Needle-knife clamp and needle-knife grinding machine

Abstract

The utility model relates to a needle-knife clamp and a needle-knife grinding machine. A plurality of workpiece sleeves are arranged on a base plate of the needle knife clamp, the workpiece sleeves are located on the front side of the base plate and arranged on the same plane in parallel, sleeve through holes used for installing the workpiece sleeves are formed in the base plate, and the rear ends of the workpiece sleeves are detachably connected to the sleeve through holes of the base plate. A workpiece pressing device used for pressing the rear end of a workpiece forwards is arranged on the rear side of the base plate, a pressing plate of the workpiece pressing device is a V-shaped plate, and a workpiece sleeve can be a metal capillary tube. A main shaft system and a feeding system are arranged on a machine body of the needle-knife grinding machine, and a support plate used for clamping the workpiece clamp is connected to a feeding frame through an angle adjusting mechanism. The device is suitable for grinding slender pieces such as needle knives, and workpiece bending in the grinding process can be relieved or avoided.

Description

Technical Field

[0001] The utility model relates to a needle knife clamp and a needle knife grinder adopting the needle knife clamp. Background Art

[0002] The needle knife is an acupuncture instrument that combines an acupuncture needle and a scalpel into one. It has a handheld handle and a needle body, and the front end of the needle body is a blade. Because the needle knife is slender and made of metal, if a grinder is used to grind the edge, it is easy to bend, causing the blade to slide or shift on the grinding wheel, resulting in an uneven needle blade. Therefore, the scrap rate is high and the production efficiency is low. Therefore, it is necessary to develop special grinding equipment.

[0003] Chinese patent document CN107745293A discloses a needle head edge grinding device for a sterile needle knife, which is arranged on one side of a rotating station of a rotary feeder that clamps the sterile needle knife. It includes a bed, a walking bottom frame, a linear slide rail, a sliding rail seat, an upper grinding mounting plate, a lower grinding mounting plate, an upper grinding cylinder, a lower grinding cylinder, an upper grinding splint and a lower grinding splint. The upper grinding splint and the lower grinding splint are matched and closed to clamp the sterile needle knife arranged on the rotating station between the grinding parts of the two grinding splints. After the upper grinding splint and the lower grinding splint are closed, the blade of the sterile needle knife is ground as a whole. Chinese patent document CN110052927A discloses a special grinding tool for medicine feeding needle knives and a batch grinding processing method thereof. The needle tip is ground using a special grinding tool, and the special grinding tool includes a special fixture and a grinding installation tool; wherein: the special fixture is composed of two half molds of matching shapes after being clamped together; the grinding installation tool includes a mounting groove three and a workpiece support surface two; the mounting groove three is a downward groove on the upper surface of the grinding installation tool. By clamping the medicine feeding needle knives to be processed in batches in the special fixture, the grinding tool is used to assist in placing the medicine feeding needle knives, adjusting the medicine feeding needle knives, and clamping the molds to install them, and the grinding processing of medicine feeding needle knives with blade surfaces of different angles, symmetrical front and back blades, and no sharp corners on the left and right can be completed in simple and effective steps.

[0004] These existing technologies each have their own characteristics and can be used to implement the grinding of slender workpieces, but they are complex in structure and inconvenient to operate. In particular, the workpiece needs to extend a certain length from the mold, and to a certain extent, it is still easy to bend, which restricts the improvement of grinding quality. Therefore, in practice, high-quality grinding of such workpieces still relies on manual work. Not only is the grinding quality greatly affected by the personal factors of the operator, but the work efficiency is also low. Utility Model Content

[0005] The purpose of the utility model is to provide a needle knife fixture and a needle knife grinder using the needle knife fixture, so as to adapt to the grinding of slender parts such as needle knives, reduce or avoid the bending of the workpiece during the grinding process, and provide favorable conditions for improving the mechanized grinding quality of slender workpieces.

[0006] The technical solution of the utility model is: a needle knife fixture is provided with a base plate, a plurality of workpiece sleeves are provided on the base plate, the workpiece sleeves are located on the front side of the base plate, are arranged parallel to each other on the same plane, and form a row plate together with the base plate, and a sleeve through hole for installing the workpiece sleeve is provided on the base plate, and the rear end of the workpiece sleeve is detachably connected (connected in a detachable connection manner) to the sleeve through hole of the base plate.

[0007] Preferably, an internal thread is provided in the sleeve through hole, and an external thread is provided at the rear of the workpiece sleeve, which is threadedly connected to the sleeve through hole, thereby achieving a detachable connection of the rear end of the workpiece sleeve on the substrate.

[0008] Preferably, in the above situation, the rear end of the workpiece sleeve is aligned with the rear end of the sleeve through hole of the substrate.

[0009] Preferably, in the above situation, the rear port of the workpiece sleeve is provided with a chamfered structure, or in other words, the rear port is a conical (frustum-shaped) mouth / bell mouth, so as to facilitate the insertion of the slender piece.

[0010] Preferably, the sleeve through hole is a stepped hole, that is, divided into two sections, front and rear, both of which are equal-diameter holes, wherein the aperture of the front section is larger than the aperture of the rear end and is adapted to the outer diameter of the workpiece sleeve. The rear end of the workpiece sleeve is inserted into the front section of the sleeve through hole and tightly fits with the sleeve through hole, thereby achieving a detachable connection of the rear end of the workpiece sleeve to the substrate. The tightness of the fit between the rear end of the workpiece sleeve and the front end of the sleeve through hole should allow manual insertion and removal of the workpiece sleeve, but after insertion, it will not move or fall out due to external forces during operation.

[0011] Preferably, in the above situation, the rear end of the workpiece sleeve abuts against the annular end surface between the front and rear ends of the sleeve through hole, thereby forming a limit / positioning for the workpiece sleeve.

[0012] Preferably, in the above situation, the aperture of the rear section of the sleeve through hole is not larger than the rear end aperture of the workpiece sleeve.

[0013] Preferably, in the above situation, the rear port of the sleeve through hole is provided with a chamfered structure, or in other words, the rear port is a conical (frustum-shaped) mouth / bell mouth, so as to facilitate the insertion of the slender member.

[0014] Preferably, the workpiece sleeve is a metal tube with required rigidity to avoid bending during the grinding process. For example, the workpiece sleeve is a capillary tube made of metal.

[0015] Preferably, a workpiece pressing device for pressing the rear end of the workpiece forward is provided on the rear side of the base plate.

[0016] Preferably, the workpiece clamping device includes a pressure plate and a clamping screw (stud or bolt), the clamping screw is perpendicular to the base plate, and its front end is connected (fixedly connected or axially limited) to the base plate, and the pressure plate is sleeved on the clamping screw through the screw through hole on the pressure plate, and the rear end of the clamping screw is exposed from the rear side of the pressure plate and is screwed (threadedly connected) with a clamping nut.

[0017] Preferably, the number of the compression screws is at least two, and the two compression screws are respectively located at two side positions (two side positions of the pressure plate and the base plate) to facilitate balance.

[0018] The compression nut can be a butterfly nut to facilitate operation.

[0019] Preferably, an elastic pad, such as a rubber pad, is provided between the compression nut and the pressure plate to prevent the compression nut from loosening during operation.

[0020] The rubber pad or other elastic pad can be in the form of a washer and sleeved on the compression screw.

[0021] Preferably, the workpiece clamping device includes a pressure plate and a pressure plate guide rod, the pressure plate guide rod is perpendicular to the base plate, and its front end is fixed on the base plate, the pressure plate is sleeved on the pressure plate guide rod through a guide through hole or a guide sleeve on the pressure plate, and the guide through hole or the guide sleeve is slidably matched with the pressure plate guide rod, allowing the pressure plate to slide along the guide rod direction and not allowing it to rock on the guide rod, the rear end of the pressure plate guide rod is exposed from the rear side of the pressure plate and is provided with a pressure plate limiting structure (for example, a baffle that can stop the pressure plate from moving further backward), and a tension spring (for example, a pre-stretched coil spring) is sleeved on the pressure plate guide rod, the front end of the tension spring is connected to the base plate, and the rear end is connected to the pressure plate, pulling the pressure plate toward the base plate, thereby pressing the pressure plate tightly on the rear end of the workpiece exposed from the rear end of the sleeve through hole.

[0022] Preferably, the number of the pressure plate guide rods is at least two, and the two pressure plate guide rods are respectively located at two side positions (two side positions of the pressure plate and the base plate) to facilitate balance.

[0023] Preferably, the pressure plate is a V-shaped plate, or in other words, has a V-groove structure, with a cross-section that is convexly V-shaped. When the pressure plate is pressed against the rear end of the workpiece, the rear end of the workpiece is located in the V-groove, thereby automatically achieving centering and stabilization, and preventing the pressure plate from tilting or the rear end of the workpiece from sliding sideways.

[0024] A needle knife grinder is provided with a bed (or frame), on which a spindle system (or grinding wheel system) and a feed system (or workpiece system) are provided. The spindle system includes a spindle motor and a grinding wheel shaft. The spindle motor is connected to the grinding wheel shaft through a spindle transmission mechanism (for example, a belt transmission mechanism). A cylindrical grinding tool (grinding wheel) is provided on the grinding wheel shaft. The feed system includes a linear feed mechanism. The driven member (output member, for example, feed frame) of the linear feed mechanism is a horizontal (perpendicular to the feed direction) feed frame. A bracket plate is provided on the bracket plate. A fixture clamping device for clamping a workpiece fixture is provided on the bracket plate. The workpiece fixture adopts any one of the needle knife fixtures disclosed in the present utility model.

[0025] Preferably, the support plate is connected to the feed frame via an angle adjustment mechanism to adjust the grinding angle of the cutting edge.

[0026] Preferably, both ends of the support plate are provided with claws for clamping the workpiece fixture, and are provided with clamping plates for pressing the clamped part onto the claws.

[0027] Before grinding, the main parts of multiple slender pieces to be ground are respectively inserted into different workpiece sleeves through different threaded through holes, and the rear end of each slender piece is pressed forward by a workpiece clamping device so that each slender piece is fixed together with its own workpiece sleeve. The length of the workpiece sleeve is adapted to the length of the main part of the slender piece, so that the front edge of the slender piece does not exceed the front end of the workpiece sleeve.

[0028] The beneficial effects of the present invention are as follows: since the workpiece sleeve is ground together with the workpiece, the slender workpiece is always kept in the capillary during the grinding process, and the support of the capillary avoids or significantly reduces the bending of the workpiece during the grinding process, which is conducive to improving the grinding quality; since the workpiece sleeve is connected to the base plate in a detachable connection manner, it is easy to replace; since the workpiece sleeve can adopt commercially available metal capillaries or other existing products, the cost is low; since a pressure plate is provided to press the rear end of the workpiece, the workpiece is pressed tightly by a thread, which ensures that the workpiece and the capillary are strictly synchronized during the grinding process, and the workpiece will not be bent due to the grinding pressure The rear movement ensures the grinding of the front end of the workpiece; since multiple groups of capillaries and workpieces can be assembled in the same fixture and a cylindrical grinding wheel shaft is used for grinding, multiple workpieces can be synchronously ground at the same time, which greatly improves the processing efficiency; since a linear feed mechanism is used to implement the linear feed of the fixture and an angle adjustment mechanism is used to adjust the grinding angle of the workpiece, the grinding angle and grinding speed can be controlled according to the process requirements, which is suitable for the grinding requirements of different workpiece blades. Compared with existing ordinary and special grinders, the structure of the grinder and tooling is significantly simplified, which is convenient for operation or control and is conducive to reducing system errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the workpiece fixture involved in the utility model (front view);

[0030] Figure 2 It is a schematic diagram of the workpiece fixture involved in the utility model (side view);

[0031] Figure 3 Schematic diagram of the capillary tube involved in the present invention (front view);

[0032] Figure 4 is a schematic diagram of the grinding machine involved in the present utility model (front view);

[0033] Figure 5 is a schematic diagram of the grinding machine involved in the utility model (top view);

[0034] Figure 6 This is a schematic diagram of the grinding motor and its connection with the belt transmission mechanism involved in the utility model;

[0035] Figure 7 It is a schematic diagram of the grinding wheel shaft involved in the utility model;

[0036] Figure 8 This is a schematic diagram of the clamp operating mechanism involved in the utility model.

[0037] Figure 9 It is a schematic diagram of the grinding machine involved in the utility model (left view). DETAILED DESCRIPTION

[0038] See also Figures 1-9 The workpiece fixture primarily consists of a pressure plate 24, a base plate 21, and several workpiece sleeves 22 for securing the workpiece. The sleeves can be made of thin metal tubes with the required rigidity, such as commercially available capillaries. Their diameter matches the main body of the workpiece (elongated piece), allowing for manual insertion and removal. The sleeves secure the inserted workpiece within the tube's aperture, preventing it from shaking or eccentric movement.

[0039] The main body of the elongated member is elongated (e.g., cylindrical) with a cutting edge at the front. The rear portion (e.g., the handle of a needle knife) 13 is thicker than the main body and cannot be inserted into the workpiece sleeve. The workpiece sleeve (e.g., a capillary tube) has an aperture that is compatible with the main body of the elongated member, as long as it allows the main body of the elongated member to be inserted and removed. The gap between the two should be minimized to prevent eccentricity or wobbling of the main body of the elongated member within the tube, which could affect machining quality. In this case, the gap between the two can be referred to as zero gap or near-zero gap.

[0040] Multiple workpiece sleeves are set on the same fixture to enable multiple workpieces to be ground synchronously during the same operation.

[0041] Since the workpiece sleeve is ground together with the workpiece, it is necessary to replace the workpiece sleeve. The rear end (provided with external threads) 27 of the workpiece sleeve is screwed (threadedly connected) to the threaded through hole of the base plate to facilitate installation and removal.

[0042] The rear port of the workpiece sleeve is chamfered to form a small cone (cone-shaped) mouth (or trumpet mouth) to facilitate the insertion of the workpiece, and its cone angle β can be about 90°.

[0043] The pressure plate adopts a V-shaped groove structure, with the middle of the front side concave backward. When pressed on the rear end of the workpiece, the rear end of the workpiece automatically aligns to the center of the V-shaped groove and is in a stable state, thereby avoiding the rear end of the workpiece from deflecting or slipping due to factors such as the side tilt of the pressure plate.

[0044] Two (or more) compression screws (studs) 23 can be provided to realize the connection between the pressure plate and the base plate. The rear of the workpiece is clamped between the pressure plate and the base plate. The workpiece can be compressed by tightening the compression nut 26 located on the rear side of the pressure plate. After the rear of the thicker workpiece is compressed, it is stuck in the rear end of the threaded through hole on the base plate or the rear end of the workpiece sleeve (depending on the relative thickness of the rear part of the workpiece and the screw through hole), thereby fixing the workpiece.

[0045] Before screwing the compression nut, first put the rubber pad (washer) 25 on the screw. After tightening the compression nut, the rubber pad between the compression nut and the pressure plate is compressed and deformed to prevent the compression nut from loosening due to vibration during operation.

[0046] The compression screw can be a stud, or a single-head bolt or any other suitable rod-shaped object that can cooperate with the thread of the compression nut. Any suitable technology can be used to achieve the connection between the lower end of the screw and the base plate. The connection can be a fixed connection (for example, welding) or a limiting connection (limiting the screw from being withdrawn backward from the base plate). For example, the head of the single-head bolt is placed on the front side of the base plate, and a flare that conforms to the bolt head and limits the rotation of the bolt can be provided at the front end of the through hole on the base plate for passing the bolt.

[0047] The grinding tool 35 in the grinding machine is cylindrical, with shaft extensions at both ends for mounting bearings (at both ends) and a driven wheel 34 (at one end) attached to the belt drive mechanism 33. This tool is referred to as the grinding wheel spindle. The spindle motor 32 drives the grinding wheel spindle via the belt drive mechanism. The feed mechanism's feed direction is perpendicular to the grinding wheel spindle's axis, and the axial directions of the workpiece sleeves are also perpendicular (non-planar) to the grinding wheel spindle's axis. This allows the feed mechanism to control the grinding progress, enabling simultaneous grinding of multiple workpieces (and the sleeves encased therein) mounted on a workpiece fixture.

[0048] The linear feed mechanism is provided with a feed frame 37 serving as an output member, and the feed frame moves linearly. The linear feed mechanism can adopt any linear motion mechanism, for example, a linear guide mechanism and a corresponding drive motor. As a preferred embodiment, the linear feed mechanism can include two longitudinal (along the feed direction) parallel light rods (for example, cylindrical shafts) 36 and a feed frame (or beam) 37 perpendicular to the light rods. The light rods are fixedly mounted on the bed (table) 31 through light rod brackets. The feed frame is located above the light rods, and bearing seats 38 are provided below the two sides thereof. Auxiliary parts such as positioning screws 39 for positioning the bearing seats are provided. Linear bearings that cooperate with the corresponding side light rods are installed on the bearing seats, thereby realizing a longitudinal movement connection between the feed frame and the light rods. The drive of the feed frame can be achieved based on existing technology or any other suitable technology. For example, a screw-nut mechanism and a feed motor for driving the screw are set up, the nut of the screw-nut mechanism is fixedly mounted on the feed frame, the screw is rotatably mounted on the bed and is connected to the feed motor drive, the screw is driven to rotate by the feed motor, and then the feed frame is driven to move by the nut; or a feed cylinder / pneumatic cylinder is set on the bed to drive the feed frame to move.

[0049] The feed frame is equipped with an angle adjustment mechanism, which drives the support plate 41 to adjust its posture / angle. For example, the feed frame is rotatably connected to an angle adjustment shaft 47 via a bearing. An angle adjustment motor is installed on the feed frame to drive the angle adjustment shaft. The support plate is fixedly connected to the angle adjustment shaft via a connector (connecting plate) 43. The angle adjustment motor thus controls and adjusts the support plate's angle.

[0050] The claws at both ends of the bracket plate extend forward of the bracket plate. These claws are equipped with stopper steps for engaging the corresponding side edges of the base plate (the base plate of the workpiece fixture). The L-shaped structures on the surfaces of the two stopper steps face each other, and the clamping plates 42 are located on the outside of the stopper steps and fixed to the corresponding claws via clamping plate screws. During use, the two side edges of the base plate of the workpiece fixture are placed in the L-shaped structure, fitting them to the surface of the L-shaped structure. The clamping plates are pressed against the outside of the edge of the base plate and tightened with the clamping plate screws, clamping the two side edges of the base plate between the stopper steps and the clamping plates on the corresponding sides. After the workpiece fixture is installed in place, the pressure plate is located in the space between the two jaws. The length of the pressure plate should usually be less than the length of the base plate and be able to cover / press the entire workpiece sleeve to adapt to the space between the two jaws. The workpiece sleeve extends forward and is tilted downward at a corresponding angle according to the angle adjustment of the rotating shaft, toward the grinding wheel shaft. The setting height of the grinding wheel shaft is lower than the height of the feed frame. Through the feed movement of the feed frame, the front end of the workpiece sleeve and the workpiece are brought into contact with the abrasive surface of the grinding wheel shaft to implement grinding at the corresponding angle.

[0051] Unless otherwise specified or when one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different specific implementation methods.

Claims

1. Needle knife fixture, characterized by A base plate is provided, on which a plurality of workpiece sleeves are provided. The workpiece sleeves are located on the front side of the base plate and are arranged parallel to each other on the same plane. The base plate is provided with sleeve through holes for installing the workpiece sleeves. The rear ends of the workpiece sleeves are detachably connected to the sleeve through holes of the base plate.

2. The needle knife fixture according to claim 1, characterized in that An internal thread is provided in the sleeve through hole, and an external thread is provided at the rear of the workpiece sleeve, which is threadedly connected to the sleeve through hole, thereby achieving a detachable connection of the rear end of the workpiece sleeve on the base plate.

3. The needle knife fixture according to claim 2, characterized in that The rear end of the workpiece sleeve is aligned with the rear end of the sleeve through hole of the substrate, and the rear end of the workpiece sleeve is provided with a chamfered structure.

4. The needle knife fixture according to claim 1, characterized in that The sleeve through hole is divided into two sections, front and rear sections, both of which are equal-diameter holes, wherein the aperture of the front section is larger than the aperture of the rear end and is adapted to the outer diameter of the workpiece sleeve. The rear end of the workpiece sleeve is inserted into the front section of the sleeve through hole and fits tightly with the sleeve through hole.

5. The needle knife fixture according to claim 4, characterized in that The rear end of the workpiece sleeve rests on the annular end surface between the front and rear ends of the sleeve through hole. The aperture of the rear section of the sleeve through hole is not larger than the rear end aperture of the workpiece sleeve. The rear end of the sleeve through hole is provided with a chamfered structure.

6. The needle knife fixture according to any one of claims 1 to 5, characterized in that The workpiece sleeve is a metal tube with required rigidity.

7. The needle knife fixture according to any one of claims 1 to 5, characterized in that A workpiece pressing device for pressing the rear end of the workpiece forward is provided on the rear side of the base plate.

8. The needle knife fixture according to claim 7, characterized in that The cam is secured to the rear of the two guide rails and is secured to the base with a spring that is fixed to the base over the other guide rails.

9. The needle knife fixture according to claim 8, characterized in that The pressing plate is a V-shaped plate, and its cross section is a backward convex V-shape.

10. Needle knife grinding machine, with a bed, characterized in that The bed is provided with a spindle system and a feed system, the spindle system includes a spindle motor and a grinding wheel shaft, the spindle motor is connected to the grinding wheel shaft through a spindle transmission mechanism, a cylindrical grinding tool is provided on the grinding wheel shaft, the feed system includes a linear feed mechanism, the follower of the linear feed mechanism is a horizontal feed frame, the feed frame is provided with a bracket plate, the bracket plate is connected to the feed frame through an angle adjustment mechanism, the bracket plate is provided with a fixture clamping device for clamping a workpiece fixture, and the workpiece fixture adopts the needle knife fixture described in any one of claims 1-9.

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