Injection molding part welding clamp

Abstract

The utility model discloses a welding fixture for an injection molded part. The welding fixture comprises a base, a turntable and a fixture body, a speed reducer is fixedly mounted in the center of the top of the base, an input shaft of the speed reducer is in transmission connection with an output shaft of a stepping motor, and the stepping motor is fixedly mounted above the base; an output shaft of the speed reducer is fixedly mounted at the center of the bottom of the turntable; the stepping motor drives the turntable to rotate through the speed reducer; the three sets of clamp bodies are arranged on the top of the rotating disc in a circular array mode, each clamp body comprises a fixed clamp and a movable clamp, the fixed clamps are fixedly installed on the rotating disc, and the movable clamps are located on the outer sides of the fixed clamps; according to the automatic feeding device, workpieces can be circularly conveyed to the position below a welding head of the ultrasonic welding machine through a set of stepping motors, meanwhile, power for rotating the rotary table can be converted into power for controlling opening and closing of the clamp bodies through the meshing driving mechanism, and therefore clamping feeding of the workpieces and loosening of the clamps are achieved, and discharging is convenient.

Description

Technical Field

[0001] The utility model relates to the field of X, in particular to a welding fixture for injection molded parts. Background Art

[0002] Plastic welding refers to a method of connecting two plastic parts by heating them to melt their contact surfaces at the same time, thereby combining them into a whole. Among them, ultrasonic welding machines are designed to perform high-speed rotation and pressurization movements on round or tubular workpieces such as PE, PP, nylon, PET, etc., which are difficult to weld by heat or ultrasonic welding, so that the upper and lower workpieces can be melted and combined in a very short time. This principle makes the bonding force after processing extremely high watertight and airtight.

[0003] For example, the patent with the authorization announcement number CN219131107U discloses an ultrasonic welding fixture with a transposition device, including a base, and also including: a rotating disk rotatably connected to the base, a fixed clamping block fixedly connected to the rotating disk, three groups of threaded rods circumferentially distributed on the fixed clamping block, each group of the threaded rods has two, and the threaded rods are rotatably connected to the fixed clamping block; three sliding clamping blocks threadedly connected to the threaded rods;

[0004] The above patent provides three groups of sliding clamps and threaded rods distributed circumferentially on the rotating disk, which facilitates fast and effective assembly line welding of weldments during batch welding, improves the welding efficiency during the use of existing ultrasonic welding fixtures, and eliminates the need for workers to put their hands under the ultrasonic welding machine during welding, eliminating safety hazards during welding; however, each fixture in the above patent requires a separate rotating knob to achieve the fixation and support of the weldment, and the work efficiency is too low.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide an injection molding welding fixture for an ultrasonic welding machine which is convenient for batch clamping, so as to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The injection molding welding fixture comprises a base, a turntable and a clamping body; a reducer is fixedly installed at the top center of the base, and the input shaft of the reducer is transmission-connected with the output shaft of the stepper motor, wherein the stepper motor is fixedly installed above the base; the output shaft of the reducer is fixedly installed at the bottom center of the turntable, and the stepper motor drives the turntable to rotate through the reducer; the clamping body is provided with three groups and the clamping bodies are arranged in a circular array on the top of the turntable, the clamping body comprises a fixed clamp and a movable clamp, wherein the fixed clamp is fixedly installed on the turntable, and the movable clamp is located on the outside of the fixed clamp; at the same time, a slide groove is provided on the turntable below the movable clamp, and a slider is slidably arranged in the slide groove, and a movable clamp is fixedly installed on the top of the slider; the clamping body also comprises a group of trapezoidal screw mechanisms for driving the movable clamp to move; the trapezoidal screw mechanisms include mutually coordinated arrangements The invention relates to a trapezoidal lead screw and a lead screw nut, wherein both ends of the trapezoidal lead screw are rotatably mounted on the bottom of the turntable through bearings and bearing seats, wherein a nut seat is integrally formed at the bottom of the slider, wherein a mounting hole for mounting the lead screw nut is opened on the nut seat, and the lead screw nut is fixedly mounted in the mounting hole; it also includes a group of meshing drive mechanisms for the action of the trapezoidal lead screw, the meshing drive mechanism includes a forward rack, a reverse rack and a driven gear, and the driven gear can mesh with each other when contacting the forward rack and the reverse rack; wherein the forward rack and the reverse rack are fixedly arranged in front of the top of the base, and the teeth of the forward rack are arranged upward, and the teeth of the reverse rack are arranged downward; and the forward rack and the reverse rack are respectively located at the upper and lower positions of the driven gear in the vertical direction; the end of the trapezoidal lead screw facing outward passes through the corresponding bearing seat and is fixedly mounted with the driven gear.

[0009] Furthermore, the base is provided with a plurality of sets of edge support structures in a circular array, and the edge support structures include a first shaft seat and a deep groove ball bearing; a first support shaft is fixedly installed on the top of the first shaft seat, and the first support shaft is horizontally arranged, and a supporting deep groove ball bearing is rotatably connected to the first support shaft, and the outer ring of the supporting deep groove ball bearing abuts the bottom of the turntable.

[0010] Furthermore, an annular abutment groove is provided at the bottom of the turntable, and the outer ring of the supporting deep groove ball bearing is adapted to the abutment groove, and the outer ring portion of the outer ring of the supporting deep groove ball bearing is located in the abutment groove.

[0011] Furthermore, a clamping groove for clamping a workpiece is provided on one side of the fixed clamp close to the movable clamp, and a clamping block adapted to the clamping groove is provided on one side of the movable clamp close to the fixed clamp, wherein part of the clamping block is located in the clamping groove.

[0012] Furthermore, the slide groove is generally in the form of a rectangular groove body with openings at the top and bottom, and the sliding block is generally in the form of an I-beam.

[0013] Furthermore, the forward-rotating rack is fixedly mounted on the left side of the top front of the base through a first rack mounting seat.

[0014] Furthermore, the inverted rack is fixedly mounted on the top front right side of the base through a second rack mounting seat.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model has only one set of power mechanism (reducer and stepper motor), and through this set of stepper motor, not only can the workpiece be cyclically sent to the bottom of the welding head of the ultrasonic welding machine, but also the power of the rotation of the turntable can be converted into power for controlling the opening and closing of the clamp through the meshing drive mechanism, so as to realize the clamping and loading of the workpiece and the loosening of the clamp for unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the injection molding welding fixture.

[0018] Figure 2 This is the front view of the welding fixture for injection molded parts.

[0019] Figure 3 This is a top view of the welding fixture for injection molded parts.

[0020] Figure 4 This is a half-section view of the injection molding welding fixture.

[0021] Figure 5 This is a schematic diagram of the structure of the base in the injection molding welding fixture.

[0022] Figure 6 This is a schematic diagram of the bottom structure of the turntable in the injection molding welding fixture. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0024] Generally speaking, the welding head of an ordinary ultrasonic welding machine cannot move in the horizontal direction, but can only move up and down. When it is started, it moves downward to contact the workpiece, causing high-frequency vibration on the surface of the workpiece, which in turn causes friction heat on the surface of the workpiece, thereby melting the surface material and pressing the workpieces together.

[0025] See also Figure 1-6 , an injection molding welding fixture, comprising a base 1, a turntable 2 and a clamp body 4;

[0026] A reducer 101 is fixedly installed at the top center of the base 1, and the input shaft of the reducer 101 is drivingly connected to the output shaft of the stepper motor 102, wherein the stepper motor 102 is fixedly installed above the base 1; the output shaft of the reducer 101 is fixedly installed at the bottom center of the turntable 2, and the stepper motor 102 drives the turntable 2 to rotate through the reducer 101;

[0027] At the same time, in order to support the edge of the turntable 2, the base 1 is also provided with a plurality of edge support structures 3 in a circular array.

[0028] The edge support structure 3 includes a first shaft seat 301 and a deep groove ball bearing 303; a first support shaft 302 is fixedly installed on the top of the first shaft seat 301, and the first support shaft 302 is horizontally arranged, and a supporting deep groove ball bearing 303 is rotatably connected to the first support shaft 302, and the outer ring of the supporting deep groove ball bearing 303 abuts the bottom of the turntable 2;

[0029] In this solution, an annular abutment groove 304 is further provided at the bottom of the turntable 2, and the outer ring of the supporting deep groove ball bearing 303 is adapted to the abutment groove 304, and the outer ring portion of the outer ring of the supporting deep groove ball bearing 303 is located in the abutment groove 304;

[0030] The clamp bodies 4 are provided in three groups and are arranged in a circular array on the top of the turntable 2. The clamp bodies 4 include a fixed clamp 401 and a movable clamp 402, wherein the fixed clamp 401 is fixedly installed on the turntable 2, and the movable clamp 402 is located outside the fixed clamp 401;

[0031] Specifically, a clamping groove 403 for clamping a workpiece is provided on one side of the fixed fixture 401 close to the movable fixture 402, and a clamping block 404 adapted to the clamping groove 403 is provided on one side of the movable fixture 402 close to the fixed fixture 401, wherein a portion of the clamping block 404 is located in the clamping groove 403. When the movable fixture 402 moves away from the fixed fixture 401, the space between the clamping groove 403 and the clamping block 404 becomes larger, but at this time the clamping block 404 will not completely escape from the clamping groove 403. When the movable fixture 402 approaches the fixed fixture 401, the space between the clamping groove 403 and the clamping block 404 decreases, and at this time the clamping block 404 and the clamping groove clamp the workpiece.

[0032] At the same time, a slide groove 405 is provided on the turntable 2 below the movable fixture 402, a slider 406 is slidably provided in the slide groove 403, and the movable fixture 402 is fixedly installed on the top of the slider 406;

[0033] The slide groove 405 is generally in the form of a rectangular groove with openings at the top and bottom, and the slider 406 is generally in the form of an I-beam.

[0034] The clamp body 4 also includes a set of trapezoidal screw mechanisms 407 for driving the movable clamp 402 to move. The advantage of using the trapezoidal screw mechanism 407 in this solution is that the trapezoidal screw can be self-locking. The self-locking principle of the trapezoidal screw is to use the characteristic that the reverse movement of the spiral pair cannot be transmitted. When the trapezoidal screw is subjected to an external force, due to the action of its own weight and friction, the spiral pair cannot rotate in the reverse direction, thereby achieving self-locking.

[0035] After the self-locking trapezoidal screw mechanism 407 pushes the movable clamp 402 to clamp the workpiece, the movable clamp 402 will not be released;

[0036] The trapezoidal screw mechanism 407 includes a trapezoidal screw 408 and a screw nut 409 which are arranged in cooperation with each other. The two ends of the trapezoidal screw 408 are rotatably mounted on the bottom of the turntable 2 through bearings and bearing seats 410 respectively, wherein a nut seat 411 is integrally formed at the bottom of the slider 406, wherein the nut seat 411 is provided with a mounting hole for mounting the screw nut 409, and the screw nut 409 is fixedly mounted in the mounting hole;

[0037] When the trapezoidal lead screw 408 rotates, it can drive the slider 406 to move forward and backward along the slide slot through the lead screw nut, thereby driving the movable clamp 402 to move;

[0038] In this embodiment, a meshing drive mechanism 5 for the action of the trapezoidal screw 408 is also included. The meshing drive mechanism 5 includes a forward-rotating rack 501, a reverse-rotating rack 502, and a driven gear 503. The driven gear 503 can mesh with the forward-rotating rack 501 and the reverse-rotating rack 502 when in contact.

[0039] The forward rack 501 and the reverse rack 502 are fixedly arranged at the top front of the base 1, and the teeth of the forward rack 501 are arranged upward, while the teeth of the reverse rack 502 are arranged downward; and the forward rack 501 and the reverse rack 502 are respectively located above and below the driven gear 503 in the vertical direction; the end of the trapezoidal lead screw 408 facing outward passes through the corresponding bearing seat 410 and is fixedly installed with the driven gear 503;

[0040] Specifically, the forward-rotating rack 501 is fixedly mounted on the top front left side of the base 1 through a first rack mounting seat 504;

[0041] Specifically, the reverse rack 502 is fixedly mounted on the top front right side of the base 1 through the second rack mounting seat 505;

[0042] When the utility model is put into use,

[0043] Step 1. In the initial state, a set of clamp bodies 4 is facing forward. At this time, the set of clamp bodies 4 is in a loose state. The workpiece is placed in the clamping groove 403, and then the turntable 2 rotates forward. As the turntable rotates, the driven gear under the turntable 2 contacts the forward rack 501. At this time, the forward rack forces the driven gear to rotate forward. The forward rotation of the driven gear drives the trapezoidal screw 408 to rotate, and then drives the movable clamp 402 to approach the fixed clamp 401, thereby clamping the workpiece;

[0044] Step 2. As the turntable 2 continues to rotate, the second group of clamping bodies 4 will approach the reversing rack 502. Since the reversing rack 502 is located on the driven gear, the reversing rack 502 will force the driven gear to rotate in the opposite direction, so that the movable clamp 402 of this group will move away from the fixed clamp 401, thereby loosening the workpiece. At this time, the worker can take the workpiece out of the clamping body 4 and then replace it with the next workpiece; then repeat steps 1-2 as the turntable 2 continues to rotate, and the cyclic loading and unloading of the workpiece can be realized.

[0045] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

Claims

1. An injection molding welding fixture, comprising a base, a turntable and a clamp body; characterized in that: A reducer is fixedly installed at the top center of the base, and the input shaft of the reducer is transmission-connected with the output shaft of the stepper motor, wherein the stepper motor is fixedly installed above the base; the output shaft of the reducer is fixedly installed at the bottom center of the turntable, and the stepper motor drives the turntable to rotate through the reducer; the clamping bodies are arranged in three groups and the clamping bodies are arranged in a circular array on the top of the turntable, and the clamping bodies include a fixed clamp and a movable clamp, wherein the fixed clamp is fixedly installed on the turntable, and the movable clamp is located on the outside of the fixed clamp; at the same time, a slide groove is provided on the turntable below the movable clamp, and a slider is slidably arranged in the slide groove, and a movable clamp is fixedly installed on the top of the slider; the clamping body also includes a set of trapezoidal screw mechanisms for driving the movable clamp to move; the trapezoidal screw mechanism includes a trapezoidal screw and a screw nut that are arranged in cooperation with each other The two ends of the trapezoidal lead screw are rotatably mounted on the bottom of the turntable through bearings and bearing seats, respectively, wherein a nut seat is integrally formed at the bottom of the slider, wherein a mounting hole for mounting a lead screw nut is opened on the nut seat, and the lead screw nut is fixedly mounted in the mounting hole; it also includes a group of meshing drive mechanisms for the action of the trapezoidal lead screw, the meshing drive mechanism includes a forward rack, a reverse rack and a driven gear, and the driven gear can mesh with each other when contacting the forward rack and the reverse rack; wherein the forward rack and the reverse rack are fixedly arranged in front of the top of the base, and the teeth of the forward rack are arranged upward, and the teeth of the reverse rack are arranged downward; and the forward rack and the reverse rack are respectively located at the upper and lower positions of the driven gear in the vertical direction; the end of the trapezoidal lead screw facing outward passes through the corresponding bearing seat and is fixedly mounted with a driven gear.

2. The injection molding welding fixture according to claim 1, characterized in that: The base is also provided with multiple sets of edge support structures in a circular array, and the edge support structures include a first shaft seat and a deep groove ball bearing; a first support shaft is fixedly installed on the top of the first shaft seat, and the first support shaft is horizontally arranged, and a supporting deep groove ball bearing is rotatably connected to the first support shaft, and the outer ring of the supporting deep groove ball bearing abuts the bottom of the turntable.

3. The injection molded parts welding fixture according to claim 2, characterized in that: The bottom of the rotating disk is also provided with an annular abutment groove, the outer ring of the supporting deep groove ball bearing is adapted to the abutment groove, and the outer ring portion of the outer ring of the supporting deep groove ball bearing is located in the abutment groove.

4. The injection molded parts welding fixture according to claim 1, characterized in that: A clamping groove for clamping a workpiece is provided on one side of the fixed clamp close to the movable clamp, and a clamping block adapted to the clamping groove is provided on one side of the movable clamp close to the fixed clamp, wherein part of the clamping block is located in the clamping groove.

5. The injection molded parts welding fixture according to claim 1, characterized in that: The slide groove is in the form of a rectangular groove with openings at the top and bottom, and the slider is in the form of an I-beam.

6. The injection molded parts welding fixture according to claim 1, characterized in that: The forward-rotating rack is fixedly mounted on the left side of the top front of the base through a first rack mounting seat.

7. The injection molded parts welding fixture according to claim 1, characterized in that: The reverse rack is fixedly mounted on the top front right side of the base through a second rack mounting seat.

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