Chuck for a lathe

Abstract

A chuck for lathe comprises a shell and several groups of driving mechanisms; a plurality of pairs of sliding grooves are arranged radially around the center on the working surface of one side of the shell; a clamping jaw is slidably arranged in the sliding groove; a through groove is arranged in the bottom of the sliding groove and penetrates the interior of the shell; the several groups of driving mechanisms are arranged in the interior of the shell, and each group of driving mechanisms penetrates the through groove and simultaneously controls a pair of clamping jaws to slide towards or away from each other in the sliding groove. The problem of low efficiency and poor accuracy when clamping and centering asymmetric workpieces is solved.

Description

Technical Field

[0001] This utility model relates to the field of lathe machining equipment technology, and more specifically, to a lathe chuck. Background Technology

[0002] A lathe chuck is a device used to clamp workpieces and has wide applications in the machining field. Existing three-jaw chucks achieve automatic centering through the synchronous movement of three jaws, which is suitable for axisymmetric workpieces, but it is difficult to achieve centering for some rectangular or eccentric parts. When using a four-jaw chuck for positioning, each jaw can be adjusted independently, but repeated correction is required during centering, which is inefficient and has poor centering accuracy. Utility Model Content

[0003] The purpose of this invention is to provide a lathe chuck that solves the problems of low efficiency and poor accuracy when clamping and centering asymmetrical workpieces.

[0004] The embodiments of this utility model are achieved through the following technical solutions:

[0005] A lathe chuck, comprising:

[0006] The housing has several pairs of sliding grooves arranged radially around the center on one side of the working surface; a pawl is slidably disposed in the sliding groove; and a through groove is provided at the bottom of the sliding groove, penetrating the interior of the housing.

[0007] Several sets of drive mechanisms are located inside the housing. Each set of drive mechanisms passes through a through groove and simultaneously controls a pair of claws to slide towards or away from each other in their slide groove.

[0008] The driving mechanism includes a gear driven by a driving unit, two toothed plates, and two connecting seats. A fixed shaft is provided inside the housing, with its axis aligned with the normal to the center of the working surface. The gear's mounting hole is fitted onto the fixed shaft, allowing it to rotate around its axis. The two connecting seats are slidably disposed in through slots on either side of the normal. One end of each connecting seat near the working surface passes through the through slot and connects to a chuck. One end of each toothed plate meshes with the two sides of the gear, and the other end connects to the end of the connecting seat furthest from the working surface. When the driving unit drives the gear to rotate, it moves the toothed plates on both sides of the gear, causing the chuck to slide towards or away from each other via the connecting seats at one end of the toothed plates.

[0009] The housing is also provided with a limiting plate, which fits against the side of the toothed plate away from its tooth surface.

[0010] The limiting plate is provided with a limiting strip; the toothed plate is provided with a limiting groove on the side away from its tooth surface; the limiting strip is slidably embedded in the limiting groove.

[0011] The drive unit includes a worm gear and a worm that mesh with each other; the mounting hole of the worm gear is fitted onto the fixed shaft, and one side of the worm gear is connected to one side of the gear plate; the housing has a side hole on the side wall adjacent to the working surface; the end of the worm has an operating end that is rotatably disposed in the side hole; the operating end has an operating groove.

[0012] The housing also includes a bushing, which is fitted onto the worm gear.

[0013] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0014] 1. A lathe chuck of this utility model realizes the synchronous movement of two opposing jaws in opposite directions through a drive mechanism. By moving multiple pairs of jaws in opposite directions, the centering function of the workpiece is ensured and the machining accuracy of the workpiece is improved.

[0015] 2. This utility model discloses a lathe chuck that, by rotating a gear, drives the meshing gear plates on both sides of the gear to move, thereby achieving synchronous movement of two opposing jaws and ensuring the centering effect of the workpiece; and by driving the gear through the meshing worm gear and worm, the driving method of the worm gear and worm can greatly improve the torque and has self-locking performance, reducing rotation while improving the clamping force. By rotating the operating end located in the side hole, the operating wrench can be embedded in the operating groove on the operating end, which can easily rotate the worm, thereby driving the worm gear to rotate and realizing the movement of the jaws;

[0016] 3. A lathe chuck of this utility model has a limiting plate inside the housing, which is attached to the side of the tooth plate away from its tooth surface. The limiting plate has a limiting strip and a limiting groove on the side of the tooth plate away from its tooth surface. The limiting strip is slidably embedded in the limiting groove, so that the tooth plate moves along the limiting strip, which further improves the stability of the chuck movement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 It is attached Figure 1 Sectional view at point aa;

[0019] Figure 3 It is attached Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 It is attached Figure 1 Sectional view at point bb;

[0021] Figure 5 It is attached Figure 4 Enlarged view of section B in the middle.

[0022] In the figure, 1-shell, 101-rear cover, 102-slide groove, 103-through groove, 104-side hole, 105-fixed shaft, 106-limiting plate, 107-shaft sleeve, 201-connecting plate, 202-tooth plate, 203-gear, 204-worm gear, 205-worm, 206-operating end, 207-connecting seat, 3-claw. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] like Figure 1 and 2 As shown, a lathe chuck includes a housing 1 and several sets of drive mechanisms. The housing 1 is a support component of an integral structure, and its shape is disc-shaped. The working surface on its front side is used to install jaws 3 and contact the workpiece. On the working surface, several pairs of sliding grooves 102 are arranged radially around the center. The number of sliding grooves 102 is preferably two pairs of four, and jaws 3 are slidably installed in each of the four sliding grooves 102. It should be noted that the jaws 3 are existing devices, used only for clamping and fixing workpieces, and are not an improvement of this utility model, so they will not be described in detail here. The bottom of the sliding groove 102 is provided with a through groove 103 that penetrates the interior of the housing 1, through which the drive mechanism passes to connect to the jaws 3, thereby controlling the jaws 3 to move along the sliding groove 102.

[0026] The number of drive mechanisms corresponds to the number of slides 102. Each set of drive mechanisms is used to control the synchronous movement of a pair of jaws 3. Preferably, there are two sets of drive mechanisms, which are located inside the housing 1. When clamping a workpiece, one set of drive mechanisms controls a pair of jaws 3 to move synchronously towards each other and contact the workpiece, so that the workpiece is centered along the moving direction of the pair of jaws 3. Then, another set of drive mechanisms controls another pair of jaws 3 to move synchronously towards each other and contact the workpiece, so that the workpiece is centered along the moving direction of the pair of jaws 3, thereby achieving the centering clamping of asymmetrical workpieces.

[0027] like Figure 2 and3 The diagram shows a schematic of a drive mechanism. In one embodiment, the drive mechanism includes a gear 203 driven to rotate by a drive unit, two gear plates 202, and two connecting seats 207. A fixed shaft 105 is provided inside the housing 1, with its axis aligned with the normal to the center of the working surface. The fixed shaft 105 is used to fix the drive mechanism. The mounting hole of the gear 203 is fitted onto the fixed shaft 105, allowing it to rotate freely around the axis of the fixed shaft 105. The two connecting seats 207 are slidably disposed in the through grooves 103 on opposite sides of the normal. One end of the connecting seat 207 near the working surface passes through the through groove 103 and is fixedly connected to the bottom of the chuck 3 by bolts or welding. The two gear plates... The tooth surfaces of 202 mesh with gear 203 respectively. The end of the toothed plate 202 away from gear 203 is connected to the end of the connecting seat 207 away from the working surface. The gear 203 is driven to rotate by the drive unit. Due to the meshing action between gear 203 and the two toothed plates 202, the toothed plates 202 on both sides of gear 203 will move in opposite directions. When it is necessary to clamp the workpiece, gear 203 rotates counterclockwise, the left toothed plate 202 moves downward and the right toothed plate 202 moves upward. The connecting seat 207 drives the corresponding pawls 3 to slide towards each other in the slide groove 102 to clamp the workpiece. Conversely, when gear 203 rotates clockwise, the pawls 3 slide away from each other to release the workpiece.

[0028] Specifically, in order to improve the stability of the movement of the toothed plate 202, a limiting plate 106 is also provided inside the housing 1. The limiting plate 106 is attached to the side of the toothed plate 202 away from its tooth surface, and the two ends of the limiting plate 106 are respectively fixedly connected to the inner sidewall of the housing 1.

[0029] Specifically, in order to further improve the stability of the movement of the toothed plate 202, the limiting plate 106 is provided with a limiting strip extending along the movement direction of the toothed plate 202; a limiting groove is provided on the side of the toothed plate 202 away from its tooth surface, and the limiting strip is slidably embedded in the limiting groove to prevent the toothed plate 202 from shifting or shaking during the movement.

[0030] like Figure 2-5 As shown, the drive unit is used to drive the gear 203 to rotate. It needs to have a certain self-locking ability and be able to amplify the driving torque. Therefore, a worm gear 204 and worm 205 structure can be selected for drive.

[0031] In one embodiment, the drive unit includes a worm gear 204 and a worm 205 that mesh with each other; the mounting hole of the worm gear 204 is sleeved on the fixed shaft 105, and one side of the worm gear 204 is fixedly connected to one side of the gear 203 by a key connection or other means, thereby realizing the synchronous rotation of the worm gear 204 and the gear 203; in order to operate the worm 205 and make it rotate, an operating end 206 is provided at the end of the worm 205, and a side hole 104 is provided on the side wall of the housing 1 adjacent to the working surface; so that the end of the worm 205 is rotatably disposed in the side hole 104, and is supported and positioned by a bearing; an operating groove is provided on the outer end face of the operating end 206, which is preferably an internal hexagonal groove, so as to use a corresponding operating wrench, preferably an internal hexagonal wrench is embedded in the internal hexagonal groove, to rotate the operating end 206, thereby driving the worm 205 to rotate;

[0032] When it is necessary to clamp or release the workpiece, the operating end 206 is rotated by the tool, which drives the worm 205 to rotate. Due to the meshing of the worm 205 and the worm wheel 204, the worm wheel 204 will rotate around the axis of the fixed shaft 105, which in turn drives the gear 203 to rotate, and finally realizes the synchronous movement of the chuck 3.

[0033] Specifically, the housing 1 is also provided with a bushing 107, which is sleeved on the worm 205 to reduce the offset or shaking of the worm 205 during rotation; because a pair of limiting plates 106 for limiting the sliding direction of the gear plate 202 are located on both sides of the gear 203 and the pair of limiting plates 106 are parallel to each other; therefore, the bushing 107 is set on the side of the limiting plate 106 close to the worm 205.

[0034] The working principle of this embodiment is as follows:

[0035] This utility model discloses a lathe chuck. When it is necessary to clamp a workpiece, an Allen wrench is used to rotate the operating end 206, which drives the worm gear 204 to rotate via the worm 205, and then drives the gear 203 to rotate. The rotation of the gear 203 causes the toothed plates 202 on both sides to move towards each other. Through the connecting seat 207, the jaws 3 are driven to slide towards each other synchronously in the slide groove 102 until the jaws 3 approach and fit against the workpiece. Then, another pair of jaws 3 is controlled to move towards each other and fit against the workpiece. Since multiple pairs of jaws 3 achieve radial clamping of the workpiece from different directions, it ensures that the center of the workpiece coincides with the center of the chuck, thereby ensuring the centering function of the workpiece.

[0036] When it is necessary to release the workpiece, rotate the operating end 206 in the opposite direction to make the gear 203 rotate in the opposite direction, and the toothed plate 202 and the chuck 3 slide in opposite directions to release the workpiece.

[0037] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A chuck for a lathe, characterized in that, include: The housing has several pairs of sliding grooves arranged radially around the center on one side of the working surface; a pawl is slidably disposed in the sliding groove; and a through groove is provided at the bottom of the sliding groove, penetrating the interior of the housing. Several sets of drive mechanisms are located inside the housing. Each set of drive mechanisms passes through a through groove and simultaneously controls a pair of claws to slide towards or away from each other in their slide groove.

2. A chuck for a lathe according to claim 1, characterized in that The driving mechanism includes a gear driven by a driving unit, two toothed plates, and two connecting seats. A fixed shaft is provided inside the housing, with its axis aligned with the normal to the center of the working surface. The gear's mounting hole is fitted onto the fixed shaft, allowing it to rotate around its axis. The two connecting seats are slidably disposed in through slots on either side of the normal. One end of each connecting seat near the working surface passes through the through slot and connects to a chuck. One end of each toothed plate meshes with the two sides of the gear, and the other end connects to the end of the connecting seat furthest from the working surface. When the driving unit drives the gear to rotate, it moves the toothed plates on both sides of the gear, causing the chuck to slide towards or away from each other via the connecting seats at one end of the toothed plates.

3. A chuck for a lathe according to claim 2, wherein The housing is also provided with a limiting plate, which fits against the side of the toothed plate away from its tooth surface.

4. A lathe chuck according to claim 3, characterized in that, The limiting plate is provided with a limiting strip; the toothed plate is provided with a limiting groove on the side away from its tooth surface; the limiting strip is slidably embedded in the limiting groove.

5. A lathe chuck according to claim 2, characterized in that, The drive unit includes a worm gear and a worm that mesh with each other; the mounting hole of the worm gear is fitted onto the fixed shaft, and one side of the worm gear is connected to one side of the gear plate; the housing has a side hole on the side wall adjacent to the working surface; the end of the worm has an operating end that is rotatably disposed in the side hole; the operating end has an operating groove.

6. A lathe chuck according to claim 5, characterized in that, The housing also includes a bushing, which is fitted onto the worm gear.

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