Electric crimping tool

Abstract

To achieve the above purpose, the electric crimping tool in the present application uses the following basic technical solutions: the electric crimping tool comprises the following: a motor (110) which is housed in the casing (10) and supplies power to a drive mechanism (120); a mounting plate (50) which is fixedly provided in the casing (10) as a support element; a pair of crimping jaws (30, 40) which are each hinged to the mounting plate (50) in a central area, with outer sections forming a crimping opening for clamping a workpiece and inner sections each being provided with an output element (32, 42); an electric loading element (80) and a manual loading element (70) which are provided in parallel and independently of each other;wherein the drive mechanism (120) converts a rotary movement of the motor (110) via a pair of screw threads into a linear movement of the electric loading element (80); wherein a trigger (20) articulated to the mounting plate (50) converts a movement of the trigger into a linear movement of the manual loading element (70) via an actuating lever (90). Since, in the present invention, the closing of the clamping jaws is not only driven sequentially manually and electrically, resulting in an electrical post-tensioning after the rapid manual clamping, but also because the manual and electric loading are arranged separately and partially overlap, the loading element is directly driven electrically, thereby reducing the "idle travel" of the manual loading element. This allows the overall working time to be shortened and work efficiency to be increased.

Description

An electric crimping tool Technical Field

[0001] 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

[0002] An electric crimping tool is a commonly used tool used in pipeline and power construction operations, using a transmission mechanism to drive a working head. Its typical structure is disclosed in Chinese Patent Application No. 201380042456.8, and includes a housing and a motor-driven transmission device housed in the housing for driving the crimping head to operate. The transmission device includes a loader that is driven by a motor and applied by hand, and acts on the jaws of the pliers. In this technical solution, the loader acting on the jaws of the pliers first closes the jaws under the action of a gripping force, and then, driven by a motor, loads the jaws through a travel member to clamp them. However, the loader is first actuated by gripping force and then driven by a motor, essentially connecting manual and electric operations in series on the same loader to achieve the closing and clamping of the jaws. Because manual operation moves the loader downward a certain distance, the subsequent motor drive must first move the travel element downward by the manual distance before it can act on the loader to generate force on the jaws. This "manual downward distance" is actually the "idle travel" after the motor is started, affecting operational efficiency. Furthermore, the technical solution in this patent application integrates both the electric and manual actions on the loader, making it impossible to adjust each separately based on actual needs. Summary of the Invention

[0003] 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 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.

[0004] In order to achieve the above objectives, the basic technical solution of the electric crimping tool of the present invention is as follows: it includes a housing; a motor, which is accommodated in the housing and provides power to the transmission mechanism; a fixed plate, which is fixedly arranged in the housing as a support member; a pair of pliers, each hinged at the middle part to the fixed plate, the outer section forming a jaw for squeezing the workpiece, and the inner section is respectively equipped with a follower; an electric loader and a manual loader arranged in parallel and independent of each other; the transmission mechanism converts the rotation of the motor into linear motion of the electric loader through a screw pair; a trigger hinged on the fixed plate converts the trigger motion into linear motion of the manual loader through an operating rod; the manual loader has a first driving surface on both sides that forms a cam pair with the corresponding follower; the electric loader has a second driving surface on both sides that forms a cam pair with the corresponding follower; when the trigger is manipulated to drive the manual loader to shift linearly and drive the pliers 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.

[0005] 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 manual loading and electric loading are set separately from each other and partially overlap in projection, the loading part is directly driven electrically, reducing the "idle stroke" of the manual loading part movement that must be eliminated when manually switching to electric in the prior art, thereby shortening the entire operation time and improving operation efficiency.

[0006] 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 less than the linear displacement distance of the first driving surface to close the jaws from the starting position to the first pre-tightening position.

[0007] 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.

[0008] 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.

[0009] 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°.

[0010] 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.

[0011] A further improvement of the present invention is that the trigger has a tooth portion that meshes with the tooth portion of the operating rod.

[0012] 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.

[0013] 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, the off switch is triggered.

[0014] 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

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] FIG1 is a perspective schematic diagram of an electric crimping tool according to a first embodiment of the present invention.

[0017] FIG2 is a front view of the transmission component of the embodiment of FIG1 at the initial position of the crimping operation.

[0018] FIG3 is a rear view of the transmission component of the embodiment of FIG1 at the initial position of the crimping operation.

[0019] FIG4 is a front view of the transmission component of the embodiment of FIG1 when the manual operation is completed.

[0020] FIG5 is a rear view of the transmission component of the embodiment of FIG1 when the manual operation is completed.

[0021] FIG6 is a front view of the transmission component of the embodiment of FIG1 when the electric operation is triggered.

[0022] FIG. 7 is a rear view of the transmission component of the embodiment of FIG. 1 when electrically operated and loaded into the original position.

[0023] FIG8 is a rear view of the transmission component of the embodiment of FIG1 when the electric operation is completed.

[0024] FIG9 is a rear view of the transmission component of the embodiment of FIG1 when electric release begins. DETAILED DESCRIPTION Example 1

[0025] The overall structure of the electric crimping tool of this embodiment is shown in FIG1 , and mainly comprises a housing 10, a transmission component housed within the housing 10, the transmission component comprising a motor 110, a transmission mechanism 120 driven by the motor 110, two pliers 30 and 40 that act on and squeeze a workpiece, a loading mechanism for driving the pliers 30 and 40 to rotate and operate, and a fixing plate 50 for supporting the pliers 30 and 40 and the loading mechanism. The loading mechanism comprises a manual loading member 70 and an electric loading member 80. The manual loading member is activated by a trigger 20, while the electric loading member 80 is activated by the transmission mechanism 120 driven by the motor 110.

[0026] The fixed plate 50 comprises an upper fixed plate and a lower fixed plate. The two pliers 30 and 40 are rotatably supported between the upper and lower fixed plates 50 via rotating shafts 31 and 41, respectively. The outer ends of the pliers 30 and 40 have jaws for squeezing a workpiece, and the inner ends are equipped with followers 32 and 42, respectively. These followers 32 and 42 are preferably rollers, but can also be cams. The rollers 32 and 42 are mounted on the pliers 30 and 40, respectively, via shafts 33 and 43, and are rotatable about the shafts 33 and 43.

[0027] The trigger 20 includes a support pin 22 rotatably connected to the fixing plate 50 , and a tooth portion 21 engaged with the tooth portion 91 of the operating rod 90 . The side surface of the tooth portion 21 can trigger the start switch 101 .

[0028] The manual loader 70 has a manual guide platform 71 and a manual drive surface 72 that abuts against the followers 32 and 42. The manual guide platform 71 passes through the guide slot 51 of the upper fixed plate 50. The operating rod 90 converts the movement of the trigger 20 into linear movement of the manual loader 70 along the guide slot 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 drive surfaces 72 on both sides of the manual loader 70 act on the followers 32 and 42 to form a cam pair, causing the jaws 30 and 40 to rotate around the axes 31 and 41, thereby achieving a pre-tightening operation.

[0029] The electric loader 80 is arranged in parallel with the manual loader 70 and independently of each other. The electric loader 80 has an electric guide platform 81 and an electric drive surface 82 that abuts 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 cause the electric loader 80 to 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, causing the pliers 30 and 40 to rotate around the axes 31 and 41 to achieve a clamping operation.

[0030] As shown in Figures 2 and 3 , the manual loader 70 and the electric loader 80 are in their initial positions, and the jaws 30 and 40 are in their starting positions. A user manually presses the trigger 20 to rotate about the rotation pin 22 to the manual operation completion position shown in Figures 4 and 5 . The teeth 21 of the trigger 20 drive the teeth 91 of the operating lever 90, causing the operating lever 90 to rotate about the rotation pin 93 . The pressing surface 92 of the operating lever 90 presses downward on the manual loader 70, causing it to move linearly along the guide groove 51 to the manual loading position shown in Figure 4 . The manual driving surface 72 acts on the rollers 32 and 42, causing the jaws 30 and 40 to rotate about the axes 31 and 41 from their starting positions to the extrusion preload position. The double-dashed line in Figure 4 shows the manual loader 70 in its initial position. The manual loader 70 moves downward a distance L1 from its initial position to the manual loading completion position. The larger the included angle α formed by the manual driving surfaces 72 on both sides, the faster the closing speed of the pliers mouth when rotating to the extrusion pre-tightening position. The included angle α is preferably 30° to 60°.

[0031] 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 Figure 6. The side of the tooth portion 21 closes the start switch 101, thereby starting the motor 110 to rotate forward. The motor 110 drives the screw 121 of the transmission mechanism 120 to rotate. The screw 121 drives the electric loader 80 to move linearly along the guide groove 51 from its initial position to the electric loading original position shown in Figure 7. At this 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 Figure 8. As the electric loader 80 continues to move downward, the electric drive surface 82 acts on the rollers 32 and 42, causing the jaws 30 and 40 to continue rotating about the axes 31 and 41 from their squeeze pre-tightening position to the compression 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 turning off the motor 110. The double-dashed line in Figure 7 shows the electric loader 80 in its initial position. The electric loader 80 moves downward a distance L2 from its initial position to the electric loading home position. The smaller the angle β formed by the electric drive surfaces 82 on both sides of the electric loader 80, the greater the clamping force of the jaws and the better the crimping effect. The angle β is preferably between 25° and 55°.

[0032] As shown in FIG3 , since the manual loader 70 and the electric loader 80 are separated from each other and partially overlap 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-loaded movement distance of the manual loader 70. 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 causes the jaws 30 and 40 to close from their starting position to the first pre-loaded 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.

[0033] As shown in FIG9 , the user releases the trigger 20 to activate the start switch 101, thereby starting the motor 110 in reverse rotation. The motor 110 drives the screw 121 of the transmission mechanism 120 to rotate, which in turn drives the electric loader 80 to move linearly in the opposite direction along the guide slot 51 to the initial position in FIG3 . At this point, 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. Under the bias of the return spring 131 , the trigger 20 moves to the initial position. The teeth 21 of the trigger 20 drive the teeth 91 of the operating rod 90, causing the operating rod 90 to rotate in the opposite direction about the rotation pin 93 . Under the bias of a spring (not shown), the manual loader 70 moves linearly along the guide slot 51 to the initial position in FIG2 . Under the bias of the return member, the jaws 30 and 40 rotate about the axes 31 and 41 to the initial position in FIG2 .

[0034] 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 in Figure 3. At this time, the upper surface of the electric guide platform 81 of the electric loader 80 triggers the shutdown switch 103, thereby shutting down the motor 110.

[0035] Practice has shown that compared with the prior art, the electric crimping structure of this embodiment uses a manual loader and an electric loader separately set up, which has the following significant advantages:

[0036] 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 linear displacement distance of the second driving surface from its initial position to the original position of the electric loading is smaller than the linear displacement distance of the first driving surface to close the jaws from their starting position to the first pre-tightening position, thereby reducing the distance of the no-load stroke during electric loading to make the crimping efficiency higher.

[0037] 2. The drive surfaces of the manual and electric loader are set at different angles as needed. The larger the angle α formed by the manual drive surfaces 72 on both sides, the faster the user can rotate the jaws to the pre-tightening position, improving crimping efficiency. The angle α is preferably within the range of 30° to 60°. The smaller the angle β formed by the electric drive surfaces 82 on both sides of the electric loader 80, the greater the clamping force of the jaws and the better the crimping effect. The angle β is preferably between 25° and 55°.

[0038] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. 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); Features Also includes: 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).

2. The electric crimping tool according to claim 1, 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 jaws (30, 40) to close from the starting position to the first pre-tightening position.

3. The electric crimping tool according to claim 2, characterized in that: When the jaws (30, 40) are in a state of being located at a starting position, the upper surface of the electric loading component (80) is lower than the upper surface of the manual loading component (70).

4. The electric crimping tool according to claim 3, characterized in that: The included angle (α) formed by the two first driving surfaces (72) is greater than the included angle (β) formed by the two second driving surfaces (82).

5. The electric crimping tool according to claim 4, characterized in that: The included angle (α) formed by the two first driving surfaces (72) is preferably 30° to 60°, and the included angle (β) formed by the two second driving surfaces (82) is preferably 25° to 55°.

6. The electric crimping tool according to claim 5, characterized in that: The fixing plate (50) comprises an upper fixing plate and a lower fixing plate, the manual loading member (70) comprises a manual guide platform (71), and the manual guide platform (71) passes through a guide slot (51) of the upper fixing plate (50); the electric loading member (80) comprises an electric guide platform (81), and the electric guide platform 81 passes through a guide slot (51) of the lower fixing plate (50).

7. 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).

8. The electric crimping tool according to claim 7, characterized in that: The trigger (20) has a support pin (22) which forms a rotatable movable pair with the waist-shaped groove (52) of the fixing plate (50).

9. The electric crimping tool according to claim 8, characterized in that: The electric crimping tool further comprises 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; and when the electric loader (80) moves to the initial position, the stop switch (103) is triggered.

10. The electric crimping tool according to claim 9, characterized in that: The electric crimping tool further comprises an emergency switch (104); when the operating rod (90) triggers the emergency switch (104), the motor (110) rotates in the reverse direction.