WO2025086966A1 - Electric crimping tool - Google Patents

Abstract

An electric crimping tool, comprising: a housing; a motor, accommodated in the housing and providing power to a transmission mechanism; a fixed plate, fixedly disposed in the housing as a support member; a pair of jaws, the middle portions of which are respectively hingedly mounted on the fixed plate, outer sections of the two jaws forming a jaw opening for squeezing a workpiece, and inner sections thereof respectively having a follower mounted thereon; and further comprising an electric loading member and a manual loading member arranged in parallel and independent of each other. The transmission mechanism converts rotation of the motor into linear motion of the electric loading member by means of a helical pair. Motion of a trigger hingedly mounted on the fixed plate is converted into linear motion of the manual loading member by means of an operation rod. According to the tool, the jaws are sequentially manually and electrically driven to be closed, and the manual loading member and electric loading member are separated from each other, so that squeezing of the workpiece by electrically applying a force after rapid manual holding of the workpiece is implemented, the whole operation time is shortened, and the efficiency of operation is improved.

Description

Electric crimping tool Technical Field

The invention relates to an electric crimping tool, in particular to a handheld electric crimping pliers, belonging to the technical field of tools.

Background Art

An electric crimping tool is a tool commonly used in pipeline, electricity and other construction operations to drive a working head to operate through a transmission mechanism. Its typical structure is disclosed in the Chinese patent application number 201380042456.8, which includes a housing, a transmission device driven by a motor and accommodated in the housing, and is used to drive the crimping head to operate. The transmission device includes a loader that is driven by a motor by applying a hand force, and the loader acts on the extrusion jaws. In this technical solution, the loader acting on the extrusion jaws first closes the jaws under the action of a gripping force, and then loads the jaws through a traveling member under the drive of a motor to clamp them. However, the loader is first actuated by a gripping force and then driven by a motor, which essentially "connects" the manual operation and the electric operation in series on the same loader to achieve the closing and clamping of the jaws. Since the manual operation causes the loading part to move down a certain distance, the subsequent motor drive must first move the travel part down the manual distance before it can act on the loading part to generate a force on the jaws. This "manual down distance" is actually the "no-load stroke" after the motor is started, which affects the work efficiency. In addition, the technical solution of the patent application uses electric and manual actions on an integrated loading part, and it is impossible to adjust the electric and manual actions separately according to actual needs.

Summary of the invention

The purpose of the present invention is to address the shortcomings of the above-mentioned prior art and to propose an electric crimping tool that can not only realize the switching between manual and electric crimping, but also the motor directly drives the loader when switching, thereby reducing the motor's no-load stroke, thereby completing the crimping work more quickly and improving work efficiency.

In order to achieve the above purpose, the basic technical scheme of the electric crimping tool of the present invention is as follows: it includes a housing; a motor, which is contained in the housing and provides power to the transmission mechanism; a fixed plate, which is fixedly arranged in the housing as a support; a pair of pliers, each of which is hinged to the fixed plate in the middle, the outer section constitutes a jaw for extruding a workpiece, and the inner section is respectively equipped with a follower; an electric loader and a manual loader which are arranged in parallel and are independent of each other; the transmission mechanism converts the rotation of the motor into the linear motion of the electric loader through a spiral pair; the trigger hinged on the fixed plate converts the trigger motion into the linear motion of the manual loader through an operating rod; the manual loader has first driving surfaces on both sides that form a cam pair with the corresponding follower; the electric loader has second driving surfaces on both sides that form a cam pair with the corresponding follower; when the trigger is operated to drive the manual loader to shift linearly and the pliers are driven to close from the starting position to the first pre-tightening position through the first driving surface, the motor is triggered to start, drive the electric loader to shift linearly and drive the pliers from the first pre-tightening position to the clamping position through the second driving surface.

Since the closure of the jaws of the present invention is not only driven manually and electrically in sequence, thereby realizing manual quick clamping followed by electric force tightening, but also since the manual loading and electric loading are separately arranged and partially overlapped in projection, the loader is directly driven electrically, reducing the "idle stroke" of the manual loader movement that must be eliminated when switching from manual to electric in the prior art, thereby shortening the entire operation time and improving operation efficiency.

A further improvement of the present invention is that the linear displacement distance of the second driving surface from its initial position to the electric loading original position is smaller than the linear displacement distance of the first driving surface to close the jaws from the initial position to the first pre-tightening position.

A further improvement of the present invention is that the upper surface of the electric loading component is arranged lower than the upper surface of the manual loading component.

A further improvement of the present invention is that the angle formed by the first driving surface is greater than the angle formed by the second driving surface.

A further improvement of the present invention is that the angle formed by the first driving surface is preferably 30° to 60°, and the angle formed by the second driving surface is preferably 25° to 55°.

A further improvement of the present invention is that: the fixed plate includes an upper fixed plate and a lower fixed plate, the manual loader has a manual guide platform, and the manual guide platform passes through the guide groove of the upper fixed plate; the electric loader has an electric guide platform, and the electric guide platform passes through the guide groove of the lower fixed plate.

A further improvement of the present invention is that the trigger has a toothed portion meshing with the toothed portion of the operating rod.

A further improvement of the present invention is that the trigger has a support pin rotatably connected to the waist-shaped groove of the fixing plate.

A further improvement of the present invention is that the electric crimping tool also includes a start switch, a start-stop switch and an off switch; when the trigger closes the start switch, the motor rotates forward; when the trigger opens the start switch, the motor reverses; the electric loader moves to the predetermined squeezing position to trigger the start-stop switch; and when the electric loader moves to the initial position to trigger the off switch.

A further improvement of the present invention is that the electric crimping tool further includes an emergency switch, and the operating rod triggers the emergency switch, causing the motor to reverse.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below with reference to the accompanying drawings.

FIG. 1 is a three-dimensional schematic diagram of an electric crimping tool according to a first embodiment of the present invention.

FIG. 2 is a front view of the transmission component of the embodiment of FIG. 1 at the initial position of the crimping operation.

FIG. 3 is a rear view of the transmission component of the embodiment of FIG. 1 at the initial position of the crimping operation.

FIG. 4 is a front view of the transmission component of the embodiment of FIG. 1 when the manual operation is completed.

FIG. 5 is a rear view of the transmission component of the embodiment of FIG. 1 when the manual operation is completed.

FIG. 6 is a front view of the transmission component of the embodiment of FIG. 1 when the electric operation is triggered.

7 is a rear view of the transmission component of the embodiment of FIG. 1 when the electric operation is loaded into the original position.

FIG. 8 is a rear view of the transmission component of the embodiment of FIG. 1 when the electric operation is completed.

9 is a rear view of the transmission component of the embodiment of FIG. 1 when the electric release begins.

DETAILED DESCRIPTION Embodiment 1

The overall structure of the electric crimping tool of this embodiment is shown in FIG1 , and mainly includes a housing 10, a transmission component contained in the housing 10, the transmission component includes a motor 110, a transmission mechanism 120 driven by the motor 110, two jaws 30, 40 acting on and squeezing the workpiece, a loading mechanism for driving the jaws 30, 40 to rotate and work, and a fixing plate 50 for supporting the jaws 30, 40 and the loading mechanism. The loading mechanism includes a manual loading part 70 and an electric loading part 80, the manual loading part is acted on by a trigger 20, and the electric loading part 80 is acted on by the transmission mechanism 120 driven by the motor 110.

The fixing plate 50 includes an upper fixing plate and a lower fixing plate, and the two pliers 30 and 40 are rotatably supported between the upper and lower fixing plates 50 through rotating shafts 31 and 41, respectively. The outer ends of the pliers 30 and 40 have jaws for squeezing the workpiece, and the inner ends are respectively provided with followers 32 and 42. The followers 32 and 42 are preferably rollers, but can also be cams. The rollers 32 and 42 are respectively installed on the pliers 30 and 40 through shafts 33 and 43, and can rotate around the shafts 33 and 43.

The trigger 20 includes a support pin 22 rotatably connected to the fixing plate 50 , and a tooth portion 21 meshing with the tooth portion 91 of the operating rod 90 . The side surface of the tooth portion 21 can trigger the start switch 101 .

The manual loader 70 has a manual guide platform 71 and a manual driving surface 72 abutting against the followers 32 and 42, and the manual guide platform 71 passes through the guide groove 51 of the upper fixed plate 50. The operating rod 90 converts the movement of the trigger 20 into a linear movement of the manual loader 70 along the guide groove 51 of the upper fixed plate 50. The pressing surface 92 of the operating rod 90 acts on the upper end surface of the manual guide platform 71 of the manual loader 70. When the manual loader 70 moves downward, the manual driving surfaces 72 on both sides of the manual loader 70 act on the followers 32 and 42 to form a cam pair, so that the jaws 30 and 40 rotate around the axes 31 and 41 to achieve a pre-tightening operation.

The electric loader 80 is arranged in parallel and independently of the manual loader 70. The electric loader 80 has an electric guide platform 81 and an electric drive surface 82 abutting against the followers 32 and 42. The electric guide platform 81 passes through the guide groove 51 of the lower fixed plate 50. The transmission mechanism 120 converts the rotation of the motor 110 through the screw 121 to make the electric loader 80 move linearly along the guide groove 51 of the lower fixed plate 50. When the electric loader 80 moves downward, the electric drive surface 82 acts on the followers 32 and 42 to form a cam pair, so that the jaws 30 and 40 rotate around the shafts 31 and 41 to achieve the clamping operation.

As shown in Fig. 2 and Fig. 3, the manual loading component 70 and the electric loading component 80 are located at the initial position, and the jaws 30 and 40 are located at the starting position. The user manually presses the trigger 20 to rotate around the rotating pin 22 to the manual operation completion position shown in Fig. 4 and Fig. 5, and the tooth portion 21 of the trigger 20 drives the tooth portion 91 of the operating rod 90 to rotate the operating rod 90 around the rotating pin 93, and the pressing surface 92 of the operating rod 90 presses down the manual loading component 70, so that the manual loading component 70 moves linearly along the guide groove 51 to the manual loading position shown in Fig. 4, and the manual driving surface 72 acts on the rollers 32 and 42, so that the jaws 30 and 40 rotate around the shafts 31 and 41 from their starting position to the extrusion pre-tightening position. The double-dotted line in Fig. 4 shows the manual loading component 70 at the initial position, and the manual loading component 70 moves from its initial position to the manual loading completion position, and moves downward by a distance L1. The larger the angle α formed by the manual drive surfaces 72 on both sides is, the faster the closing speed of the pliers mouth when rotating to the extrusion pre-tightening position is. The angle α is preferably 30° to 60°.

The user continues to press the trigger 20 to move along the waist groove 52 of the fixing plate 50 to the electric operation trigger position shown in FIG6 , and the side of the tooth portion 21 closes the start switch 101, thereby starting the motor 110 to rotate forward, and the motor 110 drives the screw 121 of the transmission mechanism 120 to rotate, and the screw 121 drives the electric loader 80 to move linearly from its initial position along the guide groove 51 to the electric loading original position of FIG7 , at which time the electric drive surface 82 contacts the rollers 32 and 42; the screw 121 continues to drive the electric loader 80 to move linearly along the guide groove 51 to the electric loading completion position shown in FIG8 , and when the electric loader 80 continues to move downward, the electric drive surface 82 acts on the rollers 32 and 42, so that the jaws 30 and 40 continue to rotate around the shafts 31 and 41 from their extrusion pre-tightening position to the pressing position. At this time, the lower surface of the electric guide platform 81 of the electric loader 80 triggers the start-stop switch 102, thereby shutting down the motor 110. The double-dotted line in FIG7 shows the electric loader 80 at the initial position. The electric loader 80 moves from its initial position to the electric loading original position, and moves downward by a distance L2. The smaller the angle β formed by the electric driving surfaces 82 on both sides of the electric loader 80, the greater the clamping force of the pliers mouth, and the better the crimping effect. The angle β is preferably 25° to 55°.

As shown in FIG3 , since the manual loader 70 and the electric loader 80 are separated from each other and partially overlapped in projection, the electric loader 80 moves from the initial position shown in FIG3 to the electric loading original position shown in FIG7 , which is not associated with the pre-pressing movement distance of the manual loader 70, and the linear displacement L2 of the second driving surface 82 from its initial position to the electric loading original position is less than the linear displacement distance L1 of the first driving surface 72 that closes the jaws 30 and 40 from their starting position to the first pre-tightening position, thereby reducing the distance of the no-load stroke during electric loading. Preferably, the upper surface of the electric loader 80 is set lower than the upper surface of the manual loader 70.

As shown in FIG9 , the user releases the trigger 20 to turn on the start switch 101, thereby starting the motor 110 to reverse, and the motor 110 drives the screw 121 of the transmission mechanism 120 to rotate, and the screw 121 drives the electric loader 80 to move linearly in the opposite direction along the guide slot 51 to the initial position of FIG3 , at which time the upper surface of the electric guide platform 81 of the electric loader 80 triggers the stop switch 103, thereby stopping the motor 110. The trigger 20 moves to the initial position under the bias of the reset spring 131, and the toothed portion 21 of the trigger 20 drives the toothed portion 91 of the operating rod 90 to make the operating rod 90 rotate in the opposite direction around the rotating pin 93, and the manual loader 70 moves linearly along the guide slot 51 to the initial position of FIG2 under the bias of the spring (not shown), and the jaws 30 and 40 rotate around the shafts 31 and 41 to the starting position of FIG2 under the bias of the reset member.

In this embodiment, the electric crimping tool also includes an emergency switch 104. When the electric loader 80 moves linearly downward under the drive of the screw 121, and the operating rod 90 moves in the opposite direction to the initial position during emergency operation, the operating rod 90 triggers the emergency switch 104 to reverse the motor, and the screw 121 of the transmission mechanism 120 of the motor 110 rotates. The screw 121 drives the electric loader 80 to move linearly in the opposite direction along the guide groove 51 to the electric initial position of Figure 3. At this time, the upper surface of the electric guide platform 81 of the electric loader 80 triggers the stop switch 103, thereby shutting down the motor 110.

Practice shows that compared with the prior art, the electric crimping structure of this embodiment adopts the separate arrangement of the manual loader and the electric loader, which has the following significant advantages:

1. The electric loader and the manual loader are arranged in parallel and overlapped. The downward moving position of the electric loader is not related to the downward moving position of the manual loader. The straight-line displacement distance of the second driving surface from its initial position to the original position of the electric loading is smaller than the straight-line displacement distance of the first driving surface that closes the jaws from their starting position to the first pre-tightening position. This reduces the distance of the no-load stroke during electric loading to make the crimping efficiency higher.

2. The driving surfaces of the manual loader and the electric loader are set at different angles according to the needs. The larger the angle α formed by the manual driving surfaces 72 on both sides, the faster the user can turn the pliers mouth to the pre-tightening position, thereby improving the crimping efficiency. The angle α is preferably in the range of 30° to 60°; the smaller the angle β formed by the electric driving surfaces 82 on both sides of the electric loader 80, the greater the clamping force of the pliers mouth and the better the crimping effect. The angle β is preferably 25° to 55°.

In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims (10)

An electric crimping tool comprising: Housing (10); A motor (110) is contained in the housing (10) and provides power to the transmission mechanism (120); A fixing plate (50) fixedly disposed in the housing (10) as a supporting member; A pair of pliers (30, 40), the middle portions of which are hinged to the fixed plate (50), the outer sections of which constitute the pliers for squeezing the workpiece, and the inner sections of which are respectively provided with driven members (32, 42); The invention is characterized in that: An electric loading part (80) and a manual loading part (70) arranged in parallel and independent of each other; The transmission mechanism (120) converts the rotation of the motor (110) into linear motion of the electric loading component (80) via a screw pair; A trigger (20) hingedly mounted on the fixing plate (50) converts the trigger movement into a linear movement of the manual loading component (70) via an operating rod (90); The manual loader (70) has first drive surfaces (72) on both sides respectively, which form a cam pair with the corresponding followers (32, 42); the electric loader (80) has second drive surfaces (82) on both sides respectively, which form a cam pair with the corresponding followers (32, 42); when the trigger (20) is operated to drive the manual loader (70) to shift linearly, and the jaws (30, 40) are driven to close from the starting position to the first pre-tightened position through the first drive surface (72), the motor (110) is triggered to start, drive the electric loader (80) to shift linearly, and drive the jaws (30, 40) to close from the first pre-tightened position to the clamping position through the second drive surface (82). The electric crimping tool according to claim 1 is characterized in that the linear displacement distance of the second driving surface (82) from its initial position to the electric loading original position is smaller than the linear displacement distance of the first driving surface (72) causing the pliers (30, 40) to close from the starting position to the first pre-tightening position. The electric crimping tool according to claim 2, is characterized in that when the pliers mouth (30, 40) is in the starting position, the upper surface of the electric loader (80) is lower than the upper surface of the manual loader (70). The electric crimping tool according to claim 3, characterized in that the angle (α) formed by the two first driving surfaces (72) is greater than the angle (β) formed by the two second driving surfaces (82). The electric crimping tool according to claim 4, characterized in that the angle (α) formed by the two first drive surfaces (72) is preferably 30° to 60°, and the angle (β) formed by the two second drive surfaces (82) is preferably 25° to 55°. The electric crimping tool according to claim 5 is characterized in that: the fixing plate (50) includes an upper fixing plate and a lower fixing plate, the manual loader (70) has a manual guide platform (71), and the manual guide platform (71) passes through the guide groove (51) of the upper fixing plate (50); the electric loader (80) has an electric guide platform (81), and the electric guide platform 81 passes through the guide groove (51) of the lower fixing plate (50). The electric crimping tool according to any one of claims 1 to 6, characterized in that: the trigger (20) has a toothed portion (21) that meshes with a toothed portion (91) of the operating rod (90). The electric crimping tool according to claim 7 is characterized in that the trigger (20) has a support pin (22) that forms a rotatable movable pair with the waist groove (52) of the fixing plate (50). The electric crimping tool according to claim 8 is characterized in that: the electric crimping tool also includes a start switch (101), a start-stop switch (102) and a stop switch (103); when the trigger (20) closes the start switch (101), the motor (110) rotates forward; when the trigger (20) opens the start switch (101), the motor (110) rotates reversely; when the electric loader (80) moves to the predetermined squeezing position, the start-stop switch (102) is triggered; when the electric loader (80) moves to the initial position, the stop switch (103) is triggered. The electric crimping tool according to claim 9 is characterized in that: the electric crimping tool further comprises an emergency switch (104), and when the operating rod (90) triggers the emergency switch (104), the motor (110) reverses.