Screw Shear

Abstract

To provide a screw shearing machine which enables improvement of reset efficiency and reduction of noise during operation.SOLUTION: A shear assembly includes a shear base and a shear arm which are hinged with each other. A rotary cam is installed on the shear base, a track groove is formed on a sidewall of the cam, and a first drive member which engages with an outer sidewall of the cam and a second drive member which engages with the track groove are installed on the shear arm. The shear arm has a shearing position and an open position. The cam pushes the first drive member to cause the first drive member to move along the outer sidewall of the cam and thereby shift the shear arm from the open position to the shearing position. The cam pulls the second drive member to cause the second drive member to move along an inner wall of the track groove and thereby shift the shear arm from the shearing position to the open position.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the field of cutting processes, in particular to screw shears. [Background technology]

[0002] A screw shear is a common tool for shearing screws, and includes a shear seat and a shear arm. A cam drives the shear arm to swing relative to the shear seat, causing a fixed blade on the shear seat to engage with a movable blade on the shear arm, thereby shearing the screw.

[0003] However, when the fixed blade and the movable blade separate, they are conventionally reset using a spring, and the elastic force of the spring is used to separate the fixed blade and the movable blade, making it easy to perform the next shearing operation.However, the reset efficiency of the spring is low and it is susceptible to the effects of spring fatigue, making it easy for situations to occur where it cannot be reset.

[0004] Therefore, the reset structure is designed such that a pin shaft is installed on the shear seat, a track plate is installed on the shear arm, and a track groove is provided on the track plate. The pin shaft is rotated by a cam, and when the pin shaft moves along the track groove, the shear arm is reset. This structure improves the reset efficiency, and the ratio of reset and shear time can be controlled by the track groove, thereby achieving better shear control.

[0005] However, this structure requires the installation of a track plate on the shear arm, which increases the number of parts and the complexity of assembly of the entire screw shear, and also places high requirements on the strength of the track plate. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION The object of the present invention is to provide a screw shear, which can effectively solve the problems that the conventional screw shear is driven and reset by a track plate, which has a complicated structure and high requirements for the strength of the track plate. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present invention is realized through the following technical solutions.

[0008] A screw shears machine, wherein the shear assembly includes a shear seat and a shear arm hinged to each other, a fixed blade installed on the shear seat, a movable blade installed on the shear arm to engage with the fixed blade for shearing, a rotating cam installed on the shear seat, a track groove installed on a side wall of the cam, a first drive member installed on the shear arm to engage with an outer wall of the cam and a second drive member installed on the shear arm to engage with the track groove, the shear arm has a shear position and an open position, the cam pushes the first drive member to move along the outer wall of the cam, causing the shear arm to switch from the open position to the shear position, and the cam pulls the second drive member to move along the inner wall of the track groove, causing the shear arm to switch from the shear position to the open position.

[0009] Preferably, the second driving member is a pin shaft, one end of which is mounted on the shear arm and the other end of which is inserted into the track groove, so that the pin shaft can effectively reduce friction and resistance when engaging with the track groove, and the pin shaft is not easily jammed at the corner of the track groove, and can engage with the track groove smoothly.

[0010] Preferably, one end of the pin shaft is mounted on a rotary plate, and the rotary plate is rotatably connected to the shear arm. By adding the rotary plate, the position of the pin shaft can be freely adjusted within a certain range according to the trajectory of the trajectory groove, thereby reducing the difficulty of assembly.

[0011] Preferably, one end of the pin shaft is rotatably connected to the rotary plate, and the rotation axis of the pin shaft and the rotary plate are parallel to the rotation axis of the shear arm. The pin shaft itself can rotate to further reduce the friction force between the pin shaft and the groove wall of the track groove, and the rotation axis of the pin shaft is parallel to the rotation axis of the rotary plate, so that the rotary plate can be adjusted to the pin shaft position more smoothly.

[0012] Preferably, the first driving member is a roller rotatably connected to the shear arm, or a slider fixedly connected to the shear arm, which can accurately feed back the passive force applied from the cam to the shear arm and reduce friction between the first driving member and the cam.

[0013] Preferably, the shear seat and the shear arm are hingedly connected by a shear shaft, which can reduce the frictional force when the shear arm rotates relative to the shear seat and can maintain stability relative to the shear seat when the shear arm swings.

[0014] Preferably, the shear arm includes a shear end and a driven end, the movable blade is mounted on the shear end, the first driving member and the second driving member are mounted on the driven end, and the shear end and the driven end are respectively mounted on both sides of the shear shaft, which makes it easy to position the movable blade and the two driving members and allows the driving members to obtain a larger moment arm.

[0015] Preferably, the shear seat includes a fixed end and a driving end, the fixed blade is fixed to the fixed end, the cam is rotatably connected to the driving end, and the fixed end and the driving end are respectively provided on both sides of the shear shaft. By providing the fixed end and the driving end on both sides of the shear shaft, interference between the fixed blade and the cam can be avoided.

[0016] Preferably, the inner wall of the track groove is parallel to the outer wall of the cam, which makes it easier to process the cam and the track groove and also makes it easier to position the first and second driving members.

[0017] Preferably, when the shear arm switches from the open position to the shear position, the second drive member contacts the inner wall of the track groove, and when the shear arm switches from the shear position to the open position, the first drive member contacts the outer wall of the cam. When the first and second drive members are not functioning, they still contact the corresponding positions on the cam, thereby avoiding gaps between the first and second drive members and the cam, and preventing noise caused by the first and second drive members colliding with the cam when the shear arm switches from the open position and the shear position. [Effects of the Invention]

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The track groove is installed on the side wall of the cam and engaged with the second driving member of the shear arm, which solves the problem that the structure of the traditional track plate is complicated.

[0020] By opening the track groove on the side wall of the cam, the strength of the cam can be utilized to ensure that the track groove also has sufficient strength. In addition, when the shear arm switches between the open position and the shearing position, the driving force is provided by the cam. This makes the shear arm switch between the open position and the shearing position more smoothly and effectively prevents jamming. At the same time, the impact on the cam when the shear arm switches between the open position and the shearing position can be reduced, and the noise during the operation of the screw shears can be reduced.

[0021] Since the cam itself has high strength, providing a track groove on the side wall of the cam, provided that the cam has sufficient strength, the track groove can also have high strength, which can greatly improve the reciprocating life of the screw shears. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is an exploded view of the screw shears of the present invention. [Figure 2] 1 is a structural schematic diagram of the screw shears of the present invention in an open position. FIG. [Figure 3] 1 is a structural schematic diagram of the screw shears of the present invention immediately after the movable blade comes into contact with the screw to be sheared. [Figure 4] 1 is a structural schematic diagram of the screw shears of the present invention at the shearing position. FIG. [Figure 5] FIG. 2 is a structural schematic diagram of the engagement between the first driving member and the cam in the screw shears of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the present invention will be given of the embodiments, examples of which are shown in the drawings. The embodiments described below with reference to the drawings are illustrative and are for the purpose of interpreting the present invention, but should not be understood as limiting the present invention.

[0024] In describing the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. are based on the orientations or positional relationships shown in the drawings, are intended merely to simplify the present invention and description, and do not indicate or imply that the devices or components referred to have a particular orientation, nor should they be construed as limitations on the present application, as they must be constructed and operated in a particular orientation.

[0025] Furthermore, the terms "first" and "second" are for descriptive purposes only and are not intended to indicate or imply relative importance or the number of technical features indicated.

[0026] Thus, a feature defined as "first" or "second" expressly or implicitly includes at least one of the features.

[0027] In describing the present invention, the term "plurality" means at least two, for example, two, three, etc., unless expressly limited otherwise.

[0028] In the present invention, unless otherwise expressly defined and limited, the terms "attached," "connected," "coupled," "fixed," etc., are to be understood in a broad sense, unless otherwise clearly limited, and may refer to, for example, a fixed connection, a detachable connection, or being integral, mechanically connected, electrically connected, or capable of communicating with each other, directly connected, indirectly connected via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements.

[0029] Those skilled in the art can understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] As shown in FIGS. 1 to 5, in an embodiment of the screw shears of the present invention, the screw shears include a shear seat 100 and a shear arm 200 that are hinged to each other, a fixed blade 300 is provided on the shear seat 100, a movable blade 400 that engages with the fixed blade 300 is provided on the shear arm 200, and a driving device is provided on the shear seat 100 and the shear arm 200, and the shear arm 200 is driven to swing relative to the shear seat 100, thereby realizing the screw shearing action by the fixed blade 300 and the movable blade 400.

[0031] The drive device includes a cam 500 rotatably mounted on the shear seat 100, a track groove 510 provided on an end surface of the cam 500 away from the shear seat 100, a first drive member 600 provided on the shear arm 200 that engages with an outer wall 520 of the cam 500, and a second drive member 700 further provided on the shear arm 200 that engages with the track groove 510.

[0032] The shearing arm 200 includes a shearing position and an open position. The shearing position is a position where the movable blade 400 and the fixed blade 300 engage to shear the screw, and the open position is a position where the movable blade 400 is at the farthest distance from the fixed blade 300, i.e., there is a sufficient distance between the movable blade 400 and the fixed blade 300 to penetrate the screw to be sheared.

[0033] As the cam 500 rotates, the outer wall 520 of the cam 500 contacts the first driving member 600, pushing the first driving member 600 to move along the outer wall 520 of the cam 500, causing the shear arm 200 to switch from the open position to the shear position; as the cam 500 continues to rotate, the track groove 510 in the cam 500 pulls the second driving member 700 to move along the inner wall of the track groove 510, causing the shear arm 200 to switch from the shear position to the open position, thereby forming a reciprocating oscillation of the shear arm 200 relative to the shear seat 100.

[0034] By installing the track groove 510 on the cam 500, the strength of the cam 500 can be utilized to open the track groove 510 on its side wall, so that the side wall of the track groove 510 also has sufficient strength, and it is easier to switch between the open position and the shear position when installed. By tuning the positions of the first driving member 600 and the second driving member 700, the shear arm 200 can switch between the open position and the shear position more smoothly, and jamming can be avoided.

[0035] Furthermore, the second driving member 700 may employ a pin shaft or a roller. Considering the size of the track groove 510 and the dimensions of the bending portion, the second driving member 700 generally employs a pin shaft, which has sufficient rigidity for transmitting power, has small engagement resistance with the track groove 510, and can accommodate the small curve radius of the track groove 510. One end of the pin shaft is installed on the shear arm 200, and the other end extends into the track groove 510 and engages with the inner wall of the track groove 510.

[0036] In order to better adjust the positional relationship between the second driving member 700 and the track groove 510 and to prevent interference when the first driving member 600 engages with the cam 500, a rotating plate 210 is installed at the lower end of the shearing arm 200, and the rotating plate 210 is rotatably connected to the shearing arm 200. One end of the pin shaft is installed on the rotating plate 210, so that the pin shaft has a certain adaptive adjustment distance and the position of the pin shaft and the track groove 510 can be adjusted.

[0037] Furthermore, the pin shaft is fixedly connected to the rotating plate 210, and thus rolling friction occurs between the pin shaft and the track groove 510, reducing the frictional resistance between them and reducing the noise between the pin shaft and the track groove 510 during operation.

[0038] In addition, the rotation axis of the pin shaft and the rotating plate 210 are parallel to the rotation axis of the shear arm 200, which prevents a component force from being generated in the axial direction on the rotating plate 210 when the pin shaft rolls along the inner wall of the track groove 510, and ensures the stability of the connection between the rotating plate 210 and the shear arm 200.

[0039] Generally, the first driving member 600 employs a roller, which is rotatably connected to the shear arm 200 via a roller shaft 240. The roller rolls along the outer wall 520 of the cam 500, thereby pushing the shear arm 200 from the open position to the shear position via the cam 500. The roller operating method reduces vibration and has low resistance when the first driving member 600 moves along the outer wall 520 of the cam 500.

[0040] The first driving member 600 may adopt a slider in addition to a roller, which can also achieve the purpose of the cam 500 pushing the shear arm 200 to move from the open position to the shear position.

[0041] In order to better realize the shearing operation of the fixed blade 300 and the movable blade 400, the shear seat 100 and the shear arm 200 are joined together to form an X shape, that is, the middle of the shear seat 100 and the middle of the shear arm 200 are hingedly connected by the shear axis 800.

[0042] The shear arm 200 includes a shearing end 220 and a driven end 230, the movable blade 400 is removably fixed to the shearing end 220, the first drive member 600 and the second drive member 700 are installed at the driven end 230, i.e., the position shown in FIG. 2, the shearing end 220 is located at the top of the shear arm 200, and the driven end 230 is located at the bottom of the shear arm 200.

[0043] The shear seat 100 includes a fixed end 110 and a driving end 120. The fixed blade 300 is fixed to the fixed end 110, and the cam 500 is rotatably connected to the driving end 120. Similarly, according to the position shown in FIG. 2, the fixed end 110 is located at the top of the shear arm 200, and the driving end 120 is located at the bottom of the shear arm 200. This facilitates the engagement between the fixed blade 300 and the movable blade 400, and also allows the distance from the shear end 220 and the driven end 230 of the shear arm 200 to the shear shaft 800 to be adjusted, thereby obtaining a large force arm for the driven end 230.

[0044] The inner wall of the track groove 510 is arranged parallel to the outer wall 520 of the cam 500, i.e., the shape enclosed by the inner wall of the track groove 510 is similar to the shape of the outer wall 520 of the cam 500, which effectively reduces the difficulty of processing and designing the cam 500. Furthermore, because the shape of the track groove 510 is similar to the shape of the outer wall 520 of the cam 500, the first driving member 600 and the second driving member 700 can be more easily installed when adjusted.

[0045] When the shear arm 200 switches from the open position to the shear position, the cam 500 pushes the shear arm 200 to move, and the first driving member 600 moves along the outer wall 520 of the cam 500. At this time, the second driving member 700 may or may not contact the track groove 510. At this time, it is preferable that the second driving member 700 contacts the inner wall of the track groove 510. In this way, when the shear position switches from the open position to the shear position, there is no gap between the second driving member 700 and the track groove 510, and no impact occurs. This is advantageous to extend the service life of the cam 500 and the second driving member 700 and to reduce the operating noise of the screw shears.

[0046] Of course, when the shear arm 200 switches from the shear position to the open position, it is preferable that the first drive member 600 also constantly contacts the outer wall 520 of the cam 500, so as to reduce the impact between the first drive member 600 and the cam 500 when the shear arm 200 switches from the open position to the shear position.

[0047] As shown in FIG. 2, in the initial state during use, the shearing arm 200 is in the open position, at which time the gap between the movable blade 400 and the fixed blade 300 is the largest, and the screw to be sheared is extended between the movable blade 400 and the fixed blade 300. The cam 500 is driven to rotate by the motor, and as the cam 500 rotates, it pushes the first driving member 600, which in turn drives the shearing arm 200 to swing around the shearing shaft 800 as its axis. At this time, the shearing arm 200 switches from the open position to the shearing position. As shown in FIG. 3, the movable blade 400 of the shearing arm 200 is in contact with the screw, which is the critical position where it is ready to shear. As shown in FIG. 4, as the cam 500 rotates, the shearing arm 200 reaches the shearing position, and the screw is sheared.

[0048] As the cam 500 continues to rotate, the shearing arm 200 switches from the shearing position to the open position, and at this time the track groove 510 interacts with the second driving member 700, and with the rotation of the cam 500, the track groove 510 pulls the second driving member 700, gradually increasing the gap between the movable blade 400 and the fixed blade 300 until the shearing arm 200 reaches the open position.

[0049] Then, the cam 500 continues to rotate, and the shear arm 200 repeats the above process, repeatedly switching between the shear position and the open position. By providing the track groove 510 on the cam 500, the shear arm 200 can smoothly switch back and forth between the open position and the shear position, effectively avoiding jamming. At the same time, the impact on the cam 500 when the shear arm 200 switches between the open position and the shear position can be reduced, thereby reducing noise during operation of the screw shears.

[0050] The above are merely specific examples of the present invention, and the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art in the field of the present invention are included in the patent scope of the present invention. [Explanation of symbols]

[0051] shear seat 100 fixed end 110 Driving end 120 Shear Arm 200 Rotating plate 210 shear end 220 Driven end 230 Roller shaft 240 Fixed blade 300 Movable blade 400 Cam 500 Locus groove 510 outer wall 520 First driving member 600 Second driving member 700 shear axis 800

Claims

1. A screw shears machine in which the shear assembly includes a shear seat and a shear arm hinged to each other, a fixed blade is mounted on the shear seat, and a movable blade is mounted on the shear arm to engage with the fixed blade for shearing, A cam, the rotation axis of which is rotatably fitted to the shear seat, is installed so as to protrude from the outer surface of the shear seat, a track groove is installed on an end surface of the cam on the side away from the shear seat, and a first driving member that engages with the outer wall of the cam and a second driving member that engages with the track groove are installed on the shear arm, the shear arms include a shear position and an open position, the first drive member moves along an outer wall of a cam to switch the shear arms from the open position to the shear position, and the second drive member moves along an inner wall of the track groove to switch the shear arms from the shear position to the open position.

2. 2. The screw shears according to claim 1, wherein the second driving member is a pin shaft, one end of the pin shaft is mounted on the shear arm, and the other end of the pin shaft extends into the track groove.

3. 3. The screw shears according to claim 2, wherein one end of the pin shaft is mounted on a rotary plate, and the rotary plate is rotatably connected to the shear arm.

4. 4. The screw shears according to claim 3, wherein one end of the pin shaft is rotatably connected to the rotary plate, and the rotation axis of the pin shaft and the rotation axis of the rotary plate are parallel to the rotation axis of the shear arm.

5. 2. The screw shears of claim 1, wherein the first drive member is a roller rotatably coupled to the shear arm, or the first drive member is a slider fixedly coupled to the shear arm.

6. 2. The screw shears of claim 1, wherein the shear seat and the shear arm are hingedly connected by a shear shaft.

7. 7. The screw shears of claim 6, wherein the shear arm includes a shearing end and a driven end, the movable blade is mounted on the shearing end, the first driving member and the second driving member are mounted on the driven end, and the shearing end and the driven end are respectively provided on both sides of the shear shaft.

8. 7. The screw shears according to claim 6, wherein the shear seat includes a fixed end and a driving end, the fixed blade is fixed to the fixed end, the cam is rotatably connected to the driving end, and the fixed end and the driving end are respectively provided on both sides of the shear shaft.

9. The screw shears according to claim 1, wherein the inner wall of the track groove is disposed parallel to the outer wall of the cam.

10. 2. The screw shears of claim 1, wherein the second drive member contacts the inner wall of the track groove when the shear arm switches from the open position to the shear position, and the first drive member contacts the outer wall of the cam when the shear arm switches from the shear position to the open position.

Images