Adjustable cam speed device

Abstract

The utility model discloses an adjustable cam speed adjusting device which comprises a machine frame, a power input shaft, a power output shaft and an eccentric speed adjusting mechanism, and the power input shaft and the power output shaft are arranged on the machine frame. The power input shaft is provided with a first rotating disc, and a first guide groove is formed in the first rotating disc. The power output shaft is provided with a first linkage piece; the eccentric speed regulating mechanism comprises a mounting seat, a rotating shaft, a second linkage piece, a second rotating disc and a position regulating mechanism, the mounting seat is arranged on the rack through the position regulating mechanism, the rotating shaft is arranged in the mounting seat, the second linkage piece is arranged on the rotating shaft, and the second linkage piece is located in the first guide groove; the second rotating disc is arranged on the rotating shaft, a second guide groove is formed in the second rotating disc, and the first linkage piece is located in the second guide groove. According to the adjustable cam speed device, the rotating speed of the power output shaft can be adjusted, the welding requirements of tank bodies with different lengths can be met, and the welding speed is matched with the conveying rhythm of the tank bodies.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance welding, in particular to an adjustable cam speed device. Background Art

[0002] The current common canning process involves using shears to cut coiled material into rectangular sheets. After rolling the sheets into a cylindrical can body, a resistance welding machine is used to weld the seams where the sheets meet. This process utilizes resistance heat generated by an electric current passing through a first welding wheel, the sheet contact surface, and a second welding wheel, heating the sheet weld to a plastic or molten state. Pressure is then applied to join the two edges. This welding method offers advantages such as high efficiency and relatively stable weld quality, making it a key component of canning production lines.

[0003] However, existing resistance welding can body welding machines have a significant practical problem: the inability to adjust the welding wheel drive speed according to the length of the can body. Maintaining a constant drive speed during the welding process for can bodies of varying lengths can lead to a series of adverse consequences. If the welding speed is too slow, the welding speed cannot keep up with the conveying speed during the welding of longer can bodies, resulting in welding interruptions, weld leaks, and incomplete welding of the can body. If the welding speed is too fast, the weld seam cannot be fully heated when welding shorter can bodies, resulting in a weak weld. This can easily lead to quality defects such as cold welds and desoldering, seriously affecting the sealing performance and overall strength of the can body.

[0004] Furthermore, due to the spacing between adjacent cans, and the fact that cans are typically pushed at equal intervals and a constant speed, ideally, the welding wheel should operate at a low speed when welding the cans to ensure sufficient heating time and pressure; while operating at a high speed when passing through the gaps, quickly crossing areas without welds and avoiding time-consuming idling. However, the drive systems of existing resistance welding can bodies mostly use a fixed speed control mode or are only capable of a limited number of gear adjustments. Therefore, the resistance welding can body welding machines currently on the market not only struggle to precisely match the welding requirements of cans of varying lengths, but also fail to dynamically adapt the welding speed to the can conveying rhythm. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an adjustable cam speed device, which can adjust the speed of the power output shaft that drives the welding wheel to rotate, and can change the speed every half a cycle, which can not only meet the welding requirements of can bodies of different lengths, but also realize dynamic adaptation of the welding speed and the can body conveying rhythm.

[0006] In order to solve the above technical problems, the technical solutions adopted are as follows:

[0007] An adjustable cam speed device is characterized in that it includes a frame, a power input shaft, a power output shaft and an eccentric speed regulating mechanism, the power input shaft and the power output shaft are rotatably arranged at both ends of the frame, and the axes of the power input shaft and the power output shaft are on the same straight line; a first turntable is provided at the power output end of the power input shaft, a first guide groove extending from the edge to the middle is opened on the first turntable, and the first guide groove passes through the axis of the power input shaft; a first linkage is provided at the power input end of the power output shaft, and the first linkage is eccentrically arranged with the power output shaft; the eccentric speed regulating mechanism includes a mounting seat, a rotating shaft, a second A linkage, a second turntable and a position adjustment mechanism capable of driving the mounting seat to move left and right. The mounting seat can be movably arranged on the frame left and right through the position adjustment mechanism. The rotating shaft can be rotatably arranged in the mounting seat. The second linkage is arranged on the power input end of the rotating shaft, and the second linkage is eccentrically arranged with the rotating shaft. The second linkage is in the first guide groove and can move along the first guide groove; the second turntable is arranged on the power output end of the rotating shaft. A second guide groove extending from the edge to the middle is opened on the second turntable, and the second guide groove passes through the axis of the rotating shaft. The first linkage is in the second guide groove and can move along the second guide groove.

[0008] In the above-mentioned adjustable cam speed device, the power input shaft is connected to the transmission mechanism of the resistance welding can body welding machine, and the power output shaft is connected to the welding wheel. During transmission, the power input shaft drives the second linkage member through the first turntable, thereby driving the rotating shaft to rotate, and then the rotating shaft drives the second turntable to rotate, thereby driving the power output shaft to rotate through the first linkage member to achieve power transmission. According to the needs of speed regulation, the position of the rotating shaft can be adjusted by the position adjustment mechanism. When the axis of the rotating shaft and the axis of the power output shaft are in the same straight line, when the power input shaft drives the second linkage member to rotate through the first turntable, and when the rotating shaft drives the first linkage member to rotate through the second turntable, the rotation speed of each position of the rotating shaft is the same, so the rotation speed of each position of the power output shaft is also the same when rotating; when the axis of the rotating shaft is not in the same straight line with the axis of the power output shaft, when the power input shaft drives the second linkage member to rotate through the first turntable, the second linkage member will rotate with the rotation. Moving along the first guide groove causes the second linkage to have a faster linear speed at a position close to the axis of the power input shaft and a slower linear speed at a position away from the axis of the power input shaft. Therefore, the speed of the rotating shaft will continue to change during the rotation process. Similarly, when the rotating shaft drives the first linkage to rotate through the second turntable, the first linkage will also move along the second guide groove as it rotates, thereby further transmitting the speed change to the power output shaft, so that the power output shaft can rotate one circle, with a faster speed for half of the circle and a slower speed for the other half of the circle. This adjustable cam speed device can adjust the speed of the power output shaft by adjusting the distance between the axis of the rotating shaft and the axis of the power output shaft, and can also achieve a speed change every half circle. It can not only adjust the welding speed according to the welding requirements of can bodies of different lengths, but also achieve dynamic adaptation of the welding speed to the can body conveying rhythm.

[0009] In a preferred embodiment, the distance between the first linkage member and the axis of the power take-off shaft is greater than the distance between the second linkage member and the axis of the rotating shaft. This arrangement allows the difference in the speed of the rotating shaft to be further increased and transmitted to the power take-off shaft even when the axes of the rotating shaft and the power take-off shaft are not aligned.

[0010] In a preferred embodiment, the first guide groove and the second guide groove extend in opposite directions. With this arrangement, the first linkage member and the second linkage member can be respectively located at diagonal positions, which can further expand the difference in the speed of the rotating shaft and transmit it to the power output shaft.

[0011] In a further preferred embodiment, the position adjustment mechanism includes at least one adjustment rod and at least two guide rods. The frame is provided with at least one guide hole, the number of guide holes being the same as the number of adjustment rods and corresponding one to one. The adjustment rod is fixedly mounted on the mounting base, extending out of the frame and positioned in the guide hole. The guide rods are fixedly mounted on the frame and arranged in the left-right direction. The guide rods are parallel to each other and perpendicular to the adjustment rods. The mounting base is mounted on the guide rods so as to be movable left-right. During adjustment, the mounting base can be moved left-right along the guide rods by pushing the adjustment rod, thereby adjusting the position of the rotating shaft. During adjustment, the first guide groove and the second guide groove need to be adjusted to positions that are in a left-right direction.

[0012] In a preferred embodiment, the first linkage member is provided with a first bearing, the inner ring of the first bearing being connected to the first linkage member, and the outer ring of the first bearing being in contact with the second guide groove; the second linkage member is provided with a second bearing, the inner ring of the second bearing being connected to the second linkage member, and the outer ring of the second bearing being in contact with the first guide groove. When the first turntable drives the second linkage member, and the second turntable drives the first linkage member to rotate, the second linkage member and the first linkage member can also move along the corresponding first and second guide grooves via the bearings.

[0013] In a preferred embodiment, the eccentric speed regulating mechanism further includes a third bearing, which is sleeved on the rotating shaft, with the inner ring of the third bearing connected to the rotating shaft and the outer ring of the third bearing connected to the mounting seat. This structure ensures that the rotation of the rotating shaft and the translation of the mounting seat do not interfere with each other.

[0014] The beneficial effect of the utility model is that the adjustable cam speed device can adjust the speed of the power output shaft that drives the welding wheel to rotate, and can change the speed every half a cycle, which can not only meet the welding requirements of can bodies of different lengths, but also achieve dynamic adaptation of the welding speed and the can body conveying rhythm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an adjustable cam speed device in an embodiment of the present utility model;

[0016] Figure 2 This is a structural diagram of the adjustable cam speed device in the embodiment of the utility model after part of the frame is removed;

[0017] Figure 3 for Figure 2 sectional view of

[0018] Figure 4 This is a schematic structural diagram of the first turntable in an embodiment of the present utility model;

[0019] Figure 5This is a schematic structural diagram of the second turntable in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] like Figure 1-5 The adjustable cam speed device shown in the figure includes a frame 1, a power input shaft 2, a power output shaft 3 and an eccentric speed regulating mechanism. The power input shaft 2 and the power output shaft 3 are rotatably arranged at the two ends of the frame 1, and the axes of the power input shaft 2 and the power output shaft 3 are on the same straight line; the power output end of the power input shaft 2 is provided with a first turntable 4, and the first turntable 4 is provided with a first guide groove 401 extending from the edge to the middle, and the first guide groove 401 passes through the axis of the power input shaft 2; the power input end of the power output shaft 3 is provided with a first linkage 5, and the first linkage 5 is eccentrically arranged with the power output shaft 3; the eccentric speed regulating mechanism includes a mounting seat 6, a rotating shaft 7, a second linkage 8, a second turntable 9 and a position adjustment mechanism 10 capable of driving the mounting seat 6 to translate left and right. The mounting seat 6 is movably arranged on the frame 1 through the position adjustment mechanism 10. The rotating shaft 7 is rotatably arranged in the mounting seat 6. The second linkage member is arranged on the power input end of the rotating shaft 7, and the second linkage member 8 is eccentrically arranged with the rotating shaft 7. The second linkage member 8 is in the first guide groove 401 and can move along the first guide groove 401; the second turntable 9 is arranged on the power output end of the rotating shaft 7, and the second turntable 9 is provided with a second guide groove 901 extending from the edge to the middle, and the second guide groove 901 passes through the axis of the rotating shaft 7. The first linkage member 5 is in the second guide groove 901 and can move along the second guide groove 901.

[0022] In the above-mentioned adjustable cam speed device, the power input shaft 2 is connected to the transmission mechanism of the resistance welding can body welding machine, and the power output shaft 3 is connected to the welding wheel. During transmission, the power input shaft 2 drives the second linkage 8 through the first turntable 4, thereby driving the rotating shaft 7 to rotate, and then the rotating shaft 7 drives the second turntable 9 to rotate, thereby driving the power output shaft 3 to rotate through the first linkage 5, thereby realizing power transmission. According to the needs of speed regulation, the position of the rotating shaft 7 can be adjusted by the position adjustment mechanism 10. When the axis of the rotating shaft 7 and the axis of the power output shaft 3 are in the same straight line, when the power input shaft 2 drives the second linkage 8 to rotate through the first turntable 4, and when the rotating shaft 7 drives the first linkage 5 to rotate through the second turntable 9, the rotation speed of each position of the rotating shaft 7 is the same, so the rotation speed of each position of the power output shaft 3 is also the same when rotating; when the axis of the rotating shaft 7 is not in the same straight line with the axis of the power output shaft 3, when the power input shaft 2 drives the second linkage 8 to rotate through the first turntable 4, the second linkage 8 will rotate with the rotation. The rotating shaft 7 moves along the first guide groove 401, thereby causing the second linkage member 8 to have a faster linear speed at a position close to the axis of the power input shaft 2 and a slower linear speed at a position away from the axis of the power input shaft 2. Therefore, the speed of the rotating shaft 7 will also continuously change during the rotation process. Similarly, when the rotating shaft 7 drives the first linkage member 5 to rotate through the second turntable 9, the first linkage member 5 will also move along the second guide groove 901 as it rotates, thereby further transmitting the speed change to the power output shaft 3, so that the power output shaft 3 can achieve a faster speed for half a circle and a slower speed for the other half a circle during one rotation. This adjustable cam speed device can adjust the speed of the power output shaft 3 by adjusting the distance between the axis of the rotating shaft 7 and the axis of the power output shaft 3, and can also achieve a speed change every half a circle. It can not only adjust the welding speed according to the welding requirements of can bodies of different lengths, but also achieve dynamic adaptation of the welding speed to the can body conveying rhythm.

[0023] The distance between the first linkage member 5 and the axis of the power output shaft 3 is greater than the distance between the second linkage member 8 and the axis of the rotating shaft 7. In this way, even if the axis of the rotating shaft 7 is not coaxial with the axis of the power output shaft 3, the difference in the speed change of the rotating shaft 7 can be further expanded and transmitted to the power output shaft 3.

[0024] The first guide groove 401 and the second guide groove 901 extend in opposite directions. Through this arrangement, the first linkage member 5 and the second linkage member 8 can be respectively in diagonal positions, which can further expand the speed difference of the rotating shaft 7 and transmit it to the power output shaft 3.

[0025] The position adjustment mechanism 10 includes two adjustment rods 1001 and multiple guide rods 1002. The frame 1 is provided with two guide holes 101, which are equal in number to and correspond to the adjustment rods 1001. The adjustment rods 1001 are fixedly mounted on the mounting base 6, extending out of the frame 1 and located in the guide holes 101. The guide rods 1002 are fixedly mounted on the frame 1 and arranged in a left-right direction. Each guide rod 1002 is parallel to each other and perpendicular to the adjustment rods 1001. The mounting base 6 is mounted on the guide rods 1002 so as to be movable left and right. During adjustment, the adjustment rod 1001 can be pushed to move the mounting base 6 left and right along the guide rods 1002, thereby adjusting the position of the rotating shaft 7. During adjustment, the first guide slot 401 and the second guide slot 901 need to be adjusted to positions that are oriented left and right.

[0026] The first linkage member 5 is provided with a first bearing 501, the inner ring of which is connected to the first linkage member 5, and the outer ring of which is in contact with the second guide groove 901. The second linkage member 8 is provided with a second bearing 801, the inner ring of which is connected to the second linkage member 8, and the outer ring of which is in contact with the first guide groove 401. When the first rotating disk 4 pushes the second linkage member 8, and the second rotating disk 9 pushes the first linkage member 5 to rotate, the second linkage member 8 and the first linkage member 5 can also move along the corresponding first guide groove 401 and second guide groove 901 via the bearings.

[0027] The eccentric speed regulating mechanism further includes a third bearing 11, which is sleeved on the rotating shaft 7, with the inner ring of the third bearing 11 connected to the rotating shaft 7 and the outer ring of the third bearing 11 connected to the mounting seat 6. This structure ensures that the rotation of the rotating shaft 7 and the translation of the mounting seat 6 do not interfere with each other.

Claims

1. An adjustable cam speed device, characterized in that: The invention comprises a frame, a power input shaft, a power output shaft and an eccentric speed regulating mechanism, wherein the power input shaft and the power output shaft are rotatably arranged at both ends of the frame, and the axes of the power input shaft and the power output shaft are in the same straight line; a first turntable is provided at the power output end of the power input shaft, a first guide groove extending from the edge to the middle is opened on the first turntable, and the first guide groove passes through the axis of the power input shaft; a first linkage is provided at the power input end of the power output shaft, and the first linkage is eccentrically arranged with the power output shaft; the eccentric speed regulating mechanism comprises a mounting seat, a rotating shaft, a second linkage, a second turntable and A position adjustment mechanism can drive the mounting seat to move left and right. The mounting seat can be movably arranged on the frame left and right through the position adjustment mechanism. The rotating shaft can be rotatably arranged in the mounting seat. The second linkage member is arranged on the power input end of the rotating shaft, and the second linkage member is eccentrically arranged with the rotating shaft. The second linkage member is in the first guide groove and can move along the first guide groove; the second turntable is arranged on the power output end of the rotating shaft, and a second guide groove extending from the edge to the middle is opened on the second turntable, and the second guide groove passes through the axis of the rotating shaft. The first linkage member is in the second guide groove and can move along the second guide groove.

2. The adjustable cam speed device according to claim 1, characterized in that: The distance between the first linkage member and the axis of the power output shaft is greater than the distance between the second linkage member and the axis of the rotating shaft.

3. The adjustable cam speed device according to claim 1, characterized in that: The first guide groove and the second guide groove extend in opposite directions.

4. The adjustable cam speed device according to claim 3, characterized in that: The position adjustment mechanism includes at least one adjustment rod and at least two guide rods. The frame is provided with at least one guide hole. The number of guide holes is the same as that of the adjustment rods and they correspond one to one. The adjustment rod is fixedly mounted on the mounting seat. The adjustment rod extends out of the frame and is located in the guide hole. The guide rods are fixedly mounted on the frame and arranged in the left and right directions. The guide rods are parallel to each other and perpendicular to the adjustment rods. The mounting seat is mounted on the guide rods so as to be movable left and right.

5. The adjustable cam speed device according to claim 1, characterized in that: A first bearing is provided on the first linkage member, the inner ring of the first bearing is connected to the first linkage member, and the outer ring of the first bearing is in contact with the second guide groove; a second bearing is provided on the second linkage member, the inner ring of the second bearing is connected to the second linkage member, and the outer ring of the second bearing is in contact with the first guide groove.

6. The adjustable cam speed device according to claim 1, characterized in that: The eccentric speed regulating mechanism further includes a third bearing, which is sleeved on the rotating shaft, and the inner ring of the third bearing is connected to the rotating shaft, and the outer ring of the third bearing is connected to the mounting seat.

Images