Side mounted double saw car synchronous transmission device
By arranging a side synchronous machine on the outside of the sawing machine base and using the forward and reverse alternating rotation of the power shaft to drive the double saw car, the safety hazard caused by the cooling water in the central synchronous transmission device is solved, and the safe and reliable operation of the double saw car is achieved.
Patent Information
- Application Number
- CN202310070503.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-06
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2043-02-06
AI Technical Summary
In existing high-speed double-saw cutting machines, the motor of the centrally mounted synchronous transmission device has a potential safety hazard due to cooling water entering the cooling system, and the danger caused by the cooling water cannot be effectively avoided.
A side-mounted double-saw car synchronous transmission device is adopted. By setting a side synchronous machine on the outside of the extended direction of the saw machine base, the two transmission devices are driven by the positive and negative alternating rotation of the power shaft, avoiding the influence of cooling water and realizing the synchronous movement of the double-saw cars.
It effectively avoids the damage of cooling water to the motor and improves the safety and reliability of the equipment.
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Figure CN115971568B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of high-speed fixed-length cutting of continuous bar materials in an automated production line, and in particular to a side-mounted double-saw car synchronous transmission device for a double-saw car high-speed fixed-length cutting machine. Background Art
[0002] In today's high-frequency welded pipe production line technology field, high-speed and ultra-high-speed continuous welded pipe production lines are appearing more and more frequently. With the development of technology, the requirements for the cutting technology of continuous pipe materials are becoming higher and higher, and the resulting high-speed double-saw cutting machine is gradually taking shape. The existing high-speed double-saw car cutting machine adopts a center-mounted synchronous transmission device to drive the two saw cars of the double-saw car to move synchronously and alternately. The motor arranged in the center-mounted synchronous transmission device is structurally placed just below the continuous tubular material that needs to be cut. The continuous tubular material will be sprayed with a large amount of water for cooling during the production process. Then, when these water passes through the motor in the center-mounted synchronous transmission device, some of the water will enter the cooling system of the motor, thereby posing a great safety hazard. Even if certain protective measures are adopted, a large amount of cooling water will produce a certain amount of water mist, and the cooling system of the motor just needs a fan for air cooling. The air-cooling fan will more or less bring water mist into the cooling system of the motor. Therefore, the protective measures cannot fundamentally solve the danger brought by cooling water to the motor in the center-mounted synchronous transmission device to a certain extent. Therefore, in order to solve the above problems, technical personnel in this field have developed a side-mounted double-saw car synchronous transmission device that can avoid the hazards brought by cooling water. It has become an inevitable trend. Summary of the Invention
[0003] This embodiment provides a side-mounted double-saw car synchronous transmission device that can avoid the harm caused by cooling water in actual production. A side synchronous machine is arranged on the outside of the direction in which the two transmission devices drive the two saw cars to reciprocate along the extension direction of the sawing machine base. The power shaft extending outward from the side synchronous machine synchronously drives the two transmission devices to move through forward and reverse alternating rotation to realize the operation of the double saw car. Since the side synchronous machine is arranged away from the continuous tubular material that needs to be cut, the harm caused by cooling water can be essentially solved.
[0004] Specifically, the side-mounted double saw car synchronous transmission device is used to drive the forward and reverse synchronous double saw turning and milling saw machine to work and stay away from the water mist caused by the cooling system. It includes a first transmission part p1 and a second transmission part p2. The double saw turning and milling saw machine is also provided with a first saw car j1 and a second saw car j2. The first saw car j1 is fixed on the first transmission part p1, and the second saw car j2 is fixed on the second transmission part p2. The first transmission part p1 and the second transmission part p2 are both arranged on the fixed seat gd and reciprocate along the extension direction of the fixed seat gd. It is characterized in that it is also provided with a side-mounted double saw car synchronous transmission device. Synchronous machine cj, the side-mounted synchronous machine cj is also provided with a power shaft cd, the first transmission part p1 and the second transmission part p2 are both connected to the power shaft cd for mutual transmission, and the power shaft cd can drive the first transmission part p1 and the second transmission part p2 to alternately reciprocate by alternating forward and reverse rotation. The side-mounted synchronous machine cj is arranged on the side of the fixed seat gd through the extension of the power shaft cd to stay away from water mist, and the axial extension direction of the power shaft cd is perpendicular to the direction of reciprocating movement of the first transmission part p1 and the second transmission part p2 along the extension direction of the fixed seat gd.
[0005] According to one aspect of the specific implementation of the embodiment of the present invention, the power shaft cd is also provided with a first transmission shaft cd1 and a second transmission shaft cd2, the first transmission part p1 is connected to the first transmission shaft cd1, and the second transmission part p2 is connected to the second transmission shaft cd2, and the first transmission shaft cd1 and the second transmission shaft cd2 are arranged parallel to each other on the same side of the first transmission part p1 and the second transmission part p2.
[0006] According to one aspect of a specific implementation of an embodiment of the present invention, a first synchronous belt c1 and a first driving pulley cz1 are provided on the first transmission part p1, and a second synchronous belt c2 and a second driving pulley cz2 are provided on the second transmission part p2. The first driving pulley cz1 and the first transmission shaft cd1 are connected to each other through a coupling, and the second driving pulley cz2 and the second transmission shaft cd2 are connected to each other through a coupling.
[0007] According to one aspect of the specific implementation of the embodiment of the present invention, the side-mounted synchronous machine cj is also provided with a first gear cc1 and a second gear cc2. The first gear cc1 and the second gear cc2 can engage with each other and have the same number of teeth. The first gear cc1 is installed on the first transmission shaft cd1, and the second gear cc2 is installed on the second transmission shaft cd2. When the first gear cc1 and the second gear cc2 engage with each other for transmission, the speed is the same and the rotation direction is opposite.
[0008] According to one aspect of a specific implementation of an embodiment of the present invention, a motor dd is further provided. The motor dd is axially coupled to the first transmission shaft cd1 or the second transmission shaft cd2 and is disposed on opposite sides of the first driving wheel cz1 and the second driving wheel cz2.
[0009] According to one aspect of a specific implementation of an embodiment of the present invention, a first driven wheel cs1 is further provided in the first synchronous belt c1, and the first driving wheel cz1 and the first driven wheel cs1 are both arranged on a fixed seat gd. The first synchronous belt c1 can rotate under the support of the first driving wheel cz1 and the first driven wheel cs1.
[0010] According to one aspect of the specific implementation of the embodiment of the present invention, a second driven wheel cs2 is also provided in the second synchronous belt c2, and the second driving wheel cz2 and the second driven wheel cs2 are both arranged on the fixed seat gd, and the second synchronous belt c2 can rotate under the support of the second driving wheel cz2 and the second driven wheel cs2.
[0011] According to one aspect of a specific implementation of the embodiment of the present invention, the extension directions of the first synchronous belt c1 and the second synchronous belt c2 are both arranged along the length direction of the fixing seat gd, and the first synchronous belt c1 and the second synchronous belt c2 are parallel to each other in the extension direction. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013] Explanation of the serial numbers: power shaft cd, first transmission part p1, first synchronous belt c1, first driving wheel cz1, first transmission shaft cd1, first driven wheel cs1, second transmission part p2, second synchronous belt c2, second driving wheel cz2, second transmission shaft cd2, second driven wheel cs2, first saw car j1, second saw car j2, fixed base gd, side synchronous machine cj, first gear cc1, second gear cc2, box xt, motor dd, continuous material w, first rack t1, first transmission gear cp1, second rack t2, second transmission gear cp2.
[0014] Figure 1 It is a schematic diagram of the basic structure of the overall layout of embodiment 1 of the present invention.
[0015] Figure 2 This is a schematic diagram of the alternation of the first saw carriage j1 and the second saw carriage j2 in accordance with the first embodiment of the present invention.
[0016] Figure 3 1 is a front view schematic diagram of the layout of the first synchronous belt c1 according to the first embodiment of the present invention.
[0017] Figure 4 It is a schematic cross-sectional view of a side-mounted synchronous machine cj according to an embodiment of the present invention.
[0018] Figure 5 It is a schematic diagram of another implementation of a side-mounted synchronous machine cj according to an embodiment of the present invention.
[0019] Figure 6 It is a schematic diagram of the basic structure of the overall layout of embodiment 2 of the present invention.
[0020] Figure 7 2 is a front view schematic diagram of the layout of the first rack t1 according to the second embodiment of the present invention.
[0021] Figure 8 It is a schematic diagram of the basic structure of the overall layout of embodiment 3 of the present invention.
[0022] Figure 9 2 is a front view schematic diagram of the layout of the second rack t2 according to the third embodiment of the present invention.
[0023] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily drawn to scale. Implementation Method
[0024] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are intended to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention. That is, the present invention is not limited to the preferred embodiments described, and the scope of the present invention is defined by the claims.
[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified, “perpendicular” and “parallel” do not just have absolute meanings in a mathematical sense, but can be understood as “approximately perpendicular” and “approximately parallel”.
[0026] Figure 1 It is a schematic diagram of the basic structure of the overall layout of embodiment 1 of the present invention.
[0027] Figure 2 This is a schematic diagram of the alternation of the first saw carriage j1 and the second saw carriage j2 in accordance with the first embodiment of the present invention.
[0028] like Figure 1 and Figure 2As shown, this embodiment provides a side-mounted, twin-saw synchronous transmission device that can avoid the hazards posed by cooling water in actual production. This device utilizes a side-mounted synchronous motor positioned outside the two transmission devices, each driving the two saw carriages in reciprocating motion along the extension of the sawing machine base. A power shaft extending outward from the side-mounted synchronous motor synchronously drives the two transmission devices through alternating forward and reverse rotation, achieving dual-saw operation. Because the side-mounted synchronous motor is positioned away from the continuous tubular material to be cut, it can essentially eliminate the hazards posed by cooling water. The specific structure of this technical solution in this embodiment includes a fixed base gd, a first transmission part p1, a second transmission part p2, a first saw carriage j1, and a second saw carriage j2. The fixed base gd is provided with two juxtaposed members. The first transmission part p1 and the second transmission part p2 are both mounted on the fixed base gd. The first saw carriage j1 is fixed to the first transmission part p1, and the second saw carriage j2 is fixed to the second transmission part p2. The first and second saw carriages j1 and j2 are each connected to the fixed base gd via linear slides and can slide freely along the extension of the fixed base gd. The first saw carriage j1 and the second saw carriage j2 slide along the extension direction of the fixed seat gd in parallel with each other. Driven by the first transmission part p1 and the second transmission part p2, the first saw carriage j1 and the second saw carriage j2 can slide along the linear slide rail and perform alternating reciprocating motion with each other.
[0029] Figure 3 1 is a front view schematic diagram of the layout of the first synchronous belt c1 according to the first embodiment of the present invention.
[0030] like Figure 3 As shown, in the first embodiment of the present technical solution, the first transmission part p1 is configured as a first synchronous belt transmission system, the first synchronous belt transmission system is provided with a first synchronous belt c1, the first synchronous belt c1 is also provided with a first driving wheel cz1 and a first driven wheel cs1, the first driving wheel cz1 and the first driven wheel cs1 are both provided with a wheel frame, the first driving wheel cz1 and the first driven wheel cs1 are both fixedly mounted on one of the fixed seats gd through the wheel frame, the first synchronous belt c1 can rotate under the support of the first driving wheel cz1 and the first driven wheel cs1, and when the first driving wheel cz1 rotates, the first synchronous belt c1 can rotate synchronously with it.
[0031] Among them, in the first embodiment of the present technical solution, the second transmission part p2 is configured as a second synchronous belt transmission system, and the second synchronous belt transmission system is provided with a second synchronous belt c2, and the second synchronous belt c2 is also provided with a second driving wheel cz2 and a second driven wheel cs2, and the second driving wheel cz2 and the second driven wheel cs2 are also provided with a wheel frame, and the second driving wheel cz2 and the second driven wheel cs2 are fixedly mounted on another fixed seat gd through the wheel frame, and the second synchronous belt c2 can rotate under the support of the second driving wheel cz2 and the second driven wheel cs2, and when the second driving wheel cz2 rotates, the second synchronous belt c2 can rotate synchronously with it.
[0032] Among them, in the first embodiment of the present technical solution, the extension directions of the first synchronous belt c1 and the second synchronous belt c2 are arranged along the length direction of the fixed seat gd, and the movement trajectory of the first synchronous belt c1 in the extension direction is the same as the movement trajectory of the first saw car j1 along the linear slide rail, and the movement trajectory of the second synchronous belt c2 in the extension direction is the same as the movement trajectory of the second saw car j2 along the linear slide rail, and the movement trajectories of the first synchronous belt c1 and the second synchronous belt c2 in the extension direction are parallel to each other.
[0033] In the first embodiment of the present technical solution, a side-mounted synchronous machine cj is further provided. The side-mounted synchronous machine cj is spatially arranged to the side of two side-by-side fixed seats gd. The side-mounted synchronous machine cj is also provided with a power shaft cd. The power shaft cd further includes a first transmission shaft cd1 and a second transmission shaft cd2. The first driving wheel cz1 and the first transmission shaft cd1 are coupled to each other via a coupling, and the second driving wheel cz2 and the second transmission shaft cd2 are coupled to each other via a coupling. The first transmission shaft cd1 and the second transmission shaft cd2 are arranged parallel to each other on the same side of the first driving wheel cz1 and the second driving wheel cz2.
[0034] Figure 4 It is a schematic cross-sectional view of a side-mounted synchronous machine cj according to an embodiment of the present invention.
[0035] Figure 5 It is a schematic diagram of another implementation of a side-mounted synchronous machine cj according to an embodiment of the present invention.
[0036] like Figure 4 and Figure 5As shown, the side-mounted synchronous machine cj is also provided with a first gear cc1, a second gear cc2 and a box xt. The first gear cc1, the second gear cc2, the first transmission shaft cd1 and the second transmission shaft cd2 are all arranged in the box xt, and the first gear cc1 and the second gear cc2 can mesh with each other and have the same number of teeth. The first gear cc1 is installed on the first transmission shaft cd1, and the second gear cc2 is installed on the second transmission shaft cd2. When the first gear cc1 and the second gear cc2 are meshed with each other and transmitted, they have the same speed and opposite rotation directions. When the first gear cc1 and the second gear cc2 rotate, they can respectively drive the first transmission shaft cd1 and the second transmission shaft cd2 to rotate synchronously.
[0037] In a first embodiment of the present technical solution, a motor dd is further provided, wherein the motor dd is axially coupled to the first transmission shaft cd1 or the second transmission shaft cd2 and is disposed on opposite sides of the first driving wheel cz1 and the second driving wheel cz2. When the motor dd and the first transmission shaft cd1 are axially coupled to each other via a coupling, the motor dd can generate torque and drive the first transmission shaft cd1 to rotate. Simultaneously, the first gear cc1 disposed on the first transmission shaft cd1 can mesh with the second gear cc2 to generate transmission and drive the second transmission shaft cd2 to rotate in a direction opposite to the rotation direction of the first transmission shaft cd1 at the same number of revolutions. When the motor dd and the second transmission shaft cd2 are axially coupled to each other via a coupling, the motor dd can generate torque and drive the second transmission shaft cd2 to rotate. Simultaneously, the second gear cc2 disposed on the second transmission shaft cd2 can mesh with the first gear cc1 to generate transmission and drive the first transmission shaft cd1 to rotate in a direction opposite to the rotation direction of the second transmission shaft cd2 at the same number of revolutions. The rotation of the first transmission shaft cd1 and the second transmission shaft cd2 can respectively drive the first driving wheel cz1 and the second driving wheel cz2 to rotate synchronously, and finally realize the first saw car j1 and the second saw car j2 sliding along the linear slide rail while realizing alternating reciprocating motion with each other.
[0038] Among them, the first saw car j1 and the second saw car j2 are both provided with high-speed saw blades. While the first saw car j1 and the second saw car j2 are alternately reciprocating, they respectively use the high-speed saw blades arranged thereon to cut the continuous material w located between the first saw car j1 and the second saw car j2 and whose feeding direction is parallel to the movement trajectory of the first saw car j1 and the second saw car j2 to a fixed length.
[0039] Figure 6 It is a schematic diagram of the basic structure of the overall layout of embodiment 2 of the present invention.
[0040] Figure 7 2 is a front view schematic diagram of the layout of the first rack t1 according to the second embodiment of the present invention.
[0041] like Figure 6 and Figure 7 As shown, according to one aspect of the specific implementation of the second embodiment of the present invention, its specific distinguishing technical feature from the first embodiment is that the first transmission part p1 is configured as a first rack-and-pinion transmission system, and the first rack-and-pinion transmission system includes a first rack t1 and a first transmission gear cp1, and the first rack t1 and the first transmission gear cp1 are capable of mutually meshing and transmitting. The first transmission gear cp1 is provided with a wheel frame and is fixedly mounted on one of the fixed seats gd. The first rack t1 is fixedly connected to one end of the first saw j1. When the first transmission gear cp1 rotates, the first rack t1 can synchronously drive the first saw j1 to move.
[0042] In a second embodiment of the present technical solution, the second transmission portion p2 is configured as a second rack-and-pinion transmission system, comprising a second rack t2 and a second transmission gear cp2, which are capable of meshing and transmitting with each other. The second transmission gear cp2 is provided with a wheel frame and fixedly mounted on another fixed seat gd. The second rack t2 is fixedly coupled to one end of the second saw carriage j2. When the second transmission gear cp2 rotates, the second rack t2 is driven by the second rack t2 to synchronously drive the second saw carriage j2.
[0043] In a second embodiment of the present technical solution, a side-mounted synchronous machine cj is further provided. The side-mounted synchronous machine cj is spatially arranged to the side of two side-by-side fixed seats gd. The side-mounted synchronous machine cj is further provided with a first transmission shaft cd1 and a second transmission shaft cd2. The first transmission gear cp1 and the first transmission shaft cd1 are coupled to each other via a coupling, and the second transmission gear cp2 and the second transmission shaft cd2 are coupled to each other via a coupling. The first transmission shaft cd1 and the second transmission shaft cd2 are arranged parallel to each other on the same side of the first transmission gear cp1 and the second transmission gear cp2.
[0044] The rotation of the first transmission shaft cd1 and the second transmission shaft cd2 can respectively drive the first transmission gear cp1 and the second transmission gear cp2 to rotate synchronously, and finally realize the first saw car j1 and the second saw car j2 sliding along the linear slide rail while realizing alternating reciprocating motion with each other.
[0045] Figure 8 It is a schematic diagram of the basic structure of the overall layout of embodiment 3 of the present invention.
[0046] Figure 9 2 is a front view schematic diagram of the layout of the second rack t2 according to the third embodiment of the present invention.
[0047] Figure 8 and Figure 9As shown, according to one aspect of the specific implementation of the third embodiment of the present invention, its specific distinguishing technical feature from the second embodiment is that the side-mounted synchronous machine cj is further provided with a power shaft cd, the first transmission gear cp1 and the second transmission gear cp2 are both coaxially connected to the power shaft cd through a coupling, the first rack t1 and the first transmission gear cp1 can mesh with each other for transmission, and the first rack t1 is provided on the upper side of the first transmission gear cp1, the second rack t2 and the second transmission gear cp2 can mesh with each other for transmission, and the second rack t2 is provided on the lower side of the second transmission gear cp2, and the first rack t1 and the second rack t2 are respectively provided on the upper and lower opposite sides of the axial direction of the power shaft cd. The rotation of the power shaft cd can respectively drive the first transmission gear cp1 and the second transmission gear cp2 to rotate synchronously and drive the first rack t1 and the second rack t2 to move synchronously in opposite directions, ultimately achieving the first saw j1 and the second saw j2 sliding along the linear slide rail while achieving alternating reciprocating motion with each other.
[0048] It should be understood that the description of the specific embodiments of the present invention is illustrative and should not be interpreted as an improper limitation on the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims and covers all embodiments and obvious equivalents falling within the scope.
Claims
1. A side-mounted double saw car synchronous transmission device, used to drive a double saw turning and milling saw machine to work in a forward and reverse synchronous manner and away from the influence of water mist caused by a cooling system, comprising a first transmission part (p1) and a second transmission part (p2), wherein the double saw turning and milling saw machine is further provided with a first saw car (j1) and a second saw car (j2), wherein the first saw car (j1) is fixed on the first transmission part (p1), and the second saw car (j2) is fixed on the second transmission part (p2), wherein the first transmission part (p1) and the second transmission part (p2) are both arranged on a fixed seat (gd) and reciprocate along the extension direction of the fixed seat (gd), characterized in that A side synchronous machine (cj) is also provided, and a power shaft (cd) is also provided on the side synchronous machine (cj). The first transmission part (p1) and the second transmission part (p2) are both connected to the power shaft (cd) for mutual transmission. The power shaft (cd) can drive the first transmission part (p1) and the second transmission part (p2) to alternately reciprocate by rotating in a positive and negative direction. The side synchronous machine (cj) is arranged on the side of the fixed seat (gd) through the extension of the power shaft (cd) to avoid water mist. The axial extension direction of the power shaft (cd) is perpendicular to the direction of reciprocating movement of the first transmission part (p1) and the second transmission part (p2) along the extension direction of the fixed seat (gd).
2. The synchronous transmission device of the side-mounted double saw car according to claim 1, characterized in that The power shaft (cd) includes a first transmission shaft (cd1) and a second transmission shaft (cd2), the first transmission part (p1) and the first transmission shaft (cd1) are connected to each other, the second transmission part (p2) and the second transmission shaft (cd2) are connected to each other, and the first transmission shaft (cd1) and the second transmission shaft (cd2) are arranged parallel to each other on the same side of the first transmission part (p1) and the second transmission part (p2).
3. The synchronous transmission device for a side-mounted double saw carriage according to claim 2, characterized in that The first transmission part (p1) includes a first synchronous belt (c1) and a first driving pulley (cz1), and the second transmission part (p2) includes a second synchronous belt (c2) and a second driving pulley (cz2). The first driving pulley (cz1) and the first transmission shaft (cd1) are connected to each other through a coupling, and the second driving pulley (cz2) and the second transmission shaft (cd2) are connected to each other through a coupling.
4. The synchronous transmission device of the side-mounted double saw vehicle according to claim 3, characterized in that The side synchronous machine (cj) is also provided with a first gear (cc1) and a second gear (cc2). The first gear (cc1) and the second gear (cc2) can mesh with each other and have the same number of teeth. The first gear (cc1) is installed on the first transmission shaft (cd1), and the second gear (cc2) is installed on the second transmission shaft (cd2). When the first gear (cc1) and the second gear (cc2) are meshed with each other for transmission, they rotate at the same speed and in opposite directions.
5. The synchronous transmission device of the side-mounted double saw vehicle according to claim 4, characterized in that An electric motor (dd) is also provided. The electric motor (dd) is axially coupled to the first transmission shaft (cd1) or the second transmission shaft (cd2) and is arranged on opposite sides of the first driving wheel (cz1) and the second driving wheel (cz2).
6. The synchronous transmission device of the side-mounted double saw carriage according to claim 5, characterized in that A first driven wheel (cs1) is further provided in the first synchronous belt (c1), and the first driving wheel (cz1) and the first driven wheel (cs1) are both provided on a fixed seat (gd). The first synchronous belt (c1) can rotate under the support of the first driving wheel (cz1) and the first driven wheel (cs1).
7. The synchronous transmission device of the side-mounted double saw vehicle according to claim 6, characterized in that A second driven wheel (cs2) is also provided in the second synchronous belt (c2), and the second driving wheel (cz2) and the second driven wheel (cs2) are both arranged on a fixed seat (gd). The second synchronous belt (c2) can rotate under the support of the second driving wheel (cz2) and the second driven wheel (cs2).
8. The synchronous transmission device of the side-mounted double saw vehicle according to claim 7, characterized in that The extension directions of the first synchronous belt (c1) and the second synchronous belt (c2) are both arranged along the length direction of the fixing seat (gd), and the first synchronous belt (c1) and the second synchronous belt (c2) are parallel to each other in the extension direction.
Citation Information
Patent Citations
Side-mounted double saw synchronous transmission device
CN218799537U