 100, so that when the drill bit performs drilling processing on the rotary valve 100, the end limit piece 80 is fixedly abutted against the end surface of the rotary valve 100 placed in the accommodating groove 21 through the abutting surface 81 to limit the axial relative movement of the rotary valve 100 and the rotating member 20.

[0042] The specific structure of the locking member 90 is as follows: the locking member 90 includes a second bolt 91, the fixing member 10 is provided with a slide groove 18, the end limit member 80 is provided with a slide rail 82, the end limit member 80 is slidably inserted in the slide groove 18 through the slide rail 82, the fixing member 10 is provided with a second screw hole 19, the end limit member 80 is provided with a second through hole 83 coaxially opposite to the second screw hole 19, the second bolt 91 is penetrated through the second through hole 83, and is screwed with the second screw hole 19.

[0043] When the rotating member 20 and the fixed member 10 are in a fixed connection state, and the drill bit is coaxially opposite to the guide hole 22 and the rotary valve 100 is drilled along the guide hole 22 to form an oblique oil hole 101, it is necessary to tighten the second bolt 91 at this time, and the abutment surface 81 of the end limit member 80 is fixedly abutted against the end surface of the rotary valve 100 placed in the accommodating groove 21 to limit the axial relative movement of the rotary valve 100 and the rotating member 20, so as to improve the degree of tight connection between the rotary valve 100 and the rotating member 20, thereby improving the drilling accuracy of the oblique oil hole 101.

[0044] like Figure 4 As shown, a method for machining an inclined oil hole of a hydraulic steering gear rotary valve adopts the machining fixture of the inclined oil hole of a hydraulic steering gear rotary valve, and comprises the following steps:

[0045] Step 1. Position the relative positions of the rotary valve 100 and the rotating member 20 through the circumferential limiting surface and the axial limiting surface 211, rotate the rotating member 20, make the drill bit and one of the guide holes 22 of the rotating member 20 coaxially opposite, connect the limiting part of the positioning mechanism 40 with the positioning part, and switch the rotating member 20 and the fixing member 10 to a fixed connection state;

[0046] More specifically, first remove the second bolt 91, remove the end stopper 80 from the fixed member 10, then place the rotary valve 100 in the receiving groove 21 of the rotating member 20, rotate the rotating member 20 until the drill bit is coaxially opposite to one of the guide holes 22 of the rotating member 20, insert the positioning rod 42 into the positioning hole 41, and fix the rotating member 20 to the fixed member 10, then tighten the second bolt 91, and fix the end stopper 80 to the end face of the rotary valve 100 placed in the receiving groove 21 through the abutment surface 81, so that the rotary valve 100 and the rotating member 20 are pressed and fixed;

[0047] Step 2: insert the drill bit into the guide hole 22 and drill the rotary valve 100 along the guide hole 22 to form a first oblique oil hole 101;

[0048] Step 3. withdraw the drill bit, insert the positioning pin 30 into the guide hole 22 and the first oblique oil hole 101 to limit the relative rotation between the rotary valve 100 and the rotating member 20. At this time, the rotary valve 100 can rotate synchronously with the rotating member 20 by rotating the rotating member 20;

[0049] Step 4. Separate the limiting part of the positioning mechanism 40 from the positioning part, rotate the rotating member 20 and the rotary valve 100, rotate the remaining guide holes 22 in sequence to positions coaxially opposite to the drill bit, and after switching the rotating member 20 and the fixing member 10 to a fixed connection state through the positioning mechanism 40, drill the remaining oblique oil holes 101;

[0050] More specifically, after the locating pin 30 is inserted into the guide hole 22 and the first oblique oil hole 101, the axially relative position of the remaining guide hole 22 and the rotary valve 100 is the position of the remaining oblique oil hole 101 that needs to be processed. When processing the remaining oblique oil hole 101, it is only necessary to rotate the rotating member 20 and the rotary valve 100 in sequence, and rotate the remaining guide hole 22 in sequence to a position coaxially relative to the drill bit, and then the remaining oblique oil hole 101 can be drilled. Before each rotation of the rotating member 20, it is necessary to first disengage the locating rod 42 from the locating hole 41, and separate the abutting surface 81 of the end limit member 80 from the end surface of the rotary valve 100, and then withdraw the locking pin 72 from the locking groove 52. After the rotating member 20 and the rotary valve 100 are rotated into place, the locating rod 42, the abutting surface 81 and the locking pin 72 are reset, and the rotary valve 100 is multiple-fixed to improve the drilling accuracy of the oblique oil hole 101.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A processing fixture for the inclined oil hole of a hydraulic steering valve, characterized in that: The invention comprises a fixed part, a rotating part, a positioning pin and a positioning mechanism, wherein the rotating part is provided with a circumferential limiting surface and an axial limiting surface which can abut against the rotary valve to position the relative position of the rotary valve and the rotating part, the rotating part is rotatably arranged on the fixed part, the rotating part is provided with guide holes which are circumferentially arranged around the rotating axis of the rotating part and are coaxially opposite to the oblique oil holes to be processed in the rotary valve, the positioning mechanism comprises a limiting part provided on the fixed part and a positioning part provided on the rotating part and detachably connected to the limiting part, and is used for switching the rotating connection and fixed connection state between the rotating part and the fixed part, so that the rotating part can rotate around the axis of the rotating part in the rotating connection state The guide hole corresponding to the drill bit is switched by the threaded connection, and the drill bit can be coaxially opposite to the guide hole and drill the rotary valve along the guide hole in a fixed connection state to form an oblique oil hole. The positioning pin can be detachably inserted into the guide hole and the first oblique oil hole after the first oblique oil hole is drilled, so as to limit the relative rotation of the rotary valve and the rotating part, and to locate the relative position of the guide hole and the remaining oblique oil holes to be processed in the rotary valve when the remaining oblique oil holes are processed. The fixing part is fixed with a guide cylinder, and the positioning part includes a positioning hole arranged at the end of the rotating part along the circumferential direction and corresponding to the guide hole one by one. The limiting part includes a positioning hole slidably penetrated through the guide hole The guide holes are located on the planes of the outer periphery of the regular polygonal rotating member, and the fixing member is provided with bottom bearings which abut against the planes of the outer periphery of the regular polygonal rotating member and the end faces of the rotating member. The support surface and the end supporting surface are used to support the rotating part, and also include a bottom supporting part, a second spring and a locking part. The bottom supporting surface is the upper end surface of the bottom supporting part, the fixing part is provided with a guide groove, and the bottom supporting part is slidably arranged in the guide groove. The second spring is respectively connected to the bottom supporting part and the fixing part to provide elastic force for the bottom supporting part to move upward so that the bottom supporting part can rebound upward and be arranged on the fixing part. The locking part is arranged on the fixing part, and the bottom supporting part is provided with a locking groove. The locking part is provided with a locking part that can move laterally relative to the bottom supporting part and can be plugged in and out of the locking groove to switch the sliding connection and fixed connection state between the bottom supporting part and the fixing part.

2. A processing fixture for the inclined oil hole of a hydraulic steering valve according to claim 1, characterized in that: The rotating part is provided with a receiving groove for receiving the rotary valve, the inner circumferential wall of the receiving groove forms the circumferential limiting surface, the inner end surface of the receiving groove forms the axial limiting surface, and the guide hole is connected with the receiving groove, so that the drill bit can drill the rotary valve located in the receiving groove along the guide hole to form an inclined oil hole.

3. A processing fixture for the inclined oil hole of a hydraulic steering valve according to claim 1, characterized in that: The rotating member is provided with an inclined hole which is circumferentially arranged around the rotating axis of the rotating member and coaxially opposite to the inclined oil hole to be processed in the rotary valve. A drill sleeve is fixed in the inclined hole, and the inner hole of the drill sleeve forms the guide hole.

4. A processing fixture for the inclined oil hole of a hydraulic steering valve according to claim 1, characterized in that: The locking component includes a first bolt, the locking portion is a locking pin arranged at the end of the first bolt, the fixing component is provided with a first screw hole which is connected with the guide groove, the first bolt is screwed with the first screw hole, and when the first bolt is rotated, the locking pin can be driven to move laterally relative to the base support and can be plugged into the locking groove.

5. A processing fixture for the inclined oil hole of a hydraulic steering valve according to claim 2, characterized in that: It also includes an end limit piece and a locking piece. The end limit piece is detachably slidably arranged on the fixing piece and can move axially relative to the rotary valve placed in the accommodating groove. The locking piece is detachably connected to the end limit piece and the fixing piece to switch the sliding connection and fixed connection state between the end limit piece and the fixing piece. The end limit piece is provided with an abutment surface that can abut against the end face of the rotary valve, so that when the drill bit drills the rotary valve, the end limit piece is fixedly abutted against the end face of the rotary valve placed in the accommodating groove through the abutment surface to limit the axial relative movement of the rotary valve and the rotating part.

6. A processing fixture for the inclined oil hole of a hydraulic steering valve according to claim 5, characterized in that: The locking piece includes a second bolt, the fixing piece is provided with a slide groove, the end limit piece is provided with a slide rail, the end limit piece is slidably inserted in the slide groove through the slide rail, the fixing piece is provided with a second screw hole, the end limit piece is provided with a second through hole coaxially opposite to the second screw hole, the second bolt is passed through the second through hole and is threadedly connected to the second screw hole.

7. A method for processing the inclined oil hole of a hydraulic steering valve, characterized in that: A processing fixture for the inclined oil hole of a hydraulic steering valve as claimed in any one of claims 1 to 6 is used, and includes the following steps: Step 1. Position the relative positions of the rotary valve and the rotating member through the circumferential limiting surface and the axial limiting surface, rotate the rotating member so that the drill bit and one of the guide holes of the rotating member are coaxially opposite to each other, connect the limiting part of the positioning mechanism with the positioning part, and switch the rotating member and the fixed member to a fixed connection state; Step 2: Insert the drill bit into the guide hole and drill the rotary valve along the guide hole to form the first inclined oil hole; Step 3. Remove the drill bit and insert the positioning pin into the guide hole and the first oblique oil hole to limit the relative rotation between the rotary valve and the rotating part; Step 4. Separate the limiting part from the positioning part of the positioning mechanism, rotate the rotating part and the rotary valve, rotate the remaining guide holes in turn to a position coaxially opposite to the drill bit, and after switching the rotating part and the fixing part to a fixed connection state through the positioning mechanism, drill the remaining inclined oil holes.

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