Rotary bobbin grabbing device for electric doffer

Abstract

The invention provides a rotary tube grabbing device for an electric doffer, which comprises a fixing frame, a clamping driving mechanism, a first clamping assembly and a second clamping assembly, and the first clamping assembly and the second clamping assembly are both mounted on the fixing frame; the clamping driving mechanism is used for adjusting the distance between the first clamping assembly and the second clamping assembly. During working, the first clamping assembly and the second clamping assembly clamp a to-be-clamped object and drive the to-be-clamped object to rotate. The rotary bobbin grabbing device for the electric doffing machine can be installed on a machine body of the electric doffing machine, bobbin yarn is collected, and the end leaving rate is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of textile auxiliary equipment, and in particular relates to a rotary tube grabbing device for an electric doffing machine. Background Art

[0002] The tube grabbing device of the traditional ring spinning doffing machine adopts an air bag structure, and the tube grabbing function is realized by the inflation and deflation of the air bag. However, when modifying the spinning frame, it is necessary to add an air source and a wire interface to supply air and electricity to the doffing machine, which increases the modification cost. When the doffing machine is working, it is also necessary to drag a long air pipe and wires, which is inconvenient for the doffing machine to move. Therefore, an electric doffing machine with its own power supply has become a new type of doffing tool. The existing electric doffing machine uses two parallel clamps to clamp the bobbin yarn, and does not have the function of driving the bobbin yarn to rotate, so it is not easy to leave the tail yarn of the bobbin yarn on the spindle rod, and the head retention rate is low. Keeping the tail yarn on the spindle rod is very important for the subsequent winding of the new empty tube. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a rotary tube grabbing device for an electric doffing machine, which can be installed on the body of the electric doffing machine to collect tube yarn and improve the yarn retention rate.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a rotary tube grabbing device for an electric doffing machine, comprising a fixed frame, a clamping drive mechanism, a first clamping assembly and a second clamping assembly, wherein the first clamping assembly and the second clamping assembly are both mounted on the fixed frame; the clamping drive mechanism is used to adjust the distance between the first clamping assembly and the second clamping assembly; when working, the first clamping assembly and the second clamping assembly clamp the object to be clamped and drive the object to be clamped to rotate.

[0005] As a further improvement of an embodiment of the present invention, the first clamping assembly includes a rotation driving mechanism, a first bracket and N first clamping members installed on the first bracket; the first clamping member includes a first clamping wheel, the rotation driving mechanism is fixed on the first bracket, the rotation driving mechanism is connected to the first clamping member, and is used to drive the first clamping wheel to rotate; N represents an integer greater than or equal to 1.

[0006] As a further improvement of an embodiment of the present invention, the second clamping assembly includes a second bracket and N groups of clamping wheel groups installed on the second bracket, each group of clamping wheel groups includes two second clamping wheels; the N groups of clamping wheel groups and the N first clamping wheels are arranged in a one-to-one correspondence, and one group of clamping wheel groups and the corresponding first clamping wheels form a clamping unit.

[0007] As a further improvement of an embodiment of the present invention, the first clamping member also includes a support and a synchronous wheel, the support is fixedly connected to the first bracket, a first rotating shaft is provided on the support, the first clamping wheel and the synchronous wheel are connected to the first rotating shaft, and the first clamping wheel and the synchronous wheel are fixedly connected, and the first clamping wheel can rotate around the axis of the first rotating shaft.

[0008] As a further improvement to the embodiment of the present invention, the first clamping wheel is located between the support and the synchronous wheel, and a cover plate is fixedly provided on a side of the synchronous wheel away from the first clamping wheel.

[0009] As a further improvement of an embodiment of the present invention, the rotation drive mechanism includes a first driving member and a synchronous belt, the first driving member is fixedly mounted on the first bracket, and the synchronous belt is sleeved on the synchronous wheels of all the first clamping members; the synchronous belt is also sleeved on the transmission wheel of the first driving member, or the first driving member is connected to the synchronous wheel of one of the first clamping members; the first driving member drives the synchronous belt and the synchronous wheel to rotate.

[0010] As a further improvement of an embodiment of the present invention, the first clamping assembly is fixedly connected to the fixed frame via a connecting shaft, the second clamping assembly is slidably mounted on the connecting shaft, and is located between the fixed frame and the first clamping assembly; the clamping drive mechanism is fixedly connected to the fixed frame, and the clamping drive mechanism is used to drive the second clamping assembly to move on the connecting shaft.

[0011] As a further improvement of an embodiment of the present invention, the second clamping assembly is fixedly connected to the fixed frame via a connecting shaft, the first clamping assembly is slidably mounted on the connecting shaft, and is located between the fixed frame and the second clamping assembly; the clamping drive mechanism is fixedly connected to the fixed frame, and the clamping drive mechanism is used to drive the first clamping assembly to move on the connecting shaft.

[0012] As a further improvement of an embodiment of the present invention, the clamping drive mechanism includes a second driving member, a second rotating shaft, a cam and a connecting block, the second driving member is fixedly mounted on a fixed frame, the second driving member is connected to the second rotating shaft, and the cam is fixedly arranged on the second rotating shaft; one end of the connecting block is connected to the second bracket of the second clamping assembly, and the other end of the connecting block is provided with a roller, which contacts the cam.

[0013] As a further improvement of an embodiment of the present invention, the clamping drive mechanism includes a second driving member, a second rotating shaft, a cam and a connecting block, the second driving member is fixedly mounted on a fixed frame, the second driving member is connected to the second rotating shaft, and the cam is fixedly arranged on the second rotating shaft; one end of the connecting block is connected to the first bracket of the first clamping assembly, and the other end of the connecting block is provided with a roller, which contacts the cam.

[0014] As a further improvement to the embodiment of the present invention, a spring is sleeved on the connecting shaft, and the spring is located between the first clamping assembly and the second clamping assembly.

[0015] As a further improvement of the embodiment of the present invention, it also includes a hanging member, and the hanging member is fixedly connected to the fixing frame.

[0016] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0017] A rotary tube grabbing device for an electric doffing machine according to an embodiment of the present invention is installed on the body of the electric doffing machine through a fixing frame as a component of the electric doffing machine. The clamping drive mechanism adjusts the distance between the first clamping assembly and the second clamping assembly, and is used to clamp the cop yarn. After the cop yarn is pulled out of the spindle rod, the cop yarn can be driven to rotate, so that the tail line of the cop yarn is thrown onto the spindle rod and wound on the spindle rod, leaving the yarn head and improving the head retention rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 2 is a schematic structural diagram of a rotary tube grabbing device for an electric doffing machine according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of a state in which a group of clamping wheels of the second clamping assembly and the first clamping wheel of the corresponding first clamping assembly clamp the bobbin;

[0020] Figure 3 yes Figure 1 A schematic diagram of the installation structure of the second clamping wheel of the second clamping assembly;

[0021] Figure 4 yes Figure 1 A schematic structural diagram of a first clamping member of a first clamping assembly;

[0022] Figure 5 yes Figure 1 Schematic diagram of the installation structure of the middle clamping drive mechanism and the first clamping assembly.

[0023] The figure includes: a fixed frame 1, a first clamping assembly 2, a first bracket 21, a first clamping wheel 221, a support 222, a synchronous wheel 223, a cover plate 224, a first driving member 231, a synchronous belt 232, a tensioning member 24, a second clamping assembly 3, a second bracket 31, a second clamping wheel 321, a mounting pin 322, a deep groove ball bearing 323, a connecting shaft 4, a spring 5, a second driving member 61, a second rotating shaft 62, a cam 63, a connecting block 64, a roller 65, and a bobbin 7. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0025] The embodiment of the present invention provides a rotary tube grabbing device for an electric doffing machine, such as Figure 1As shown, it includes a fixed frame 1, a clamping drive mechanism, a first clamping assembly 2 and a second clamping assembly 3, and the first clamping assembly 2 and the second clamping assembly 3 are both installed on the fixed frame 1. The first clamping assembly 2 and the second clamping assembly 3 are used to clamp the bobbin, and the clamping drive mechanism is used to adjust the distance between the first clamping assembly 2 and the second clamping assembly 3. When working, the first clamping assembly 2 and the second clamping assembly 3 clamp the object to be clamped (bobbin) and drive the object to be clamped (bobbin) to rotate.

[0026] The rotary tube grabbing device for the electric doffing machine of the embodiment of the present invention is installed on the body of the electric doffing machine through a fixing frame 1, and is used as a component of the electric doffing machine, and uses the power supply of the electric winding machine as a power source. The clamping drive mechanism adjusts the distance between the first clamping component 2 and the second clamping component 3, and is used to clamp the cop 7. After the cop 7 is pulled out of the spindle rod, the cop 7 can be driven to rotate, so that the tail line of the cop 7 is thrown onto the spindle rod and wound on the spindle rod, leaving the yarn head, thereby improving the head retention rate.

[0027] As a preferred example, Figure 1 As shown, the first clamping assembly 2 includes a rotation drive mechanism, a first bracket 21, and N first clamping members installed on the first bracket 21. Wherein, N represents an integer greater than or equal to 1, for example, N = 1, N = 2, N = 3, N = 4, N = 6, N = 8, N = 10 or N = 12. The first clamping member includes a first clamping wheel 221, and the rotation drive mechanism is fixed on the first bracket 21. The rotation drive mechanism is connected to the first clamping member and is used to drive the first clamping wheel 221 to rotate.

[0028] In this preferred embodiment, the first clamping assembly 2 clamps the cop 7 using the first clamping wheel 221, and drives the first clamping wheel 221 to rotate through the rotation driving mechanism, and uses the friction between the first clamping wheel 221 and the cop 7 to drive the cop 7 to rotate, so as to achieve the purpose of throwing the tail line of the cop 7 onto the spindle rod and winding it around the spindle rod, leaving the yarn head, and improving the head retention rate. Preferably, the outer peripheral surface of the first clamping wheel 221 is coated with a rubber pad, which can not only protect the yarn on the cop, but also increase the friction between the first clamping wheel 221 and the cop, enhance the clamping effect and better drive the cop to rotate.

[0029] Preferably, the second clamping assembly 3 includes a second bracket 31 and N groups of clamping wheels installed on the second bracket 31, each group of clamping wheels includes two second clamping wheels 321. Specifically, Figure 3 As shown, the second bracket 31 adopts a U-shaped frame, the second clamping wheel 321 is inserted into the mounting pin 322, and the two ends of the mounting pin 322 are respectively mounted on the two side plates of the U-shaped frame through deep groove ball bearings 323. N groups of clamping wheel groups and N first clamping wheels 221 are arranged one by one, such as Figure 2As shown, a group of clamping wheel groups and the corresponding first clamping wheel 221 form a clamping unit for clamping a cop 7. N groups of clamping wheel groups and N first clamping wheels are provided to form N clamping units, which can clamp N cops at the same time.

[0030] In this preferred embodiment, in each clamping unit, the two second clamping wheels 321 of the second clamping assembly 3 and the first clamping wheel 221 of the first clamping assembly 2 constitute three clamping points, which can stably clamp the cop. Each clamping point clamps the cop through the clamping wheels, and the first clamping wheel 221 rotates to drive the cop 7 to rotate, and the two second clamping wheels 321 also rotate accordingly, which does not increase the resistance to the rotation of the cop 7, so that the cop 7 can be better driven by the first clamping wheel 221 to rotate, and the yarn head is retained.

[0031] Preferably, Figure 4 As shown, the first clamping member also includes a support 222 and a synchronous wheel 223. The support 222 is fixedly connected to the first bracket 21. The support 222 is provided with a first rotating shaft. The first clamping wheel 221 and the synchronous wheel 223 are connected to the first rotating shaft, and the first clamping wheel 221 and the synchronous wheel 223 are fixedly connected. The first clamping wheel 221 can rotate around the axis of the first rotating shaft. There are two specific connection methods. The first one is that the first rotating shaft is rotatably set on the support 222, and the first clamping wheel 221 and the synchronous wheel 223 are fixedly connected to the first rotating shaft. When working, the fixedly connected first clamping wheel 221, the synchronous wheel 223 and the first rotating shaft rotate on the support. The second one is that the first rotating shaft is fixedly set on the support 222, and the first clamping wheel 221 and the synchronous wheel 223 are rotatably set on the first rotating shaft. When working, the first clamping wheel 221 and the synchronous wheel 223 rotate relative to the fixedly connected first rotating shaft and the support 221.

[0032] In this embodiment, the first clamping wheel 221 is installed on the first bracket 21 through the support 222, and the synchronous wheel 223 is fixedly connected to the first clamping wheel 221. The first clamping wheel 221 can be driven to rotate by driving the synchronous wheel 223, and the first clamping wheel 221 can be driven to rotate without affecting the first clamping wheel 221 clamping the tube yarn.

[0033] Preferably, Figure 1As shown, the rotation drive mechanism includes a first driving member 231 and a synchronous belt 232. The first driving member 231 is fixedly mounted on the first bracket 21, and the synchronous belt 232 is sleeved on the synchronous wheels 223 of all the first clamping members. The first driving member 231 is connected to the synchronous wheel 223 of one of the first clamping members, and the first driving member 231 drives the synchronous wheel 223 connected thereto to rotate, thereby driving the synchronous wheels 223 of all the first clamping members to rotate synchronously through the synchronous belt, and then driving the first clamping wheels 221 of all the first clamping members to rotate synchronously, so as to achieve the synchronous rotation of all the clamped bobbins. Alternatively, a transmission wheel is provided on the first driving member 231, and the synchronous belt 232 is sleeved on the transmission wheel. The first driving member 231 drives the transmission wheel to rotate, thereby driving the synchronous wheels 223 of all the first clamping members to rotate synchronously through the synchronous belt, and then driving the first clamping wheels 221 of all the first clamping members to rotate synchronously, so as to achieve the synchronous rotation of all the clamped bobbins. Among them, the first driving member 231 adopts a motor.

[0034] In this preferred embodiment, the synchronous wheels 223 of all the first clamping members are connected by a synchronous belt 232, and the synchronous wheel 223 in each first clamping member is fixedly connected to the first clamping wheel, so that only one first driving member 231 is needed to drive the first clamping wheels of all the first clamping members to rotate, thereby driving all the clamped tube yarns to rotate, thereby improving the tube collection efficiency.

[0035] Preferably, the first clamping wheel 221 is located between the support 222 and the synchronous wheel 223, and a cover plate 224 is fixedly provided on the side of the synchronous wheel 223 away from the first clamping wheel 221. The cover plate 224 is used to prevent the synchronous belt 232 sleeved on the synchronous wheel 223 from detaching from the synchronous wheel 223, thereby ensuring the reliability of the operation of the first clamping wheel 221.

[0036] The clamping drive mechanism of this embodiment is used to adjust the distance between the first clamping assembly 2 and the second clamping assembly 3. In the first structure, the first clamping assembly 2 is movable and the second clamping assembly 3 is fixed; in the second structure, the first clamping assembly 2 is fixed and the second clamping assembly 3 is movable; in the third structure, both the first clamping assembly 2 and the second clamping assembly are movable. Considering the simplicity of the structure, this embodiment preferably adopts the first structure and the second structure.

[0037] In the first structure, specifically, the first clamping assembly 2 is fixedly connected to the fixed frame 1 through the connecting shaft 4, and the second clamping assembly 3 is slidably mounted on the connecting shaft 4 and is located between the fixed frame 1 and the first clamping assembly 2. The clamping drive mechanism is fixedly connected to the fixed frame 1, and the clamping drive mechanism is connected to the second clamping assembly 3. When working, the clamping drive mechanism drives the second clamping assembly 3 to move along the connecting shaft 4 toward the first clamping assembly 2, so that the distance between the first clamping assembly 2 and the second clamping assembly 3 is shortened to clamp the cop 7.

[0038] The second structure, specifically, Figure 1 As shown, the second clamping assembly 3 is fixedly connected to the fixed frame 1 through the connecting shaft 4, and the first clamping assembly 2 is slidably mounted on the connecting shaft 4 and is located between the fixed frame 1 and the second clamping assembly 3. The clamping drive mechanism is fixedly connected to the fixed frame 1, and the clamping drive mechanism is connected to the first clamping assembly 2. When working, the clamping drive mechanism drives the first clamping assembly 2 to move along the connecting shaft 4 toward the second clamping assembly 3, so that the distance between the first clamping assembly 2 and the second clamping assembly 3 is shortened to clamp the cop 7.

[0039] Preferably, Figure 5 As shown, the clamping drive mechanism includes a second driving member 61, a second rotating shaft 62, a cam 63 and a connecting block 64. The second driving member 61 is fixedly mounted on the fixed frame 1, the second driving member 61 is connected to the second rotating shaft 62, and the cam 63 is fixedly arranged on the second rotating shaft 62. One end of the connecting block 64 is connected to the first bracket 21 of the first clamping assembly 2 or the second bracket 31 of the second clamping assembly 3, and the other end of the connecting block 64 is provided with a roller 65, and the roller 65 is in contact with the cam 63. The second driving member 61 can be a motor. When working, the second driving member 61 drives the second rotating shaft 62 to rotate, so that the cam 63 rotates, and the cam 63 applies a thrust to the roller, and pushes the first clamping assembly 2 to move along the connecting shaft 4 toward the second clamping assembly 3 through the connecting block 64, or pushes the second clamping assembly 3 to move along the connecting shaft 4 toward the first clamping assembly 2, thereby shortening the distance between the first clamping assembly 2 and the second clamping assembly 3 to clamp the bobbin.

[0040] In this preferred embodiment, the clamping drive mechanism adopts a cam structure to convert the rotary motion into linear motion, shortening the distance between the first clamping assembly and the second clamping assembly to clamp the bobbin.

[0041] Preferably, a spring 5 is sleeved on the connecting shaft 4, and the spring 5 is located between the first clamping assembly 2 and the second clamping assembly 3. When working, the second driving member works to drive the cam 63 to rotate, and the cam 63 applies a thrust to the roller, and pushes the first clamping assembly to move toward the second clamping assembly, or the second clamping assembly to move toward the first clamping assembly through the connecting block 64. The spring is compressed, and the distance between the first clamping assembly and the second clamping assembly is shortened, thereby clamping the cop. After driving the cop to rotate, the second driving member stops working, and the cam 63 does not generate a thrust on the roller. The spring 5 pushes the first clamping assembly to move away from the second clamping assembly, or the second clamping assembly to move away from the first clamping assembly under the action of the restoring force, and the distance between the first clamping assembly and the second clamping assembly increases, thereby releasing the cop.

[0042] As a preferred example, the rotary pipe grabbing device for the electric doffing machine of this embodiment further comprises a hanging member, which is fixedly connected to the fixing frame 1. The hanging member is used to install the fixing member 1 on the body of the electric doffing machine.

[0043] like Figure 1 The working process of the rotary tube grabbing device for the electric doffing machine in the preferred embodiment shown is as follows:

[0044] After the rotary tube grabbing device of the electric doffing machine moves to the position to be grabbed, the first clamping assembly 2 and the second clamping assembly 3 are located on both sides of a row of cops. The second driving member 61 drives the second rotating shaft 62 to rotate, so that the cam 63 rotates, and the cam 63 applies thrust to the roller, pushing the first clamping assembly 2 to move toward the second clamping assembly 3 along the connecting shaft 4 through the connecting block 64, and the distance between the first clamping assembly 2 and the second clamping assembly 3 is shortened, thereby clamping 10 cops. The rotary tube grabbing device of the electric doffing machine moves upward to pull the cops out of the spindle rod. The first driving member 231 drives the transmission wheel to rotate, thereby driving the synchronous wheels 223 of all the first clamping members to rotate synchronously through the synchronous belt 232, and then driving all the first clamping wheels 221 to rotate synchronously, driving all the clamped cops 7 to rotate synchronously, and throwing the tail line of the cop onto the spindle rod and winding it around the spindle rod, leaving the yarn head, and improving the head retention rate. The second driving member 61 stops working, the cam 63 does not generate thrust on the roller, and the spring 5 pushes the first clamping assembly 2 to move away from the second clamping assembly under the action of the restoring force, and the distance between the first clamping assembly and the second clamping assembly increases, thereby releasing the bobbin.

[0045] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotary tube grabbing device for an electric doffing machine, characterized in that: The invention comprises a fixing frame (1), a clamping drive mechanism, a first clamping assembly (2) and a second clamping assembly (3), wherein the first clamping assembly (2) and the second clamping assembly (3) are both mounted on the fixing frame (1); the clamping drive mechanism is used to adjust the distance between the first clamping assembly (2) and the second clamping assembly (3); when working, the first clamping assembly (2) and the second clamping assembly (3) clamp an object to be clamped and drive the object to be clamped to rotate.

2. The rotary tube grabbing device for an electric doffing machine according to claim 1, characterized in that: The first clamping assembly (2) comprises a rotation drive mechanism, a first bracket (21), and N first clamping members mounted on the first bracket (21); the first clamping member comprises a first clamping wheel (221), the rotation drive mechanism is fixed on the first bracket (21), the rotation drive mechanism is connected to the first clamping member, and is used to drive the first clamping wheel (221) to rotate; N represents an integer greater than or equal to 1.

3. The rotary tube grabbing device for the electric doffing machine according to claim 2 is characterized in that: The second clamping assembly (3) comprises a second bracket (31) and N groups of clamping wheel groups mounted on the second bracket (31), each group of clamping wheel groups comprising two second clamping wheels (321); the N groups of clamping wheel groups and the N first clamping wheels (221) are arranged in one-to-one correspondence, and one group of clamping wheel groups and the corresponding first clamping wheel (221) form a clamping unit.

4. The rotary tube grabbing device for an electric doffing machine according to claim 2, characterized in that: The first clamping member further comprises a support (222) and a synchronous wheel (223); the support (222) is fixedly connected to the first bracket (21); a first rotating shaft is provided on the support (222); the first clamping wheel (221) and the synchronous wheel (223) are connected to the first rotating shaft; the first clamping wheel (221) and the synchronous wheel (223) are fixedly connected; and the first clamping wheel (221) can rotate around the axis of the first rotating shaft.

5. The rotary tube grabbing device for an electric doffing machine according to claim 4, characterized in that: The first clamping wheel (221) is located between the support (222) and the synchronous wheel (223), and a cover plate (224) is fixedly provided on a side of the synchronous wheel (223) away from the first clamping wheel (221).

6. The rotary tube grabbing device for an electric doffing machine according to claim 4, characterized in that: The rotation drive mechanism comprises a first driving member (231) and a synchronous belt (232); the first driving member (231) is fixedly mounted on the first bracket (21); the synchronous belt (232) is sleeved on the synchronous wheels (223) of all the first clamping members; the synchronous belt (232) is also sleeved on the transmission wheel of the first driving member (231), or the first driving member (231) is connected to the synchronous wheel (223) of one of the first clamping members; the first driving member (231) drives the synchronous belt (232) and the synchronous wheel (223) to rotate.

7. The rotary tube grabbing device for an electric doffing machine according to claim 1, characterized in that: The first clamping assembly (2) is fixedly connected to the fixed frame (1) via a connecting shaft (4); the second clamping assembly (3) is slidably mounted on the connecting shaft (4) and is located between the fixed frame (1) and the first clamping assembly (2); the clamping drive mechanism is fixedly connected to the fixed frame (1), and the clamping drive mechanism is used to drive the second clamping assembly (3) to move on the connecting shaft (4).

8. The rotary tube grabbing device for an electric doffing machine according to claim 1, characterized in that: The second clamping assembly (3) is fixedly connected to the fixed frame (1) via a connecting shaft (4); the first clamping assembly (2) is slidably mounted on the connecting shaft (4) and is located between the fixed frame (1) and the second clamping assembly (3); the clamping drive mechanism is fixedly connected to the fixed frame (1); the clamping drive mechanism is used to drive the first clamping assembly (2) to move on the connecting shaft (4).

9. The rotary tube grabbing device for an electric doffing machine according to claim 7, characterized in that: The clamping drive mechanism comprises a second driving member (61), a second rotating shaft (62), a cam (63) and a connecting block (64); the second driving member is fixedly mounted on the fixing frame (1); the second driving member (61) is connected to the second rotating shaft (62); the cam (63) is fixedly arranged on the second rotating shaft (62); one end of the connecting block (64) is connected to the second bracket (31) of the second clamping assembly (3); the other end of the connecting block (64) is provided with a roller (65); the roller (65) is in contact with the cam (63).

10. The rotary tube grabbing device for an electric doffing machine according to claim 8, characterized in that: The clamping drive mechanism comprises a second drive member (61), a second rotating shaft (62), a cam (63) and a connecting block (64); the second drive member is fixedly mounted on the fixing frame (1); the second drive member (61) is connected to the second rotating shaft (62); the cam (63) is fixedly arranged on the second rotating shaft (62); one end of the connecting block (64) is connected to the first bracket (21) of the first clamping assembly (2); the other end of the connecting block (64) is provided with a roller (65); the roller (65) is in contact with the cam (63).

11. The rotary tube grabbing device for an electric doffing machine according to claim 9 or 10, characterized in that: The connecting shaft (4) is sleeved with a spring (5), and the spring (5) is located between the first clamping assembly (2) and the second clamping assembly (3).

12. The rotary tube grabbing device for an electric doffing machine according to claim 1, characterized in that: It also comprises a hanging part, which is fixedly connected to the fixing frame (1).

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