Positioning fixture for NC drilling and milling of cycloid disk

Abstract

The present invention provides a positioning fixture for CNC drilling and milling of a cycloidal disk, comprising: a clamping body, which can be used to support the cycloidal disk and has a positioning channel running through from top to bottom, the positioning channel corresponding to at least three positioning holes on the cycloidal disk; at least three positioning components corresponding to the at least three positioning holes, each positioning component comprising a locking pin and an expansion sleeve sleeved on the locking pin, the locking pin having a tapered portion accommodated in the positioning hole, a rod portion connected to the lower portion of the tapered portion and accommodated in the positioning channel, at least part of the expansion sleeve being located in the tapered portion, the expansion sleeve having a locking state in which the corresponding positioning hole is radially expanded to be locked, and an unlocking state in which the positioning hole is unlocked by being reset; and a driving component, which is used to drive the locking pin to move up and down so that the expansion sleeve switches between a locked state and an unlocked state; the circumferential and radial positioning of the cycloidal disk can be realized, which is beneficial to the one-time processing of the tooth shape, the center hole, and the peripheral holes and can ensure good coaxiality of the three.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled milling machine equipment, and in particular to a positioning fixture for numerically controlled drilling and milling of a cycloid disk. Background Art

[0002] Nowadays, high-precision reducers are commonly used in the robot and logistics industries as transmission devices. For example, the RV reducer and harmonic gear reducer that we are familiar with. Among them, the cycloid disk is the secondary reduction device of the RV reducer and is one of the core parts of the whole device. Due to the special shape of the cycloid disk, the processing method and positioning and clamping method of the cycloid disk parts are diverse.

[0003] In the prior art, when the cycloidal disk is subjected to CNC drilling and milling, it is difficult to position the cycloidal disk during processing, so the tooth shape, center hole, peripheral holes, etc. of the cycloidal disk need to be processed and formed in batches, resulting in low processing efficiency, long working hours, and extremely cumbersome procedures; in addition, there is also the problem of poor coaxiality among the tooth shape of the cycloidal disk, the center hole, and the pitch circle where the peripheral holes are located after processing, which seriously affects the accuracy and performance of the reducer.

[0004] In view of this, it is necessary to provide a new positioning fixture for CNC drilling and milling of cycloid disks to solve the above problems. Summary of the invention

[0005] In order to solve at least one of the aforementioned technical problems, an object of the present invention is to provide a positioning fixture for CNC drilling and milling of cycloid disks.

[0006] In order to achieve the above-mentioned invention object, the present invention provides a positioning fixture for CNC drilling and milling of a cycloid disk, comprising:

[0007] A clamping body, the upper surface of which can be used to support the cycloid disk, and has a positioning channel that passes through the clamping body from top to bottom, and the positioning channel corresponds to at least three positioning holes on the cycloid disk;

[0008] At least three positioning components corresponding to at least three positioning holes one by one, each positioning component comprising a locking pin and an expansion sleeve sleeved on the locking pin, the locking pin having a tapered portion accommodated in the positioning hole, a rod portion connected to the lower portion of the tapered portion and accommodated in the positioning channel, at least part of the expansion sleeve being located in the tapered portion, the expansion sleeve having a locking state of radially expanding to lock the corresponding positioning hole and an unlocking state of resetting to unlock the positioning hole; and

[0009] A driving assembly is used to drive the locking pin, and in the process of driving the locking pin to move up and down, the expansion sleeve switches between the locking state and the unlocking state.

[0010] As a further improved technical solution of the present invention, the cone portion has an outer surface that is inwardly contracted from top to bottom toward the center line of the locking pin, the expansion sleeve has a limited surface, and the clamp body has a limited surface;

[0011] When the driving assembly drives the locking pin to move downward, the limiting surface abuts against the limited surface to stop the expansion sleeve from moving downward, and the expansion sleeve switches from the unlocked state to the locked state.

[0012] As a further improved technical solution of the present invention, the upper portion of the positioning channel has a step portion constituting the limiting surface, and the lower end of the expansion sleeve is accommodated in the positioning channel and abuts against the step portion.

[0013] As a further improved technical solution of the present invention, the drive assembly comprises:

[0014] A transmission member, wherein the plurality of locking pins are all connected to the transmission member;

[0015] A driving member, which drives the transmission member to drive the locking pin to move from bottom to top when starting the operation; and

[0016] The elastic member undergoes elastic deformation when the driving member drives the transmission member to move from bottom to top, and when the driving member stops, the elastic member acts on the transmission member to drive the locking pin to move from top to bottom.

[0017] As a further improved technical solution of the present invention, the driving member includes:

[0018] a cylinder having an inner cavity and relatively fixedly disposed below the clamp body; and,

[0019] A piston disposed in the inner cavity and reciprocating up and down between the cylinder body and the clamp body;

[0020] Wherein, the transmission member is arranged between the piston and the clamp body, and when the driving member starts to operate, the piston drives the transmission member to move upward.

[0021] As a further improved technical solution of the present invention, a hole structure concave upward is formed on the lower surface of the clamp body, and the piston has a column structure matching the shape of the hole structure, and the column structure movably extends up and down into the hole structure.

[0022] As a further improved technical solution of the present invention, the hole structure passes through the clamp body from top to bottom and is coaxial with the cycloid disk;

[0023] The positioning fixture further comprises a loading and unloading auxiliary part, the lower end of which is connected to the column structure; the upper end of the loading and unloading auxiliary part has an operable part, and the operable part is exposed on the upper surface of the clamp body.

[0024] As a further improved technical solution of the present invention, the transmission member has a transmission rod connected to the locking pin and a boss located at the lower end of the transmission rod, the transmission member is movably located below the clamp body and the boss is spaced apart from the clamp body;

[0025] The elastic member is located between the clamp body and the boss;

[0026] When the driving member drives the transmission member to move upward, the boss and the clamp body move relative to each other to cause the elastic member to undergo elastic deformation;

[0027] When the driving member stops, the elastic member provides a driving force that enables the transmission member to drive the locking pin to move downward.

[0028] As a further improved technical solution of the present invention, the transmission member is connected to at least three of the locking pins in a one-to-one correspondence;

[0029] The elastic member is a compression spring sleeved on the transmission rod.

[0030] As a further improved technical solution of the present invention, one of the clamp body and the transmission member is provided with a guide pin protruding laterally, and the other is provided with a guide groove extending in the up-down direction and cooperating with the guide pin.

[0031] As a further improved technical solution of the present invention, the positioning channel corresponds one-to-one to at least three of the positioning components.

[0032] The beneficial effect of the invention is that by providing the positioning components corresponding to at least three positioning holes of the cycloid disk, and driving the positioning components through the driving component, when the expansion sleeve is in the unlocked state, the cycloid disk can be placed and disassembled, and when the expansion sleeve is in the locked state, the cycloid disk is synchronously positioned in the circumferential direction and the radial direction, thereby realizing the positioning and clamping of the cycloid disk, thereby realizing the one-time processing of the tooth shape, center hole and peripheral holes of the cycloid disk, and ensuring that the tooth shape, center hole and the pitch circle of the peripheral holes of the cycloid disk have good coaxiality after processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a stereoscopic diagram of the matching state of the positioning fixture and the cycloid disk of a preferred embodiment;

[0034] Figure 2is a structural diagram of a fourth-axis turntable of a preferred embodiment;

[0035] Figure 3 This is a structural diagram of a driving member, a transmission member, an elastic member and a guide pin of a preferred embodiment;

[0036] Figure 4 This is a structural diagram of a clamp body of a preferred embodiment;

[0037] Figure 5 This is a structural diagram of a locking pin, an expansion sleeve, and a loading and unloading auxiliary part of a preferred embodiment;

[0038] Figure 6 It is a structural diagram of a cycloid disk applicable to a positioning fixture of a preferred embodiment;

[0039] Figure 7 It is a cross-sectional view of the matching state of the positioning fixture and the cycloid disk of a preferred embodiment;

[0040] Figure 8 yes Figure 7 A magnified view of a local area. DETAILED DESCRIPTION

[0041] See also Figures 1 to 8 As shown, a positioning fixture of a preferred embodiment of the present invention is illustrated, and the specific application of the positioning fixture when applied to the CNC drilling and milling of a cycloidal disk is illustrated, including the fixing of the positioning fixture on a CNC machine tool and the cycloidal disk 1 to which the positioning fixture is applicable. In conjunction with these illustrations, the positioning fixture of a preferred embodiment of the present invention is introduced below.

[0042] The positioning fixture comprises a clamp body 3, at least three positioning components and a driving component.

[0043] Among them, the clamp body 3 is fixedly assembled on the fourth-axis turntable 2 of the CNC machine tool, and its upper surface 31 can be used to support the cycloid disk 1, and has a positioning channel 32 that passes through the clamp body 3 from top to bottom. The positioning channel 32 corresponds to at least three positioning holes 1a on the cycloid disk 1, thereby at least playing an avoidance role for the locking pin 6 described later, so that the locking pin 6 passes through the clamp body 3 to cooperate with the cycloid disk 1 and the driving assembly respectively.

[0044] Regarding the configuration of the positioning channel 32, in the preferred embodiment, it is set as a cylindrical channel extending substantially up and down, and is in a matching form with the locking pin 6 described later in the surface, so as to play a role of avoiding and positioning the locking pin 6 at the same time; in addition, regarding the number of the positioning channels 32, in the preferred embodiment, corresponding to the four positioning holes 1a uniformly distributed at 90° intervals in the circumferential direction on the cycloid disk 1, the number of the positioning channels 32 is also set to four uniformly distributed at 90° intervals in the circumferential direction, so as to correspond one to one with the four positioning holes 1a. Of course, in the variant embodiment, the positioning channels 32 can also be set to other configurations and numbers, so as to meet the basic design principle of connecting at least three positioning holes 1a with the bottom of the clamp body 3 (that is, the positioning channel 32 that connects a positioning hole 1a with the bottom of the clamp body 3 is the positioning channel 32 corresponding to the positioning hole 1a), and the corresponding relationship between the positioning channels 32 and the at least three positioning holes 1a can be one-to-one, one-to-many, etc.

[0045] At least three of the positioning components correspond one-to-one with at least three of the positioning holes 1a, that is, the number of the positioning components is set to at least three, and each of the positioning components corresponds to one of the positioning holes 1a. For the four positioning holes 1a in this preferred embodiment, the number of the positioning components is set to 4. Of course, in the variant embodiment, the number of the positioning components only needs to be three or more. In addition, in this preferred embodiment, the positioning components are also in a one-to-one correspondence with the positioning channel 32, but when the configuration or number of the positioning channel 32 changes as described above, at least three of the positioning components can still correspond to the positioning channel 32 in a two-to-one, many-to-one, etc. manner, with the positioning channel 21 being able to avoid at least three of the positioning components as the basic principle.

[0046] Each of the positioning components includes a locking pin 6 and an expansion sleeve 7 .

[0047] The locking pin 6 is arranged in the positioning channel 32, and passes through the clamp body 3 from top to bottom. Specifically, the locking pin 6 has a cone 601 and a rod 602, wherein the cone 601 constitutes the upper end of the locking pin 6, and when the cycloid disk 1 is placed on the clamp body 3, the cone 601 is accommodated in the positioning hole 1a; the rod 602 is connected to the lower part of the cone 601 and accommodated in the positioning channel 32, and the lower end of the rod 602 passes through the clamp body 3 and extends to the bottom of the clamp body 3 so as to cooperate with the driving assembly (see below for details), wherein, as described above, the positioning channel 32 plays a role of avoiding the rod 602, and preferably, as in this embodiment, at least part of the surface of the positioning channel 32 and at least part of the outer surface of the rod 602 are substantially cylindrical and fit together, so as to play a role of guiding and positioning the rod 602.

[0048] The expansion sleeve 7 is sleeved on the locking pin 6, and at least part of the expansion sleeve 7 is located in the cone 601. Combined with the foregoing, it can be seen that when the cycloid disk 1 is placed on the clamp body 3, the part of the expansion sleeve 7 located in the cone 601 is also accommodated in the positioning hole 1a.

[0049] The expansion sleeve 7 has a locked state and Figure 8 The unlocked state shown. Wherein, when the expansion sleeve 7 is in the locked state, the expansion sleeve 7 expands radially, and its outer surface closely fits the hole wall of the corresponding positioning hole 1a to lock the corresponding positioning hole 1a; when the expansion sleeve 7 is in the unlocked state, the expansion sleeve 7 is radially retracted and reset from the aforementioned radial expansion state, and its outer surface leaves or just contacts the hole wall of the corresponding positioning hole 1a to unlock the positioning hole 1a. It can be understood that when the expansion sleeve 7 and the positioning hole 1a are matched in the locked state, the cycloid disk 1 is restricted by the expansion sleeve 7 and cannot shake, and combined with at least three of the positioning holes 1a are locked, the cycloid disk 1 cannot rotate around its central axis; and when the expansion sleeve 7 unlocks the positioning hole 1a, the cycloid disk 1 is free from the restriction and can be loaded and unloaded.

[0050] The driving assembly is used to drive the locking pin 6 to reciprocate up and down. As mentioned above, the lower end of the rod portion 602 of the locking pin 6 extends to the bottom of the clamp body 3, thereby achieving contact and cooperation with the driving assembly. Furthermore, the driving assembly can achieve the purpose of driving the locking pin 6.

[0051] In the process that the driving assembly drives the locking pin 6 to move up and down, the expansion sleeve 7 switches between the locking state and the unlocking state, that is, the locking and unlocking of the cycloid disk 1 are correspondingly realized.

[0052] Based on the above description, it can be known that the positioning fixture of the present invention, by providing the positioning components corresponding to the at least three positioning holes 1a of the cycloid disk 1 respectively, and by driving the positioning components through the driving component, when the expansion sleeve 7 is in the unlocked state, the cycloid disk 1 can be placed and disassembled; of course, it can be understood that when the cycloid disk 1 needs to be placed, after the cycloid disk 1 is placed on the clamp body 3, the positioning component can be passed through the corresponding positioning hole 1a and the positioning channel 32, and connected to the driving component. At this time, after the positioning component is connected to the driving component, the expansion sleeve is in the unlocked state.

[0053] When the expansion sleeve 7 is in the locked state, the cycloid disk 1 is synchronously positioned in the circumferential direction and the radial direction, thereby realizing the positioning and clamping of the cycloid disk 1, thereby realizing the one-time processing and manufacturing of the tooth shape, the center hole and the peripheral holes of the cycloid disk 1, and ensuring that the tooth shape, the center hole and the pitch circle of the peripheral holes of the cycloid disk 1 have good coaxiality after processing.

[0054] Furthermore, the driving assembly can drive the locking pin 6 to reciprocate up and down.

[0055] In a specific embodiment, the cone portion has an outer surface 61 that is inwardly contracted from top to bottom toward the center line of the locking pin, and the outer surface 61 may be an inclined plane or a curved surface, and the cone portion 601 is preferably in the form of an inverted cone that is thick at the top and thin at the bottom. When the drive assembly drives the locking pin 6 to move from bottom to top, the expansion sleeve 7 switches from the unlocked state to the locked state; when the drive assembly drives the locking pin 6 to move from bottom to top, the expansion sleeve 7 switches from the locked state to the unlocked state.

[0056] Specifically, in a preferred embodiment of the present invention, the expansion sleeve 7 has a limited surface 71, and the clamp body 3 has a limited surface 321. In the process of the locking pin 6 moving from top to bottom, the limited surface 321 abuts against the limited surface 71 to stop the downward movement of the expansion sleeve 7. Therefore, in the process of the driving component driving the locking pin 6 to move from top to bottom, the expansion sleeve 7 is abutted by the limited surface 321 and stops moving. When the locking pin 6 moves downward relative to the expansion sleeve 7, the outer surface 61 of the cone 601 presses the expansion sleeve 7 radially outward, so that the expansion sleeve 7 radially expands to the locked state; conversely, in the process of the driving component driving the locking pin 6 to move from bottom to top, the locking pin 6 moves upward relative to the expansion sleeve 7 so that its outer surface 61 gradually separates from the expansion sleeve 7, and the expansion sleeve 7 is radially retracted and reset to the unlocked state.

[0057] Preferably, in this embodiment, the upper portion of the positioning channel 32 has a step portion constituting the limiting surface 321, and the step portion is constructed based on the increase in the upper diameter of the positioning channel 32. The lower end of the expansion sleeve 7 is accommodated in the positioning channel 32 and abuts against the step portion, that is, the lower end surface of the expansion sleeve 7 constitutes the limited surface 71. In this way, on the one hand, the movement of the expansion sleeve 7 can be stopped, and on the other hand, by accommodating the lower end of the expansion sleeve 7 in the positioning channel 32, the installation and positioning of the expansion sleeve 7 can be achieved to prevent the expansion sleeve 7 from shaking.

[0058] Furthermore, the driving assembly includes a driving member 4 and an elastic member 10 .

[0059] In a preferred embodiment, the driving member 4 drives the locking pin 6 to move from bottom to top when starting the operation, that is, its driving force serves as the source power for realizing that the expansion sleeve 7 changes from the locked state to the unlocked state, and in this process, the elastic member 10 undergoes elastic deformation; when the driving member 4 stops, the elastic member 10 drives the locking pin 6 to move from top to bottom in the process of at least partially restoring the deformation, that is, its deformation recovery force serves as the source power for realizing that the expansion sleeve 7 changes from the unlocked state to the locked state. Of course, in a variant embodiment, the driving direction of the locking pin 6 by the driving member 4 and the elastic member 10 can also be reversed.

[0060] Here, the specific implementation of the driving member 4 is introduced. The driving member 4 can be configured as any one of a hydraulic cylinder, a gas cylinder, a motor, etc.

[0061] Preferably, the driving member 4 is configured as any one of a hydraulic cylinder and a pneumatic cylinder, which includes a cylinder body 41 having an inner cavity 412 and a piston 42 reciprocatingly disposed in the inner cavity 412 .

[0062] Further preferably, the cylinder body 41 is fixedly assembled on the fourth-axis turntable 2 of the CNC machine tool, which is located below the piston 42 and is provided with a driving medium inlet and outlet 411, and the driving medium inlet and outlet 411 is located at the lower center position of the cylinder body 41. In this embodiment, the driving medium inlet and outlet 411 is specifically formed in the gas joint assembled on the main body of the cylinder body 41.

[0063] It can be understood that the driving medium inlet and outlet 411 can be used to introduce the driving medium into the inner cavity 412 of the cylinder body 41, and can also be used to discharge the driving medium in the inner cavity 412. When the driving member 4 is configured as a hydraulic cylinder, the driving medium is hydraulic oil; when the driving member 4 is configured as a gas cylinder, the driving medium is gas.

[0064] Among them, when the driving medium enters the inner cavity 412 through the driving medium inlet and outlet 411, the piston 42 moves from bottom to top due to the increase in air pressure in the inner cavity 412, and at this time, the locking pin 6 can be driven to move from bottom to top; when the driving medium flows out of the inner cavity 412 through the driving medium inlet and outlet 411, the air pressure in the inner cavity 412 decreases, and the piston 42 is allowed to return from top to bottom under an external force (such as the force of the elastic member 10). It can be seen from this that by arranging the piston 42 above the cylinder body 41 and introducing the driving medium below the piston 42, the movement of the piston 42 can be achieved, and then the driving of the locking pin 6 can be achieved, and good driving can be achieved with a simple structure, which has industrial practical value.

[0065] Further preferably, the piston 42 is sealed with the inner wall of the cylinder 41 to ensure the sealing of the inner cavity 412 of the cylinder 41. As shown in the figure, the outer surface of the piston 42 has a circular groove that is concave radially inward, and an O-type sealing ring 11 is arranged in the circular groove. The O-type sealing ring 11 is tightly clamped between the piston 42 and the inner wall of the cylinder 41.

[0066] Of course, the preferred embodiment presents an implementation method in which the driving member 4 drives the locking pin 6 to move from bottom to top. In a variant embodiment, by simply adjusting the driving member 4, for example, forming a closed space above the piston 42 and introducing a driving medium into the space, the driving member 4 can also drive the locking pin 6 to move from top to bottom. Of course, there are other variations, which are not listed here.

[0067] Furthermore, the driving assembly also includes a transmission member 5 , and all locking pins 6 are connected to the transmission member 5 . The elastic member 10 and the driving member 4 drive the locking pins 6 to reciprocate up and down through the transmission member 5 .

[0068] Specifically, in this preferred embodiment, the transmission member 5 is arranged below the clamp body 3 and supported on the piston 42, and its upper end is fixedly connected to the lower end of the rod 602 of the locking pin 6 by any of the methods of thread, buckle, and interference fit, and the two ends of the elastic member 10 act on the transmission member 5 and the clamp body 3 respectively; when the driving member 4 starts the operation, the piston 42 moves from bottom to top and drives the locking pin 6 from bottom to top through the transmission member 5, during which the transmission member 5 and the clamp body 3 move relatively close to each other to cause the elastic member 10 to undergo compressive elastic deformation; when the driving member 4 stops, the elastic member 10 recovers its deformation and drives the locking pin 6 from top to bottom through the transmission member 5. Therefore, the locking pin 6 moves autonomously from top to bottom through the action of the elastic member 10, thereby ensuring that the expansion sleeve 7 is always in the locking state during the processing of the cycloidal disk 1. Of course, in a modified embodiment, it can also be modified so that when the piston 42 moves from bottom to top, the elastic member 10 undergoes a tensile elastic deformation or a torsional elastic deformation.

[0069] Furthermore, corresponding to the multiple locking pins 6, the number of the transmission member 5 is set to multiple and corresponds one to one with the number of the locking pins 6, the transmission member 5 has a transmission rod 51 and a boss 52 located at the lower end of the transmission rod 51, the upper end of the transmission rod 51 is connected to a corresponding one of the locking pins 6, the lower end of the boss 52 is supported on the piston 42, and the boss 52 is spaced a certain distance from the clamp body 3. In the specific implementation, in order to ensure accuracy, the distance needs to be precisely positioned; and the elastic member 10 is located between the clamp body 3 and the boss 52.

[0070] In a specific embodiment, the elastic member 10 is a compression spring sleeved on the transmission rod 51 , and the lower end of the elastic member 10 is abutted against the upper surface of the boss 52 .

[0071] In addition, corresponding to the plurality of transmission members 5 , the number of the elastic members 10 is set to be plural and corresponds one to one with the number of the transmission members 5 , and each of the transmission rods 51 is sleeved with a corresponding elastic member 10 .

[0072] Of course, the number of the transmission members 5 and the number of the elastic members 10 are not limited to the present embodiment. For example, in a variant embodiment, the number of the transmission members 5 can also be set to one and correspond to multiple locking pins 6 in a one-to-many manner (e.g., the multiple bosses 52 in the preferred embodiment are integrally arranged to form one transmission member 5 in the variant embodiment, and the transmission member 5 can be equipped with multiple locking pins 6 at the same time); correspondingly, in a variant embodiment, the number of the elastic members 10 can also be set to one and correspond to multiple transmission members in a one-to-many manner (e.g., the multiple bosses 52 in the preferred embodiment are integrally arranged to form one transmission member 5 in the variant embodiment, and the transmission member 5 can be equipped with multiple locking pins 6 at the same time). A plurality of elastic members 10 are integrally arranged to form an elastic member 10 of the variant embodiment, and the elastic member 10 can drive a plurality of the transmission members 5 at the same time), or they can be arranged as one and correspond to a transmission member in a one-to-one manner (such as the plurality of bosses 52 in the preferred embodiment are integrally arranged to form a transmission member 5 of the variant embodiment, and at the same time, the plurality of elastic members 10 in the preferred embodiment are integrally arranged to form an elastic member 10 of the variant embodiment, so that the elastic member 10 drives the transmission member 5 to drive a plurality of the locking pins 6 at the same time), and other variations are not enumerated.

[0073] Furthermore, one of the clamp body 3 and the transmission member 5 is provided with a laterally protruding guide pin 8, and the other is provided with a guide groove 51 extending up and down and cooperating with the guide pin 8. When the transmission member 5 moves up and down, the guide pin 8 moves up and down in the guide groove 51 and restricts the transmission member 5 from rotating around the axis extending up and down, that is, avoiding the transmission member 5 from rotating horizontally, thereby achieving the limitation of the movement direction of the transmission member 5.

[0074] Please refer to Figure 8In the specific embodiment shown, the guide pin 8 is arranged on the clamp body 3. Specifically, the lower part of the clamp body 3 has a mounting hole 34, one end of the guide pin 8 is inserted into the mounting hole 34 with interference fit, and the other end of the guide pin 8 protrudes laterally through the mounting hole 34. Correspondingly, the guide groove 51 is arranged on the surface of the transmission member 5, and the guide pin 8 is inserted into the guide groove 51. In this way, when the transmission member 5 moves up and down, the guide pin 8 moves up and down in the guide groove 51 and limits the rotation of the transmission member 5 around the axis extending up and down, that is, to prevent the transmission member 5 from rotating horizontally, thereby realizing the limitation of the movement direction of the transmission member 5. Of course, it is not limited to this. For example, in a variant embodiment, the guide groove 51 and the guide pin 8 can be interchanged, that is, the guide groove is arranged on the clamp body 3, and the guide pin is arranged on the transmission member 5.

[0075] The lower surface of the clamp body 3 is formed with an upwardly recessed hole structure 33, and the piston 42 has a column structure 421 extending upward into the hole structure 33. The column structure 421 matches the shape of the hole structure 33 and is movably plugged in and fitted with each other up and down. Therefore, through the cooperation between the column structure 421 and the hole structure 33, the movement of the piston 42 can be limited, and the piston 42 can be guided to move smoothly up and down.

[0076] Furthermore, the hole structure 33 passes through the clamp body 3 from top to bottom and is coaxially arranged with the cycloid disk 1, and the positioning fixture also includes a loading and unloading auxiliary part 9. The loading and unloading auxiliary part 9 is configured in the hole structure 33 of the clamp body 3; the lower end of the loading and unloading auxiliary part 9 is detachably connected to the column structure 421 by thread, buckle or other means, and when it is necessary to form the center hole on the cycloid disk, the loading and unloading auxiliary part 9 can be removed so as not to interfere with the placement of the cycloid disk and the forming of the center hole; at the same time, after the center hole is formed, it is convenient to form a modular structure that can be moved as a whole by installing the loading and unloading auxiliary part 9 on the column structure 421, so as to facilitate the overall assembly and disassembly on the fourth axis turntable 2.

[0077] Specifically, the upper end of the loading and unloading auxiliary component 9 has an operable part, and the operable part is exposed above the clamping body 3. On the one hand, the operable part at the upper end of the loading and unloading auxiliary component 9 can be used to form a modular structure that can be moved as a whole, so as to facilitate the overall assembly and disassembly on the fourth-axis turntable 2; on the other hand, the loading and unloading auxiliary component 9 can be movable relative to the clamping body 3, thereby not affecting the up and down movement of the piston 42 relative to the clamping body 3.

[0078] Furthermore, the assembly process of the positioning fixture according to an embodiment of the present invention generally includes:

[0079] The O-ring 11 is embedded in the annular groove on the outer surface of the piston 42, and then the piston 42 carrying the O-ring 11 is placed in the inner cavity 411 of the cylinder 41. At this time, the O-ring 11 is tightly clamped between the piston 42 and the inner wall of the cylinder 41;

[0080] The four elastic members 10 are respectively sleeved on the outside of the corresponding transmission members 5, and the transmission members 5 are supported on the piston 42;

[0081] Four transmission members 5 are respectively mounted below the clamp body 3, and the positions of the four transmission members 5 correspond to the positions of the four positioning channels 32 of the clamp body 3, and the guide groove 51 of each transmission member 5 corresponds to the position of the guide pin 8 of the clamp body 3 (that is, the guide pin 8 is inserted into the guide groove 51);

[0082] The four locking pins 6, each of which is respectively provided with the expansion sleeve 7, are respectively passed through the positioning channels 32 of the clamp body 3 from top to bottom and are fixedly connected to the transmission member 5; of course, after the cycloid disk 1 is placed on the upper surface of the clamp body 3, the four locking pins 6, each of which is respectively provided with the expansion sleeve 7, are respectively passed through the positioning holes 1a and the positioning channels 32 corresponding to the positioning holes 1a from top to bottom and are fixedly connected to the corresponding transmission member 5.

[0083] Finally, the lower end of the loading and unloading auxiliary component 9 passes through the hole structure 33 of the clamp body 3 from top to bottom until it is fixedly connected with the column structure 421 of the piston 42, thereby completing the assembly of the entire positioning fixture.

[0084] It should be noted that the above assembly process is only a specific example and does not constitute a limitation of the present invention. Those skilled in the art can make reasonable changes to the order of the various steps according to actual needs, for example, first fix the locking pin 6 with the transmission member 5, and then mate the transmission member 5 with the clamp body, etc. Other changes are not enumerated.

[0085] Furthermore, the installation process of the positioning fixture on the fourth-axis turntable 2 according to an embodiment of the present invention generally includes:

[0086] Holding the operable portion of the loading and unloading auxiliary member 9, the positioning fixture is moved as a whole to place the positioning fixture at a pre-installed position on the fourth-axis turntable 2;

[0087] The clamp body 3 and the cylinder body 41 are fixedly assembled on the fourth-axis turntable 2 by fasteners, thereby completing the installation of the positioning fixture on the fourth-axis turntable 2.

[0088] Furthermore, the clamping and positioning process of the cycloid disk 1 by the positioning fixture of an embodiment of the present invention (that is, the application of the positioning fixture in the CNC drilling and milling of the cycloid disk) generally includes:

[0089] Before placing the cycloid disk 1, the expansion sleeve 7 and the locking pin 6 are separated from the transmission member 5 and set aside. At this time, the driving member 4 is started to operate, and the driving medium is introduced into the inner cavity 412 through the driving medium inlet and outlet 411. The piston 42 drives the transmission member 5 to move from bottom to top. During this process, the guide pin 8 of the clamp body 3 slides along the guide groove 51 of the transmission member 5, and the elastic member 10 is compressed and deformed;

[0090] Place the cycloid disk 1 on the upper surface 31 of the clamp body 3, and adjust the position of the cycloid disk 1 so that the four positioning holes 1a of the cycloid disk 1 correspond to the positions of the four positioning channels 32 respectively;

[0091] The four locking pins 6 respectively sleeved with the expansion sleeves 7 are respectively matched to the transmission member 5. Specifically, after the lower end of the rod portion 602 of the locking pin 6 passes through the positioning hole 1a and the positioning channel 32 from top to bottom, it is fixedly assembled on the upper end of the transmission member 5 by means of threads, buckles, etc. At this time, the cone portion 601 of the locking pin 6 and the expansion sleeve 7 are at least partially accommodated in the positioning hole 1a or slightly higher than the positioning hole 1a, and the outer surface of the expansion sleeve 7 just contacts the hole wall of the positioning hole 1a or is slightly separated from the hole wall of the positioning hole 1a;

[0092] The driving member 4 is stopped. At this time, driven by the elastic member 10, the transmission member 5 pulls the locking pin 6 to synchronously reset downward. During this process, the driving medium in the inner cavity 412 can be discharged through the driving medium inlet and outlet 411, and the piston 42 moves downward to reset. In addition, since the lower end surface is abutted by the limiting surface 321, the downward movement of the expansion sleeve 7 is blocked. The locking pin 6 moves downward relative to the expansion sleeve 7 and squeezes the expansion sleeve 7 outward, so that the expansion sleeve 7 expands radially outward, and then the expansion sleeve 7 tightly clamps the hole wall of the positioning hole 1a. The expansion sleeve 7 changes from the unlocked state to the locked state, that is, the positioning fixture completes the positioning and clamping of the cycloid disk 1.

[0093] Of course, the unlocking process of the cycloid disk 1 by the positioning fixture can be: starting the operation of the driving member 4, introducing the driving medium into the inner cavity 412 through the driving medium inlet and outlet 411, the piston 42 overcomes the elastic force of the elastic member 10, and drives the locking pin 6 from bottom to top through the transmission member 5. During this process, the cone 601 of the locking pin 6 gradually separates from the expansion sleeve 7 upward, so that the expansion sleeve 7 is radially retracted and reset to the unlocked state, so as to achieve the unlocking of the cycloid disk 1. At this time, the cycloid disk 1 can be removed upward.

[0094] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0095] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A positioning fixture for CNC drilling and milling of cycloid disks. It is characterized in that include: A clamping body, the upper surface of which can be used to support the cycloid disk, and has a positioning channel that passes through the clamping body from top to bottom, and the positioning channel corresponds to at least three positioning holes on the cycloid disk; At least three positioning components corresponding to at least three positioning holes one by one, each positioning component comprising a locking pin and an expansion sleeve sleeved on the locking pin, the locking pin having a tapered portion accommodated in the positioning hole, a rod portion connected to the lower portion of the tapered portion and accommodated in the positioning channel, at least part of the expansion sleeve being located in the tapered portion, and the expansion sleeve having a locking state in which the corresponding positioning hole is locked by radial expansion and an unlocking state in which the positioning hole is unlocked by resetting; and A driving assembly, which is used to drive the locking pin, and in the process of driving the locking pin to move up and down, the expansion sleeve switches between the locking state and the unlocking state; Wherein, the driving component comprises: A transmission member, a plurality of locking pins are connected to the transmission member, the transmission member comprises a transmission rod connected to the locking pin, and a boss located at the lower end of the transmission rod, the boss and the clamp body are spaced apart; A driving member, which drives the transmission member to drive the locking pin to move from bottom to top when starting the operation, and the boss of the transmission member is supported on the output end of the driving member; and An elastic member, in the process of the driving member driving the transmission member to move from bottom to top, the elastic member undergoes elastic deformation, and when the driving member stops, the elastic member acts on the transmission member to drive the locking pin to move from top to bottom, the elastic member is sleeved on the transmission rod, and the lower end of the elastic member abuts against the boss, and the upper end abuts against the clamp body.

2. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 1, It is characterized in that The cone portion has an outer surface that is inwardly contracted from top to bottom toward the center line of the locking pin, the expansion sleeve has a limited surface, and the clamp body has a limited surface; When the driving assembly drives the locking pin to move downward, the limiting surface abuts against the limited surface to stop the expansion sleeve from moving downward, and the expansion sleeve switches from the unlocked state to the locked state.

3. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 2, It is characterized in that The upper portion of the positioning channel has a step portion constituting the limiting surface, and the lower end of the expansion sleeve is accommodated in the positioning channel and abuts against the step portion.

4. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 1, It is characterized in that The driving member comprises: a cylinder having an inner cavity and relatively fixedly disposed below the clamp body; and, A piston disposed in the inner cavity and reciprocating up and down between the cylinder body and the clamp body; Wherein, the transmission member is arranged between the piston and the clamp body, and when the driving member starts to operate, the piston drives the transmission member to move upward.

5. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 4, It is characterized in that A hole structure concave upward is formed on the lower surface of the clamp body, and the piston has a column structure matching the shape of the hole structure, and the column structure movably extends into the hole structure up and down.

6. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 5, It is characterized in that The hole structure passes through the clamp body from top to bottom and is coaxial with the cycloid disk; The positioning fixture further comprises a loading and unloading auxiliary part, the lower end of which is connected to the column structure; the upper end of the loading and unloading auxiliary part has an operable part, and the operable part is exposed on the upper surface of the clamp body.

7. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 1, It is characterized in that The transmission member is connected to at least three locking pins in a one-to-one correspondence; The elastic member is a compression spring sleeved on the transmission rod.

8. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 1, It is characterized in that One of the clamp body and the transmission member is provided with a guide pin protruding laterally, and the other is provided with a guide groove extending in the up-down direction and matching with the guide pin.

9. The positioning fixture for CNC drilling and milling of cycloid disk according to claim 1, It is characterized in that The positioning channels correspond one-to-one to at least three of the positioning components.

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