Strip caching mechanism and strip feeding device

Abstract

The utility model discloses a strip caching mechanism and a strip feeding device, and belongs to the technical field of photovoltaic cell assembly production. Wherein the buffer wheel is installed on the guide assembly and can move up and down along the guide assembly, and a strip released by the unwinding mechanism bypasses the buffer wheel and then is clamped by the traction mechanism. The pull-down assembly is in transmission connection with the buffer wheel and used for providing pull-down force for the buffer wheel in the up-down moving process of the buffer wheel. According to the strip buffering mechanism, in the process that the buffering wheel moves up and down along the guide assembly, the downward pulling force is provided for the buffering wheel through the downward pulling assembly, and therefore no matter how the traction speed of the traction mechanism changes, the buffering wheel can effectively pull and tension the strip downwards; by arranging the pull-down assembly, the buffer wheel is prevented from jumping when the speed of the traction mechanism changes, and it is guaranteed that the tension of the strip is controllable.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cell assembly production, in particular to a strip buffer mechanism and a strip feeding device. Background Art

[0002] In the production process of photovoltaic modules, the feeding of strips such as welding strips or bus bars is often involved. The strip feeding mechanism usually includes a reeling mechanism and a traction mechanism. The reeling mechanism unwinds the strip material roll through the reeling motor, and the unwound strip is clamped and pulled to the specified position by the traction mechanism. In order to avoid the strip being too tight or too loose due to the mismatch between the traction speed of the traction mechanism and the unwinding speed of the unwinding motor, a strip buffer mechanism is usually set between the reeling mechanism and the traction mechanism.

[0003] The existing strip caching mechanism mainly includes a vertical slide rail and a counterweight wheel. The counterweight wheel can be installed on the vertical slide rail to slide up and down, and the strip passes around the counterweight wheel. When the traction speed of the traction motor does not match the unwinding speed of the unwinding motor, the counterweight wheel can move up and down along the vertical slide rail under the action of its own gravity to adjust the tension of the strip. However, since the traction speed of the strip is relatively fast during the strip preparation process, each time the traction stops, the counterweight wheel is prone to jumping due to the sudden change in speed, resulting in uncontrollable tension of the strip. Utility Model Content

[0004] In view of the problem that when a counterweight wheel is used to cache the strip, the strip tension may be uncontrollable due to the bouncing of the counterweight wheel, the utility model provides a strip cache mechanism, and the specific solution is as follows:

[0005] The strip buffer mechanism is arranged between the unwinding mechanism and the traction mechanism; the strip buffer mechanism comprises a buffer wheel, a guide assembly and a pull-down assembly, wherein:

[0006] The buffer wheel is installed on the guide assembly, and the buffer wheel can move up and down along the guide assembly. The strip released by the unwinding mechanism passes around the buffer wheel and is clamped by the traction mechanism;

[0007] The pull-down assembly is in transmission connection with the buffer wheel, and is used for providing a pull-down force to the buffer wheel during the process of the buffer wheel moving up and down.

[0008] The strip cache mechanism of the present application provides a downward pulling force to the buffer wheel through the pull-down assembly during the process of the buffer wheel moving up and down along the guide assembly, so that no matter how the traction speed of the traction mechanism changes, the buffer wheel can effectively pull downward and tension the strip. The setting of the pull-down assembly avoids the buffer wheel from jumping when the speed of the traction mechanism changes, thereby ensuring that the tension of the strip is controllable.

[0009] In some embodiments, the guide assembly includes a fixed portion and a movable portion, wherein: the movable portion is mounted on the fixed portion movably up and down; the buffer wheel is rotatably mounted on the movable portion, and the movable portion is connected to the pull-down assembly.

[0010] The buffer wheel is installed on the movable part, and the movable part is connected with the pull-down assembly, so that the buffer wheel moves up and down on the fixed part with the movable part through the pull-down assembly, so that the strip wound around the buffer wheel maintains a certain tension.

[0011] In some embodiments, the pull-down assembly includes a cylinder and a pressure reducing valve, wherein: the buffer wheel is drivingly connected to the piston rod of the cylinder; the cylinder is provided with an inlet and outlet air joint connected to the cylinder cavity; the pressure reducing valve is provided with a first joint and a second joint, the first joint is connected to an external air source, and the second joint is connected to the inlet and outlet air joints; the external air source inflates the cylinder cavity through the pressure reducing valve so that the cylinder pulls down the buffer wheel.

[0012] By connecting the pressure reducing valve to the cylinder, the gas pressure entering the cylinder cavity can be adjusted so that the cylinder pulls the buffer wheel with a suitable downward pulling force.

[0013] In some embodiments, the pressure reducing valve is a reverse flow pressure reducing valve, which is also used to exhaust the air in the cylinder cavity when the buffer wheel drives the piston rod of the cylinder to move upward, so as to keep the pressure in the cylinder cavity constant.

[0014] When the buffer wheel moves upward and drives the piston rod of the cylinder to move upward, the air in the cylinder cavity will be compressed to increase the air pressure in the cylinder cavity. By connecting the backflow pressure reducing valve to the cylinder, the backflow pressure reducing valve can automatically exhaust the air in the cylinder cavity through the inlet and outlet air joints, so that the air pressure in the cylinder cavity is maintained at a constant value, thereby providing a constant downward pulling force to the buffer wheel, so that the strip maintains a certain tension.

[0015] In some embodiments, the pull-down assembly includes an upper mounting member, a spring and a lower mounting member, the lower mounting member is fixedly arranged, the upper mounting member is configured to move with the buffer wheel, the lower end of the spring is connected to the lower mounting member, the upper end of the spring is connected to the upper mounting member, and the spring is used to pull down the buffer wheel.

[0016] The spring is installed between the upper mounting member and the lower mounting member, and the upper mounting member moves with the buffer wheel, and the lower mounting member is fixedly arranged, so that the spring provides a downward pulling force to the buffer wheel, thereby keeping a certain tension of the strip.

[0017] In some embodiments, the pulling force provided by the pulling assembly to the buffer wheel is smaller than the pulling force of the pulling mechanism.

[0018] The pull-down force provided to the buffer wheel by the pull-down assembly is smaller than the traction force, so that the buffer wheel can move up and down along the guide assembly, thereby caching the strip.

[0019] In some embodiments, the pull-down force provided by the pull-down assembly to the buffer wheel is a constant pull-down force or a non-constant pull-down force.

[0020] The constant downward pulling force or the non-constant downward pulling force provided to the buffer wheel by the downward pulling component can make the buffer wheel effectively pull downward and tension the belt.

[0021] In some embodiments, a trigger element is provided on the movable part, and a lower sensor used in conjunction with the trigger element is provided near the lower end of the fixed part, and the lower sensor is electrically connected to the control element of the unwinding mechanism; when the trigger element moves downward with the buffer wheel and triggers the lower sensor, the control element controls the unwinding mechanism to stop unwinding.

[0022] By arranging a trigger element on the movable part and a lower position sensor matched with the trigger element at the lower end near the fixed part, the low position detection of the buffer wheel can be realized. When the buffer wheel moves down to the set low position, the trigger element triggers the lower position sensor, and the control element controls the unwinding mechanism to stop unwinding, thereby ensuring that the tension of the strip is controllable.

[0023] In some embodiments, the trigger element includes a long rod portion, wherein: the long rod portion is extended downward, the upper end of the long rod portion is connected to the movable portion, and during the downward movement of the buffer wheel, the long rod portion can trigger the lower sensor from bottom to top, and starting from the lower end of the long rod portion triggering the lower sensor, the control element controls the unwinding mechanism to stop unwinding.

[0024] By triggering the lower sensor from bottom to top through the long rod, the lower end of the long rod can stop the unwinding motor of the unwinding mechanism starting from triggering the lower sensor, and the unwinding motor remains stopped during the entire triggering process of the long rod. Even if the unwinding motor still overshoots right after it stops, the buffer wheel can still descend to cache the strip released during the overshoot until the entire long rod completes the triggering of the lower sensor, thereby ensuring that the tension of the strip is controllable.

[0025] In some embodiments, the strip caching mechanism also includes a first guide wheel and a second guide wheel, wherein: the first guide wheel and the second guide wheel are respectively arranged on both sides of the buffer wheel and located above the buffer wheel; the strip released by the unwinding mechanism passes around the first guide wheel, the buffer wheel and the second guide wheel in turn and is clamped by the traction mechanism.

[0026] By providing the first guide wheel and the second guide wheel, the strip can be smoothly buffered in cooperation with the buffer wheel.

[0027] The present application also provides a strip feeding device, including the strip buffer mechanism shown above.

[0028] The strip feeding device of the present application, by adopting the above-mentioned strip buffer mechanism, can ensure that the tension of the strip is controllable during the feeding process.

[0029] In some embodiments, the strip feeding device also includes a unwinding mechanism and a pressing mechanism, a cutting mechanism and a traction mechanism arranged in sequence, wherein: the unwinding mechanism is used to release the strip from the roll; the strip passes through the strip buffering mechanism, the pressing mechanism and the cutting mechanism in sequence and is then clamped and pulled by the traction mechanism; the strip buffering mechanism is used to buffer the strip; the pressing mechanism is used to press the strip; and the cutting mechanism is used to cut the strip.

[0030] By cooperating with the unwinding mechanism, the pressing mechanism, the cutting mechanism and the pulling mechanism which are arranged in sequence, a strip of a required length can be automatically prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of the strip feeding device in this application;

[0032] Figure 2 This is a schematic diagram of the structure of the stripe cache mechanism in Example 1 of the present application;

[0033] Figure 3 This is a schematic diagram of the structure of the stripe cache mechanism in Example 2 of the present application;

[0034] Figure 4 for Figure 3 A is an enlarged view of the middle image.

[0035] Reference numerals;

[0036] 1. Unwinding mechanism;

[0037] 2. Stripe cache mechanism;

[0038] 21. Buffer wheel;

[0039] 22. guide assembly; 221. fixed portion; 222. movable portion;

[0040] 23. Pull-down assembly; 231. Cylinder; 232. Inlet and outlet joints; 233. Pressure reducing valve; 234. First joint; 235. Second joint; 236. Upper mounting member; 237. Lower mounting member; 238. Spring;

[0041] 241. First guide wheel; 242. Second guide wheel; 25. Lower sensor; 26. Trigger element; 261. Long rod. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figure 1 and 2As shown, the strip buffer mechanism 2 in the present application is arranged between the unwinding mechanism 1 and the traction mechanism ( Figure 1 The strip buffer mechanism 2 includes a buffer wheel 21, a guide assembly 22 and a pull-down assembly 23, wherein:

[0044] The buffer wheel 21 is installed on the guide assembly 22. The buffer wheel 21 can move up and down along the guide assembly 22. The strip released by the unwinding mechanism 1 passes around the buffer wheel 21 and is clamped by the traction mechanism.

[0045] The pull-down assembly 23 is in transmission connection with the buffer wheel 21 , and the pull-down assembly 23 is used to provide a pull-down force to the buffer wheel 21 during the process of the buffer wheel 21 moving up and down.

[0046] The strip cache mechanism 2 of the present application provides a downward pulling force to the buffer wheel 21 through the pull-down component 23 during the process of the buffer wheel 21 moving up and down along the guide component 22, so that no matter how the traction speed of the traction mechanism changes, the buffer wheel 21 can effectively pull downward and tension the strip. The setting of the pull-down component 23 avoids the buffer wheel 21 from jumping when the speed of the traction mechanism changes, thereby ensuring that the tension of the strip is controllable.

[0047] In the present application, the downward pulling force provided by the pull-down assembly 23 to the buffer wheel 21 is less than the pulling force of the traction mechanism, so that when the traction mechanism pulls the strip, it can overcome the downward pulling force of the pull-down assembly and drive the buffer wheel 21 to move upward. When the traction mechanism stops pulling, the pull-down assembly can also pull the buffer wheel downward to achieve the buffering of the strip. The downward pulling force provided by the pull-down assembly 23 to the buffer wheel 21 is a constant downward pulling force or a non-constant downward pulling force, as long as it can effectively pull the buffer wheel 21 downward and tension the strip.

[0048] Continue to refer Figure 2 The guide assembly 22 includes a fixed portion 221 and a movable portion 222 , wherein: the movable portion 222 is mounted on the fixed portion 221 movably up and down; the buffer wheel 21 is rotatably mounted on the movable portion 222 , and the movable portion 222 is connected to the pull-down assembly 23 .

[0049] In this way, the buffer wheel 21 is installed on the movable part 222, and the movable part 222 is connected to the pull-down assembly 23, so that the buffer wheel 21 moves up and down on the fixed part 221 with the movable part 222 through the pull-down assembly 23, so that the strip wrapped around the buffer wheel 21 maintains a certain tension.

[0050] Optionally, the movable portion 222 and the fixed portion 221 in the guide assembly 22 may be any of the following:

[0051] Mode 1: The fixed portion 221 is a vertically arranged slide rail, and the movable portion 222 is a slider slidably mounted on the slide rail.

[0052] Mode 2: The fixed portion 221 is a vertically arranged guide rail, and the movable portion 222 is a roller matched with the guide rail.

[0053] Mode 3: The fixed portion 221 is a vertical guide groove, and the movable portion 222 is a guide sliding block arranged in the vertical guide groove.

[0054] Mode 4: The fixed portion 221 is a guide post, and the movable portion 222 is a guide sleeve slidably sleeved on the guide post.

[0055] It should be noted that the guide assembly 22 includes but is not limited to the above-mentioned structure, as long as it can make the buffer wheel 21 rotatably mounted on the movable part 222 move up and down along the fixed part 221 .

[0056] Figure 2 and Figure 3 They are respectively Embodiment 1 and Embodiment 2 of the stripe cache mechanism of the present application, and the difference between the two embodiments lies in the different structures of the pull-down component 23 .

[0057] Optional, continue to refer to Figure 2 The pull-down assembly 23 in Example 1 includes a cylinder 231 and a pressure reducing valve 233, wherein: the buffer wheel 21 is drivingly connected to the piston rod of the cylinder 231; the cylinder 231 is provided with an inlet and outlet air joint 232 connected to the cylinder cavity; the pressure reducing valve 233 is provided with a first joint 234 and a second joint 235, the first joint 234 is connected to an external air source, and the second joint 235 is connected to the inlet and outlet air joint 232; the external air source inflates the cylinder cavity through the pressure reducing valve 233, so that the cylinder 231 pulls down the buffer wheel 21.

[0058] The pressure reducing valve 233 can be a conventional pressure reducing valve without a backflow function. In this case, optionally, the cylinder 231 adopts a low-friction cylinder. When the piston rod of the cylinder 231 moves upward together with the buffer wheel 21 and compresses the gas in the cylinder cavity, the low-friction cylinder 231 can automatically exhaust the cylinder cavity, thereby avoiding excessive pressure in the cylinder cavity and ensuring the reliability of the cylinder.

[0059] Optionally, the pressure reducing valve 233 is a reverse flow pressure reducing valve, which is also used to exhaust the air in the cylinder cavity when the buffer wheel 21 drives the piston rod of the cylinder 231 to move upward, so as to keep the pressure in the cylinder cavity constant.

[0060] When the buffer wheel 21 moves upward and drives the piston rod of the cylinder 231 to move upward together, the air in the cylinder cavity will be compressed to increase the air pressure in the cylinder cavity. By connecting the reverse flow pressure reducing valve on the cylinder 231, the reverse flow pressure reducing valve can automatically exhaust the air in the cylinder cavity through the inlet and outlet air joints 232, so that the air pressure in the cylinder cavity is maintained at a constant value, thereby providing a constant downward pulling force to the buffer wheel 21, so that the strip maintains a certain tension.

[0061] Optional, such as Figure 3 As shown, the pull-down assembly 23 in Example 2 includes an upper mounting member 236, a spring 238 and a lower mounting member 237. The lower mounting member 237 is fixedly arranged, and the upper mounting member 236 is configured to move with the buffer wheel 21. For example, the upper mounting member 236 is installed on the movable part 222 of the guide assembly 22, the lower end of the spring 238 is connected to the lower mounting member 237, and the upper end of the spring 238 is connected to the upper mounting member 236. The spring 238 is used to pull down the buffer wheel 21.

[0062] By installing the spring 238 between the upper mounting member 236 and the lower mounting member 237, and the upper mounting member 236 moves with the buffer wheel 21, and the lower mounting member 237 is fixed, the spring 238 provides a downward pulling force to the buffer wheel 21, so that the strip maintains a certain tension.

[0063] The spring 238 may be a tension spring or a spring balancer.

[0064] Continue to refer Figure 2 and Figure 3 A trigger element 26 is provided on the movable part 222, and a lower sensor 25 used in conjunction with the trigger element 26 is provided near the lower end of the fixed part 221. The lower sensor 25 is electrically connected to the control element of the unwinding mechanism 1; when the trigger element 26 moves downward with the buffer wheel 21 and triggers the lower sensor 25, the control element controls the unwinding mechanism 1 to stop unwinding.

[0065] When the buffer wheel 21 installed on the movable part 222 moves downward, it drives the touch element to pass and trigger the lower sensor 25, so that the lower sensor 25 transmits a signal to the control element, thereby controlling the unwinding mechanism 1 to stop unwinding, ensuring that the tension of the strip is controllable.

[0066] Furthermore, the trigger element 26 includes a long rod portion 261, wherein: the long rod portion 261 is extended downward, and the upper end of the long rod portion 261 is connected to the movable portion 222. During the downward movement of the buffer wheel 21, the long rod portion 261 can trigger the lower sensor 25 from bottom to top, and starting from the lower end of the long rod portion 261 triggering the lower sensor 25, the control element controls the unwinding mechanism 1 to stop unwinding.

[0067] It can be seen that when the long rod 261 triggers the lower sensor 25 from bottom to top, the lower end of the long rod 261 starts to trigger the lower sensor 25, and the unwinding motor of the unwinding mechanism 1 can stop, and the unwinding motor remains stopped during the entire triggering process of the long rod 261. Even if the unwinding motor still overshoots right after it stops, the buffer wheel 21 can still descend to cache the strip released during the overshoot process until the entire long rod 261 completes the triggering of the lower sensor 25, thereby ensuring that the tension of the strip is controllable.

[0068] refer to Figure 1 Optionally, the present application also includes a first guide wheel 241 and a second guide wheel 242, wherein: the first guide wheel 241 and the second guide wheel 242 are respectively arranged on both sides of the buffer wheel 21 and are located above the buffer wheel 21; the strip released by the unwinding mechanism 1 successively passes around the first guide wheel 241, the buffer wheel 21 and the second guide wheel 242 and is clamped by the traction mechanism.

[0069] The first guide wheel 241 and the second guide wheel 242 can cooperate with the buffer wheel 21 to achieve smooth caching of the strip.

[0070] The present application also provides a strip feeding device, comprising a reeling mechanism 1, a strip buffering mechanism 2 (which can be any one of Examples 1 and 2), a pressing mechanism, a cutting mechanism and a traction mechanism, which are arranged in sequence, wherein: the reeling mechanism 1 is used to release the strip from the roll; the strip passes through the strip buffering mechanism 2, the pressing mechanism and the cutting mechanism in sequence and is clamped and pulled by the traction mechanism; the strip buffering mechanism 2 is used to cache the strip; the pressing mechanism is used to press the strip; the cutting mechanism is used to cut the strip, which can provide the photovoltaic cell module with the required strip length during the production process.

[0071] The present application adopts any one of the strip buffer mechanisms 2 in Example 1 or Example 2, which can ensure that the strip maintains a certain tension during the loading process, and can avoid the buffer wheel 21 from jumping when the traction speed changes suddenly, thereby increasing the stability of strip loading.

[0072] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A stripe cache mechanism, characterized in that: The strip buffer mechanism is arranged between the unwinding mechanism and the traction mechanism; the strip buffer mechanism comprises a buffer wheel, a guide assembly and a pull-down assembly, wherein: The buffer wheel is installed on the guide assembly, and the buffer wheel can move up and down along the guide assembly. The strip released by the unwinding mechanism passes around the buffer wheel and is clamped by the traction mechanism; The pull-down assembly is in transmission connection with the buffer wheel, and the pull-down assembly is used for providing a pull-down force to the buffer wheel during the process of the buffer wheel moving up and down.

2. The stripe cache mechanism according to claim 1, characterized in that: The guide assembly comprises a fixed part and a movable part, wherein: The movable part is mounted on the fixed part so as to be movable up and down; The buffer wheel is rotatably mounted on the movable part, and the movable part is connected to the pull-down assembly.

3. The stripe cache mechanism according to claim 1, characterized in that: The pull-down assembly comprises a cylinder and a pressure reducing valve, wherein: The buffer wheel is drivingly connected to the piston rod of the cylinder; The cylinder is provided with an inlet and outlet gas joint connected with the cylinder cavity; The pressure reducing valve is provided with a first joint and a second joint, the first joint is connected to an external gas source, and the second joint is connected to the gas inlet and outlet joints; The external air source inflates air into the cylinder cavity through the pressure reducing valve, so that the cylinder pulls down the buffer wheel.

4. The stripe cache mechanism according to claim 3, characterized in that: The pressure reducing valve is a reverse flow pressure reducing valve, and the reverse flow pressure reducing valve is also used to exhaust the cylinder cavity when the buffer wheel drives the piston rod of the cylinder to move upward, so as to keep the pressure in the cylinder cavity constant.

5. The stripe cache mechanism according to claim 1, characterized in that: The pull-down assembly includes an upper mounting member, a spring and a lower mounting member, wherein the lower mounting member is fixedly arranged, and the upper mounting member is configured to move with the buffer wheel, the lower end of the spring is connected to the lower mounting member, and the upper end of the spring is connected to the upper mounting member, and the spring is used to pull down the buffer wheel.

6. The stripe cache mechanism according to claim 1, characterized in that: The pulling force provided by the pulling assembly to the buffer wheel is smaller than the pulling force of the pulling mechanism.

7. The stripe cache mechanism according to claim 1, characterized in that: The pull-down force provided by the pull-down component to the buffer wheel is a constant pull-down force or a non-constant pull-down force.

8. The stripe cache mechanism according to claim 2, characterized in that: A trigger element is provided on the movable part, and a lower sensor used in conjunction with the trigger element is provided near the lower end of the fixed part, and the lower sensor is electrically connected to the control element of the unwinding mechanism; When the trigger element moves downward following the buffer wheel and triggers the lower sensor, the control element controls the unwinding mechanism to stop unwinding.

9. The stripe cache mechanism according to claim 8, characterized in that: The trigger element comprises a long rod, wherein: The long rod portion is extended downward, and the upper end of the long rod portion is connected to the movable portion. During the downward movement of the buffer wheel, the long rod portion can trigger the lower sensor from bottom to top, and starting from the lower end of the long rod portion triggering the lower sensor, the control element controls the unwinding mechanism to stop unwinding.

10. The stripe cache mechanism according to claim 1, characterized in that: The stripe caching mechanism further comprises a first guide wheel and a second guide wheel, wherein: The first guide wheel and the second guide wheel are respectively arranged on both sides of the buffer wheel and located above the buffer wheel; The strip released by the unwinding mechanism passes around the first guide wheel, the buffer wheel and the second guide wheel in sequence and is clamped by the traction mechanism.

11. A strip feeding device, characterized in that: The strip feeding device comprises the strip caching mechanism as described in any one of claims 1 to 10.

12. The strip feeding device according to claim 11, characterized in that: The strip feeding device also includes an unwinding mechanism and a pressing mechanism, a cutting mechanism and a pulling mechanism which are arranged in sequence, wherein: The unwinding mechanism is used to unwind the strip from the roll; The strip is clamped and pulled by the pulling mechanism after passing through the strip buffer mechanism, the pressing mechanism and the cutting mechanism in sequence; The stripe cache mechanism is used to cache the stripes; The pressing mechanism is used to press the strip; The cutting mechanism is used to cut the strip.

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