A grinding machining clamping device

Abstract

The present invention relates to a grinding machining clamping device, which includes a positioning mandrel and a driving disk. The driving disk is rotatable, the positioning mandrel passes through the driving disk, and an elastically rotatable driving block is provided on the driving disk. The end of the driving block is provided with a positioning portion. When the positioning mandrel positions the middle hole of the needle valve body to be machined, the driving block rotates forward under the extrusion of the needle valve body to be machined. When the driving disk rotates to a certain position, the positioning portion enters the pin hole of the needle valve body to be machined under the action of elastic force, or drives other components connected to the positioning portion to enter the pin hole of the needle valve body to be machined, so that the driving block rotates reversely. The present invention does not require manual correction of the positions of the driving rod and the pin hole of the needle valve body. For variety processing switching, only the positioning mandrel and the driving block need to be replaced, which simplifies the operation of positioning the needle valve body and avoids the long-term radial impact and pressure on the driving pin.

Description

Technical Field

[0001] The present invention relates to the field of automation technology, and particularly to the clamping technology of needle valve bodies. Background Art

[0002] As Figure 1 shown, the needle valve body is a multi-stage cylindrical needle valve body with an outer circle. There is a central hole 11 at the center of its end face and a pin hole 12 at the eccentric position. During the grinding process, the needle valve body is positioned with the central hole 11 as the axis, and the grinding machine rotating shaft is connected to a driving sleeve with a pin to drive the needle valve body to rotate. In the traditional manual production process, the needle valve body is placed on the positioning shaft, and the needle valve body is rotated to align the pin hole 12 with the driving pin and insert it. The operation is cumbersome, and the driving pin is subject to long-term radial impact and pressure, resulting in a short service life. Summary of the Invention

[0003] The purpose of the present invention is to provide a grinding and machining clamping device to solve the problem that the service life is shortened in the prior art for clamping the needle valve body.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A grinding and machining clamping device includes a positioning mandrel and a driving disk. The driving disk is rotatable. The positioning mandrel passes through the driving disk. The driving disk is provided with an elastically rotatable driving block. The end of the driving block is provided with a positioning portion. When the positioning mandrel positions the central hole of the needle valve body to be processed, the driving block rotates forward under the extrusion of the needle valve body to be processed. When the driving disk rotates to a certain position, the positioning portion enters the pin hole of the needle valve body to be processed under the action of elastic force, or drives other components connected to the positioning portion to enter the pin hole of the needle valve body to be processed, causing the driving block to rotate backward.

[0006] According to the above technical means, it is no longer necessary to manually correct the positions of the driving rod and the pin hole of the needle valve body during clamping. For multi-variety processing switching, only the positioning shaft and the driving block need to be replaced. When loading manually or by a robot, since the needle valve body presses on the driving block, the driving block rotates. At this time, the driving block and the needle valve body are in flexible contact. After placing the needle valve body, the driving block rotates to a suitable position and becomes in rigid contact after inserting into the pin hole under the action of elastic force, thereby driving the needle valve body to rotate.

[0007] Further, it further includes a clamping mechanism. The clamping mechanism includes a clamping cylinder. The clamping cylinder is provided with a first slider and a second slider. The clamping cylinder can make the first slider and the second slider move towards or away from each other. The first slider and the second slider are respectively provided with a first roller and a second roller, so that they can clamp or loosen the needle valve body to be processed under the drive of the clamping cylinder.

[0008] According to the above technical means, due to the setting of the first roller and the second roller, and the actions of clamping and loosening the needle valve body controlled by the telescopic cylinder of the two, the needle valve body will not be over-positioned, making the part replacement process simple. By adjusting the clamping force with air pressure, the magnitude of the clamping force can be stably controlled.

[0009] Furthermore, the first roller and the second roller have the same height. The radial cross-sections of the first roller and the second roller are arranged obliquely with respect to the axial direction of the positioning mandrel, and the inclination angles of the two are the same, while the inclination directions are opposite.

[0010] Furthermore, the device further includes a proximity sensor and a slide bar. The slide bar is arranged on the driving disk, and the slide bar is lapped with one end of the driving block away from the positioning portion. The proximity sensor is fixedly arranged. When the driving block rotates forward, the slide bar extends out and triggers the proximity sensor. When the driving block rotates reversely, the slide bar retracts and does not trigger the proximity sensor.

[0011] Furthermore, the device is provided with a pressing mechanism. The pressing mechanism includes a pressing cylinder, and a conical tip is connected to the telescopic shaft of the pressing cylinder. The conical tip can extend out and press on the head shape of the needle valve body to be machined.

[0012] Furthermore, when the proximity sensor loses pulses, the pressing cylinder drives the conical tip to retract.

[0013] Furthermore, the positioning portion or other components connected to the positioning portion can move along the tangent direction of the pitch circle of the pin hole of the needle valve body to be machined.

[0014] Furthermore, both ends of the driving block are respectively provided with a first tip and a second tip. The first tip constitutes the positioning portion, and the second tip is lapped with the slide bar.

[0015] Furthermore, a stepped hole is provided on the driving disk. The slide bar is placed inside the stepped hole, and an elastic member is provided between the bottom of the slide bar and the step of the stepped hole.

[0016] Furthermore, the first tip is detachably connected to the driving block.

[0017] Advantages of the present invention:

[0018] The present invention does not require manual correction of the positions of the driving rod and the pin hole of the needle valve body. For variety processing switching, only the positioning mandrel and the driving block need to be replaced, simplifying the action of positioning the needle valve body and avoiding the long-term radial impact and pressure on the driving pin;

[0019] The present invention optimizes the clamping steps. Workers only need to sleave the needle valve body on the positioning mandrel, and rely on the telescopic cylinder to control the actions of clamping and loosening the needle valve body, saving human resources and reducing labor costs;

[0020] The present invention is provided with a proximity sensor and a slide bar for automatically detecting whether the driving block has completed the positioning of the pin hole. While simplifying manual operations, it replaces manual confirmation of the accurate position of the needle valve body, ensuring the safety of the new device.

[0021] The present invention is provided with a clamping mechanism. After the needle valve body is placed, the cylinder is used to clamp the needle valve body, and the motor is started to make the needle valve body and the driving block rotate relative to each other until the driving block is clamped into the pin hole of the needle valve body, completing the automatic clamping in place, further saving labor costs and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the needle valve body;

[0023] Figure 2 It is a schematic structural diagram of the device proposed in this embodiment;

[0024] Figure 3 It is a schematic diagram of clamping the needle valve body, including a driving mechanism and a clamping mechanism;

[0025] Figure 4 It is an exploded view of the driving mechanism;

[0026] Figure 5 It is a schematic diagram of the state where the driving block is not inserted into the pin hole;

[0027] Figure 6 It is a schematic diagram of the state where the driving block is inserted into the pin hole;

[0028] Figure 7 It is a schematic structural diagram of the clamping mechanism;

[0029] Figure 8 It is a schematic diagram of the cooperation mode between the needle valve body and the clamping mechanism, where A is the axis diagram of the first roller and the second roller; B is the axis diagram of the radial section of the needle valve body; C is the rotation direction of the needle valve body;

[0030] Figure 9 It is a schematic structural diagram of the clamping mechanism;

[0031] Figure 10 It is a state diagram of the device before the needle valve body is clamped;

[0032] Figure 11 It is a state diagram of the device after the needle valve body is clamped;

[0033] Figure 12 It is a schematic diagram of the driving disk rotating until the driving block is inserted into the pin hole and the spring plunger leaves the proximity sensor;

[0034] Figure 13 It is a schematic diagram of the driving disk rotating until the driving block is inserted into the pin hole;

[0035] Figure 14 It shows a schematic diagram of the state where the clamping mechanism clamps the needle valve body and the jacking cylinder retracts, indicating that the machining preparation is ready;

[0036] Figure 15 It is a schematic diagram of the state where the clamping mechanism clamps the needle valve body.

[0037] Among them, 1 - needle valve body; 11 - middle hole; 12 - pin hole; 2 - driving mechanism; 201 - Morse taper shank; 202 - positioning mandrel; 203 - left-handed bearing cover; 204 - bearing; 205 - left-handed bearing lock nut; 206 - driving disc; 207 - driving block; 2071 - first tip; 2072 - second tip; 208 - spare plate for driving pin; 209 - rotating shaft; 210 - sliding rod; 3 - clamping mechanism; 301 - clamping cylinder; 302 - first slider; 303 - second roller; 304 - first roller; 305 - second slider; 306 - workbench connecting plate; 4 - jacking mechanism; 401 - conical tip; 402 - jacking cylinder connecting plate; 403 - workbench connecting plate; 404 - M8 screw; 405 - locking nut; 406 - jacking cylinder bracket; 407 - jacking cylinder; 5 - workbench; 6 - proximity sensor. Specific embodiments

[0038] The following will illustrate the implementation mode of the technical solution of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0039] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0040] This embodiment proposes a grinding and machining clamping device, as Figure 2As shown in the figure, it is composed of a driving mechanism 2, a clamping mechanism 3, a pressing mechanism 4, a workbench 5 and a proximity sensor 6 installed on the spindle box. It is used for the grinding process of the needle valve body and is suitable for manual or robotic arm loading and unloading. The driving mechanism 2 replaces the traditional method, eliminating the need to align the position of the locating pin and the pin hole, thus improving the clamping speed. The addition of the clamping mechanism 3 significantly reduces the runout during the grinding of the head shape of the needle valve body. The actions and detections of the pressing mechanism 4 and the proximity sensor 6 ensure that the needle valve body is placed in place.

[0041] As Figure 3 shown in the figure, the schematic diagram of the combined positioning of the driving mechanism 2 and the clamping mechanism 3 for the needle valve body 1 in this embodiment. Among them, the driving mechanism 2 does not require a manual locating pin hole 12, and the clamping mechanism 3 is used to clamp and fix the needle valve body 1.

[0042] As Figure 4 shown in the figure, the driving mechanism 2 is composed of a Morse taper shank 201, a positioning mandrel 202, a left-handed bearing cover 203, a bearing 204, a left-handed bearing lock nut 205, a driving disc 206, a driving block 207, a driving pin spare plate 208, a rotating shaft 209, and a spring plunger 210. Among them, the Morse taper shank 201 is used to fix the positioning mandrel 202; the driving disc 206 is connected and fixed to the spindle motor. When the motor rotates, it drives the driving disc 206 to rotate, and the left-handed bearing cover 203 and the left-handed bearing lock nut 205 are tightened more and more under the action of friction, playing a role in preventing loosening and falling off. In this embodiment, the positioning mandrel 202 passes through the driving disc 206, and a bearing 204 is provided between the positioning mandrel 202 and the driving disc 206, so that when the driving disc 206 rotates, the positioning mandrel 202 does not rotate.

[0043] An elastically rotatable driving block 207 is provided on the driving disc 206, and the end of the driving block 207 is provided with a positioning portion. In this embodiment, the driving block 207 is connected to the driving disc 206 through a rotating shaft 209, so that the driving block 207 can rotate around the rotating shaft 209. The rotating shaft 209 is perpendicular to the driving disc 206 and passes through the middle of the driving block 207. In this embodiment, a torsion spring can be provided between the driving block 207 and the rotating shaft 209 to achieve the elastically rotatable movement of the driving block 207.

[0044] As Figure 5 and Figure 6 shown in the figure, the driving block 207 has a first tip 2071 and a second tip 2072. When the positioning mandrel 202 positions the middle hole 21, when the middle hole 21 of the needle valve body 1 is inserted onto the positioning mandrel 202 manually or by a manipulator, at this time, the needle valve body 1 presses against the driving block 207, driving the driving block 207 to rotate. In this embodiment, when the driving block 207 rotates, the first tip 2071 moves downward and the second tip 2072 moves upward.

[0045] When the driving disk 206 drives the driving block 207 to rotate, the first tip 2071 rotates along the tangent direction of the pitch circle of the pin hole 12 of the needle valve body 1. When the driving disk 206 rotates to a certain position, the first tip 2071 enters the inside of the pin hole 12 under the action of elastic force, thereby completing the positioning of the pin hole 12. At this time, the first tip 2071 constitutes the positioning portion.

[0046] In another embodiment, the first tip 2071 is connected with a pin, and when the pin rotates, it rotates along the tangent direction of the pitch circle of the pin hole 12 of the needle valve body 1, so that the pin can enter the pin hole 12 and complete the positioning of the pin hole 12. At this time, the pin is the positioning portion.

[0047] In this embodiment, a proximity sensor 6 is installed on the machine tool. The proximity sensor 6 is located above the driving disk 206. A slide bar 210 is provided on the driving disk 206. The slide bar 210 is arranged in the stepped hole of the driving disk 206. A spring is provided between the bottom of the slide bar 210 and the step of the stepped hole. The slide bar 210 and the spring form a spring plunger. The bottom of the slide bar 210 is lapped with the second tip 2072, or can be hinged. When the first tip 2071 moves downward, the second tip 2072 moves upward, so that the slide bar 210 can extend a certain distance. The slide bar 210 can enter the sensing range of the proximity sensor 6. When the first tip 2071 is inserted into the pin hole and the slide bar 210 retracts, the slide bar 210 does not enter the sensing range of the sensor 6. Since the driving disk 206 drives the slide bar 210 to rotate, when the proximity sensor 6 loses a pulse, the first tip 2071 enters the pin hole 12. When there is no pulse loss, it means that the first tip 2071 does not enter the pin hole 12.

[0048] In this embodiment, the first tip 2071 is detachably connected to the driving block 207, and is used to change the first tip 2071 with different sizes for needle valve bodies 1 of different specifications.

[0049] As Figure 7 shown, the clamping mechanism 3 includes a clamping cylinder 301. The clamping cylinder 301 is fixed on the workbench 5 through a workbench connecting plate 306. A first slider 302 and a second slider 305 are provided on the clamping cylinder 301. The clamping cylinder 301 can make the first slider 302 and the second slider 305 move towards or away from each other. First rollers 304 and second rollers 303 are respectively provided on the first slider 302 and the second slider 305. Under the drive of the clamping cylinder 301, they can clamp the needle valve body 1, and the clamping position is at the large outer circle of the needle valve body 1.

[0050] In this embodiment, the first slider 302 and the second slider 305 have the same height. In the axial direction of the positioning mandrel 202, the radial cross-sections of the first roller 304 and the second roller 303 are inclinedly arranged, and the inclination angles of both are the same, and the inclination directions are opposite. The inclination angle in this embodiment is 5°.

[0051] like Figure 8 As shown, after the first roller 304 and the second roller 305 clamp the positioned needle valve body 1, as the needle valve body 1 rotates (after the first tip 2071 extends into the pin hole), the needle valve body 1 drives the first roller 304 and the second roller 305 in the direction C shown in the figure, and the rollers press the needle valve body and vertically press the needle valve body downward at the same time, so that the needle valve body 1 contacts the upper side of the positioning mandrel 202 and rotates stably, so that the roller axis is higher than the needle valve body axis. Since the first roller 304 and the second roller 303 are arranged obliquely, and the two have the same inclination angle and opposite inclination direction, it can be known from the force analysis and the mutual action of the force that the needle valve body 1 rotates when being pressed by the first roller 304 and the second roller 305, an axial component force is generated, so that the bottom of the middle hole 21 always fits on the positioning surface of the positioning mandrel 202. The above characteristics of the device ensure the stability and consistency of the needle valve body 1 when grinding the head shape.

[0052] like Figure 9 As shown, the tightening mechanism 4 includes a conical top 401, a tightening cylinder connecting plate 402, a workbench connecting plate 403, an M8 screw 404, a locking nut 405, a tightening cylinder bracket 406 and a tightening cylinder 407. The mechanism connects the tightening cylinder 407 to the tightening cylinder connecting plate 402 with a nut, and the latter is connected to the tightening cylinder bracket 406 with four screws, and is subsequently connected to the workbench 5 through the workbench connecting plate 403. After the center hole 11 of the needle valve body 1 is placed on the positioning spindle 202, the tightening cylinder 407 extends out and presses the head shape 13 of the needle valve body 1 on the positioning spindle 202. After the proximity sensor 6 loses the pulse, the tightening cylinder 407 retreats.

[0053] The implementation method of this embodiment is as follows: Figures 10 - 15 As shown, wait until the needle valve body 1 is installed on the positioning spindle 202 manually or by a robot, the machine tool PMC controls the tightening cylinder 407 to push the conical top 401 to press against the needle valve body, the motor starts, and the screw connected to the spindle box rotates the drive disk 206 until the first tip 2071 of the drive block 207 is inserted into the pin hole 12. The motor keeps rotating, and the proximity sensor 6 determines that the drive pin has been inserted into the pin hole of the needle valve body through the state of the slide bar 210. The machine tool PMC controls the two rollers with opposite inclination angles of the clamping mechanism 3 to clamp the needle valve body 1. After clamping, the tightening cylinder 407 is controlled to retract, and preparations before processing are ready.

[0054] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A grinding machining clamping device, characterized in that: It includes a positioning mandrel (202), a driving disk (206), a clamping mechanism (3), a proximity sensor (6), a sliding rod (210) and a pressing mechanism (4). The driving disk (206) is rotatable. The positioning mandrel (202) passes through the driving disk (206). An elastically rotatable driving block (207) is provided on the driving disk (206). The end of the driving block (207) is provided with a positioning portion. When the positioning mandrel (202) positions the middle hole (11) of the needle valve body (1) to be machined, the driving block (207) rotates forward under the extrusion of the needle valve body (1) to be machined. When the driving disk (206) rotates to a certain position, the positioning portion enters the pin hole (12) of the needle valve body (1) to be machined under the action of elastic force, or drives other components connected to the positioning portion to enter the pin hole (12) of the needle valve body (1) to be machined, so that the driving block (207) rotates backward; The clamping mechanism (3) includes a clamping cylinder (301). A first slider (302) and a second slider (305) are provided on the clamping cylinder (301). The clamping cylinder (301) can make the first slider (302) and the second slider (305) move towards or away from each other. First rollers (304) and second rollers (303) are respectively provided on the first slider (302) and the second slider (305), so that they can clamp or loosen the needle valve body (1) to be machined under the drive of the clamping cylinder (301); The first roller (304) and the second roller (303) are of the same height. The radial cross-sections of the first roller (304) and the second roller (303) are arranged obliquely with respect to the axial direction of the positioning mandrel (202), and the two have the same inclination angle and opposite inclination directions; The sliding rod (210) is arranged on the driving disk (206). The sliding rod (210) is lapped with the end of the driving block (207) away from the positioning portion. The proximity sensor (6) is fixedly arranged. When the driving block (207) rotates forward, the sliding rod (210) extends out and triggers the proximity sensor (6). When the driving block (207) rotates backward, the sliding rod (210) retracts and does not trigger the proximity sensor (6); The pressing mechanism (4) includes a pressing cylinder (407). A conical tip (401) is connected to the telescopic shaft of the pressing cylinder (407). The conical tip (401) can extend out and press on the head shape of the needle valve body (1) to be machined; Both ends of the driving block (207) are respectively provided with a first tip (2071) and a second tip (2072). The first tip (2071) constitutes the positioning portion, and the second tip (2072) is lapped with the sliding rod (210).

2. The device according to claim 1, characterized in that: When the proximity sensor (6) loses a pulse, the pressing cylinder (407) drives the conical tip (401) to retract.

3. The device according to claim 1, characterized in that: The positioning part or other components connected to the positioning part can move along the pin hole (12) of the needle valve body (1) to be machined in the tangential direction of the indexing circle where the middle hole is located.

4. The device according to claim 1, characterized in that: A stepped hole is provided on the driving disk (206), the sliding rod (210) is placed inside the stepped hole, and an elastic member is provided between the bottom of the sliding rod (210) and the step of the stepped hole.

5. The device according to claim 1, characterized in that: The first tip (2071) is detachably connected to the driving block (207).

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