Handheld external thread machining assembly

Abstract

The invention relates to the technical field of machining, in particular to a handheld external thread machining assembly which comprises a shell and a threading die quick-changing structure, and the threading die quick-changing structure comprises a threading die and a threading die bush arranged in the shell and used for mounting the threading die. The clamping structure is used for positioning a workpiece to be machined; the worm and gear transmission structure is used for controlling the clamping structure to be opened and closed in a one-way manner; the driving structure is used for driving the worm and gear transmission structure; the clutch structure is used for keeping the worm and gear transmission structure matched with the driving structure; the driving structure is installed in the threading die bush in a sliding mode, slides along with installation of the threading die and resets along with taking-out of the threading die. Wherein the clamping structure is in a limited state, when the driving structure slides, the clutch structure is in a separated state, and the machining device has the advantage that the situation of inclination during machining is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of machining, and in particular to a handheld external thread machining component. Background Art

[0002] The Chinese patent with the authorization announcement number CN210548618U discloses a handheld external thread processing device, including a die quick-change device, a planetary gear transmission device, a power drive device and a housing. The die quick-change device is composed of a die, a die bushing, an ejector, a conical sleeve and a compression spring. The ejector fixes the die in the die bushing through the die bushing. The large end of the ejector contacts the inner wall of the conical sleeve. The conical sleeve covers the die bushing inside, and the outer wall is installed with a compression spring. The planetary gear transmission device is composed of a planetary carrier, a planetary gear, an inner gear ring, a transmission shaft, a bearing and a large bevel gear. The lower end of the planetary carrier is equipped with a large bevel gear. The transmission shaft is positioned by a bearing, and the planetary gear is installed on the planetary carrier arm. The power drive device is composed of a small bevel gear, a positioning sleeve, a coupling, a motor, a control button and a lithium battery. The small bevel gear is fixed inside the housing handle and meshes with the large bevel gear. The motor transmits torque to the small bevel gear. The lithium battery supplies power to the motor. The control button can control the direction and speed of the entire device.

[0003] The handheld external thread processing device in the application realizes external thread processing by electric control and has the advantages of small and simple structure. However, it is found in actual use that when processing external threads, it is impossible to ensure that the force applied is the same when holding both sides. Therefore, it is easy to tilt, resulting in defects in external thread processing, or the force required for processing increases due to the tilt, and even causes the electric structure to get stuck. In this way, it is easy to cause the motor to be overloaded, causing the equipment to be easily damaged. Summary of the invention

[0004] In order to avoid tilting during processing, the present application provides a handheld external thread processing assembly.

[0005] The present application provides a handheld external thread processing assembly, which adopts the following technical solution A handheld external thread processing assembly comprises a housing and a die quick-change structure, wherein the die quick-change structure comprises a die and a die bushing arranged in the housing for mounting the die, and further comprises a clamping structure for positioning a workpiece to be processed, a worm gear transmission structure for unidirectionally controlling the opening and closing of the clamping structure, a driving structure for driving the worm gear transmission structure, and a clutch structure for maintaining the matching between the worm gear transmission structure and the driving structure, wherein the driving structure is slidably mounted in the die bushing, and the driving structure slides as the die is installed and resets as the die is removed; Wherein, when the clamping structure is in a restricted state and the driving structure slides, the clutch structure is in a separated state.

[0006] In one of the embodiments: the clamping structure includes at least three clamping claws radially slidably mounted on the housing.

[0007] In one of the embodiments: the turbine worm gear transmission structure includes a turbine rotatably installed in a housing, a worm meshing with the turbine, and an acceleration gear set for transmitting and connecting the worm and the driving structure, the clamp is slidably installed on the turbine, and the sliding direction of the clamp on the turbine is intersected with the radial direction.

[0008] In one of the embodiments: the driving structure includes a driving bushing slidably installed in the die bushing, a rack for driving connection with the worm gear transmission structure, and a reset member for resetting the driving bushing.

[0009] In one embodiment, the clutch structure includes a sliding rod slidably connected to the driving bushing, and a retaining spring for maintaining the connection between the rack and the worm gear transmission structure, and one end of the sliding rod is connected to the rack.

[0010] In one of the embodiments: the die quick-change structure also includes an ejector pin radially inserted into the die bushing, a tendency elasticity for providing a tendency force to the ejector pin away from the center of the die bushing, a conical sleeve slidably installed outside the die bushing, and a compression spring for providing a tendency force to the conical sleeve toward the opening end of the shell, a guide inclined surface for the ejector pin to bear against is provided in the conical sleeve, and an avoidance groove for avoiding the ejector pin is provided on the drive bushing.

[0011] In one of the embodiments: a snap assembly for controlling synchronous sliding is provided between the drive bushing and the tapered sleeve, the snap assembly includes a snap-fitting piece for snap-connecting with the tapered sleeve, an elastic piece for providing radial trend force to the snap-fitting piece, and a block for controlling the compression of the elastic piece by the snap-fitting piece, and the snap-fitting piece is slidably installed on the drive bushing.

[0012] In one of the embodiments: a sliding groove is provided on the die bushing for the sliding movement of the clamping member. During the sliding movement of the driving bushing, the building block can fall out of the sliding groove, and at this time, the clamping member compresses the elastic member.

[0013] In one embodiment, the driving bushing includes a follower bushing installed in the die bushing, and a connecting bushing rotatably connected to the follower bushing, and the rack and the clutch structure are connected to the connecting bushing.

[0014] In summary, this application has the following beneficial effects: 1. Through the installation of the die, the clamping structure can be automatically controlled to clamp the workpiece to be processed. At the same time, due to the design of the clutch structure, the clamping structure can clamp workpieces of different diameters. 2. Through the setting of the snap-fit ​​assembly, the die can automatically move the ejector pin outward during installation, so that the die can be installed normally. At the same time, during the subsequent sliding process of the drive bushing, the snap-fit ​​part is separated from the tapered sleeve, so that the tapered sleeve is reset and the ejector pin is pushed inward. At this time, when the die is pressed to the installation position, the ejector pin will cooperate with the positioning hole on the outside of the die to complete the fixation of the die. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of this embodiment. Figure 1 , showing the state when the die is not installed; Figure 2 It is a schematic diagram of the local structure of the embodiment Figure 1 , showing the structure of the buckle assembly; Figure 3 This is a schematic diagram of the structure of this embodiment. Figure 2 , showing the state of the die when it is installed; Figure 4 This is a schematic diagram of the local structure of this embodiment. Figure 2 , showing the structure of the clutch structure; Figure 5 is a partial cross-sectional view of this embodiment, showing a schematic structural diagram of a worm gear transmission structure and a clamping structure; Figure 6 Schematic diagram of the structure of the turbine and the clamping structure in this embodiment.

[0016] In the figure, 100, housing; 110, gripping handle; 200, die quick-change structure; 210, die bushing; 211, slideway; 220, die; 230, ejector pin; 240, trend elasticity; 250, tapered sleeve; 251, narrow section; 252, tapered section; 253, flared section; 260, compression spring; 300, clamping structure; 310, clamping claw; 400, worm gear transmission structure; 410, worm Wheel; 411, sliding groove; 420, worm; 430, acceleration gear set; 500, driving structure; 510, driving bushing; 511, follower bushing; 512, connecting bushing; 513, avoidance groove; 520, rack; 530, reset member; 600, clutch structure; 610, sliding rod; 620, retaining spring; 700, buckle assembly; 710, clamping member; 720, elastic member; 730, building block. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with the accompanying drawings.

[0018] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0019] A handheld external thread processing component, such as Figure 1 As shown, it includes a shell 100, and a die quick-change structure 200, a clamping structure 300, a worm gear transmission structure 400, a driving structure 500 and a clutch structure 600 installed in the shell 100, and holding handles 110 are provided on both sides of the shell 100.

[0020] like Figure 1 and Figure 2 As shown, the die quick-change structure 200 includes a die 220, a die bushing 210, a pin 230, a trend elastic 240, a conical sleeve 250 and a compression spring 260. The die bushing 210 is rotatably installed in the housing 100 and can be controlled to rotate by a power drive device in the housing 100.

[0021] The ejector pin 230 is inserted radially on the die bushing 210, one end of the ejector pin 230 can be inserted into the die bushing 210, and the other end of the ejector pin 230 is provided with a spherical abutment portion. The trend elastic 240 is provided outside the die bushing 210, and the two ends of the trend elastic 240 are respectively abutted against the outer wall of the die bushing 210 and the abutment portion, and the trend elastic 240 provides a trend force away from the center direction of the die bushing 210 to the ejector pin 230.

[0022] The conical sleeve 250 and the compression spring 260 are both arranged in the outer shell. The conical sleeve 250 is slidably installed outside the die bushing 210. The compression spring 260 is sleeved outside the die bushing 210. One end of the compression spring 260 is against the outer shell and the other end is against the conical sleeve 250. The compression spring 260 provides a tendency force to the conical sleeve 250 toward the open end of the shell 100.

[0023] The conical sleeve 250 includes a narrow section 251, a conical section 252 and a flared section 253. The narrow section 251 is sleeved on the outside of the die bushing 210, and the flared section 253 is sleeved in the outer shell. The conical section 252 connects the narrow section 251 and the flared section 253. The inner wall of the conical section 252 forms a guiding inclined surface for the upper abutment portion of the ejector pin 230 to abut against.

[0024] Reference Figure 2A buckle assembly 700 for controlling synchronous sliding is provided between the driving bushing 510 and the conical sleeve 250. The buckle assembly 700 includes a clamping member 710 for clamping connection with the conical sleeve 250, an elastic member 720 for providing radial tendency force to the clamping member 710, and a block 730 for controlling the clamping member 710 to compress the elastic member 720. The clamping member 710 is slidably installed on the driving bushing 510. In this embodiment, the elastic member 720 is a flexible elastic sheet with a small thickness. The block 730 is integrally arranged with the clamping member 710, and a downward facing masonry surface is provided on the block 730.

[0025] The die bushing 210 is provided with a slide groove 211 for the clamping member 710 to slide, and the inner wall of the conical sleeve 250 is provided with a slot for the clamping member 710 to be inserted into. One end of the clamping member 710 extends from the slide groove 211 and is clamped with the slot.

[0026] The slot is preferably provided with an annular structure so that no axial positioning is required between the tapered sleeve 250 and the drive bushing 510. Therefore, the drive bushing 510 rotates with the die bushing 210 without affecting the connection between the clamping member 710 and the slot.

[0027] In addition, it should be noted that if Figure 3 As shown, in order to enable the ejector pin 230 to lock the die 220 after the die 220 is installed, the driving bushing 510 will cause the building block 730 to escape from the slide groove 211 during the sliding process, and the clamping member 710 will compress the elastic member 720 at this time, so that the clamping member 710 is separated from the clamping groove, and the conical sleeve 250 moves up and reset under the tendency force of the compression spring 260. When the ejector pin 230 is aligned with the positioning hole on the outer wall of the die 220, the conical sleeve 250 pushes the ejector pin 230 to move radially into the die bushing 210, so that the ejector pin 230 is inserted into the positioning hole to fix the die 220.

[0028] like Figure 3 As shown, the driving structure 500 is used to drive the worm gear transmission structure 400, which includes a driving bushing 510 slidably installed in the die bushing 210, a rack 520 for transmission connection with the worm gear transmission structure 400, and a reset member 530 for resetting the driving bushing 510.

[0029] The driving bushing 510 includes a follower bushing 511 installed in the die bushing 210, and a connecting bushing 512 rotatably connected to the follower bushing 511. The connecting bushing 512 and the follower bushing 511 are connected by a snap-fit ​​so that the two can move axially synchronously. The follower bushing 511 can rotate with the die bushing 210, while the connecting bushing 512 remains fixed and does not rotate therewith.

[0030] Combined with Figure 2The driving bushing 510 is provided with an avoidance groove 513 for avoiding the ejector pin 230 . Specifically, the avoidance groove 513 is provided at the end of the follower bushing 511 , the clamping piece 710 is installed on the follower bushing 511 , and the rack 520 is installed on the connecting bushing 512 .

[0031] like Figure 3 and Figure 4 As shown, the clutch structure 600 is used to maintain the cooperation between the turbine worm gear transmission structure 400 and the driving structure 500, and includes a sliding rod 610 slidingly connected to the driving bushing 510, and a retaining spring 620 for maintaining the connection between the rack 520 and the turbine worm gear transmission structure 400. The sliding rod 610 is installed and arranged for radial sliding along the connecting bushing 512, and one end of the sliding rod 610 is connected to the rack 520. Through the arrangement of the clutch structure 600, the rack 520 can slide slightly in the radial direction while sliding axially with the driving bushing 510. In this way, when the clamping structure 300 is in a restricted state so that the turbine worm gear transmission structure 400 cannot be driven, the rack 520 will compress the retaining spring 620 to move radially so that the clutch structure 600 is in a separated state. In this way, the axial movement of the driving bushing 510 and the rack 520 can be affected without driving the turbine worm gear transmission structure 400.

[0032] like Figure 4 and Figure 5 As shown, the clamping structure 300 is used to position a workpiece to be processed, and includes at least three clamping jaws 310 radially slidably mounted on the housing 100 .

[0033] The worm gear transmission structure 400 is used for unidirectionally controlling the opening and closing of the clamping structure 300. The worm gear transmission structure 400 includes a worm gear 410 rotatably installed in the housing 100, a worm gear 420 meshing with the worm gear 410, and an acceleration gear set 430 for transmitting and connecting the worm gear 420 and the driving structure 500. The worm gear 410 is coaxially arranged with the die bushing 210, and the input end of the acceleration gear set 430 is meshed with the rack 520, and the output end is connected to the worm gear 420.

[0034] The clamp 310 is slidably installed on the turbine 410, and the sliding direction of the clamp 310 on the turbine 410 is arranged to intersect with the radial direction. Specifically, in this embodiment, a cylindrical slider is arranged on the clamp 310, and the slider is arranged along the axial direction of the turbine 410. A sliding groove 411 is arranged on the turbine 410 to realize a sliding connection between the two.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A handheld external thread processing assembly, comprising a housing (100) and a die quick-change structure (200), wherein the die quick-change structure (200) comprises a die (220) and a die bushing (210) disposed in the housing (100) for mounting the die (220), wherein: It also includes a clamping structure (300) for positioning a workpiece to be processed, a worm gear transmission structure (400) for unidirectionally controlling the opening and closing of the clamping structure (300), a driving structure (500) for driving the worm gear transmission structure (400), and a clutch structure (600) for maintaining the cooperation between the worm gear transmission structure (400) and the driving structure (500), wherein the driving structure (500) is slidably installed in a die bushing (210), and the driving structure (500) slides as the die (220) is installed and resets as the die (220) is removed; Wherein, when the clamping structure (300) is in a restricted state and the driving structure (500) slides, the clutch structure (600) is in a separated state.

2. The handheld external thread processing assembly according to claim 1 is characterized in that: The clamping structure (300) comprises at least three clamping claws (310) which are radially slidably mounted on the housing (100).

3. The handheld external thread machining assembly according to claim 2 is characterized in that: The turbine worm gear transmission structure (400) comprises a turbine (410) rotatably mounted in a housing (100), a worm (420) meshing with the turbine (410), and an acceleration gear set (430) for transmission connection between the worm (420) and a driving structure (500); the clamp (310) is slidably mounted on the turbine (410), and the sliding direction of the clamp (310) on the turbine (410) is arranged to intersect with a radial direction.

4. The handheld external thread machining assembly according to claim 1 or 3, characterized in that: The driving structure (500) comprises a driving bushing (510) slidably mounted in a die bushing (210), a rack (520) for driving connection with a worm gear transmission structure (400), and a reset member (530) for resetting the driving bushing (510).

5. The handheld external thread machining assembly according to claim 4 is characterized in that: The clutch structure (600) comprises a sliding rod (610) slidingly connected to a driving bushing (510), and a retaining spring (620) for maintaining the connection between a rack (520) and a worm gear transmission structure (400), wherein one end of the sliding rod (610) is connected to the rack (520).

6. The handheld external thread machining assembly according to claim 4, characterized in that: The die quick-change structure (200) further comprises an ejector pin (230) radially inserted into the die bushing (210), a tendency elasticity (240) for providing a tendency force to the ejector pin (230) in a direction away from the center of the die bushing (210), a conical sleeve (250) slidably mounted outside the die bushing (210), and a compression spring (260) for providing a tendency force to the conical sleeve (250) in a direction toward the opening end of the housing (100), wherein the conical sleeve (250) is provided with a guide inclined surface for the ejector pin (230) to abut against, and the drive bushing (510) is provided with an avoidance groove (513) for avoiding the ejector pin (230).

7. The handheld external thread machining assembly according to claim 6, characterized in that: A snap assembly (700) for controlling synchronous sliding is provided between the driving bushing (510) and the conical sleeve (250). The snap assembly (700) comprises a snap-fitting member (710) for snap-fitting connection with the conical sleeve (250), an elastic member (720) for providing a radial tendency force to the snap-fitting member (710), and a block (730) for controlling the snap-fitting member (710) to compress the elastic member (720). The snap-fitting member (710) is slidably mounted on the driving bushing (510).

8. The handheld external thread machining assembly according to claim 7, characterized in that: The die bushing (210) is provided with a slide groove (211) for the clamping member (710) to slide. During the sliding process of the driving bushing (510), the building block (730) can be released from the slide groove (211), and at this time, the clamping member (710) compresses the elastic member (720).

9. The handheld external thread machining assembly according to claim 8, characterized in that: The driving bushing (510) comprises a follower bushing (511) installed in a die bushing (210), and a connecting bushing (512) rotatably connected to the follower bushing (511), and the rack (520) and the clutch structure (600) are connected to the connecting bushing (512).

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