A smart cable fixing device for sampling

Abstract

This invention discloses an intelligent cable fixing device for wellhead and oil tubing, specifically relating to the field of cable fixing. The device includes a wellhead and tubing, with the tubing positioned inside the wellhead and an installation assembly positioned outside the wellhead. A fixing assembly is located on one side of the installation assembly. The installation assembly includes a fixing clamp sleeved on the outside of the wellhead, with a fixing screw inside the clamp inserted into the wellhead. A fixing nut is threaded to the bottom end of the fixing screw. The fixing assembly includes a support frame positioned on one side of the fixing clamp, with an arc-shaped connecting column fixedly connected to the side of the support frame near the fixing clamp. The arc-shaped connecting column is slidably connected inside the fixing clamp. A fixing side plate is fixedly connected to one side of the support frame. This invention uses the fixing assembly to limit and protect the cable, preventing friction between the cable and the wellhead and reducing other possible friction on the cable, thereby avoiding severe wear and reduced service life.

Description

Technical Field

[0001] This invention relates to the field of cable fixing technology, and more specifically, to an intelligent cable fixing device for sorting and mining. Background Technology

[0002] After a long period of development, major oilfields have entered the later stages of high water-cut development. Oil well production is characterized by multiple oil layers, long well sections, large interlayers, and severe interlayer heterogeneity. Oil well production has gradually evolved from traditional single-well combined production to stratified oil production, improving oilfield recovery rates, saving development costs, and achieving significant economic benefits. With the rapid development of digitalization and intelligentization in oilfields, intelligent stratified oil production technology has emerged. Currently, intelligent stratified oil production technology is mainly divided into two categories: cabled intelligent stratified oil production technology and cableless intelligent stratified oil production technology.

[0003] In the case of cable-based intelligent stratified oil production technology, the cable needs to run from the lowest production distribution device in the well all the way to the wellhead. If the cable is too long, it is easy to cause friction between the cable and the wellhead during construction, resulting in high wear and damage to the cable and affecting its service life. Therefore, in order to address this problem, this application provides an intelligent stratified oil production cable fixing device to meet the requirements. Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide an intelligent mining cable fixing device, which limits and protects the cable through fixing components, avoids friction between the cable and the wellhead, and reduces other possible frictions of the cable, thereby preventing severe wear and reduced service life of the cable and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A smart distribution cable fixing device includes a wellhead and a tubing. The tubing is disposed inside the wellhead, and an installation assembly is disposed outside the wellhead. A fixing assembly is disposed on one side of the installation assembly. The installation assembly includes a fixing clamp sleeved on the outside of the wellhead. A fixing screw is disposed inside the fixing clamp and inserted into the inside of the wellhead. A fixing nut is threaded to the bottom end of the fixing screw. The fixing assembly includes a support frame disposed on one side of the fixing clamp. An arc-shaped connecting column is fixedly connected to the side of the support frame near the fixing clamp and is slidably connected inside the fixing clamp. A fixing side plate is fixedly connected to one side of the support frame and is fixedly connected to the fixing clamp by bolts. A cable is disposed inside the support frame, and a first shaft is disposed inside the support frame. A transmission connecting frame is rotatably connected to the outside of the first shaft, and a first torsion spring is fixedly connected between the first shaft and the transmission connecting frame.

[0007] The mounting components enable the device to be connected and fixed to the oil pipe. At the same time, the mounting components can be disassembled and separated from the fixing components, allowing the fixing components to be replaced. This allows the fixing components to accommodate cables of different sizes, thereby improving the flexibility of the device and meeting different practical needs.

[0008] In the above technical solution, the transmission connecting frame is further disposed inside the support shell, and a support rod is fixedly connected to the inner side of the transmission connecting frame. A fixed ball is fixedly connected to one end of the support rod. The number of support rods and fixed balls is set to multiple, and the multiple support rods and fixed balls are distributed in a triangular shape on the inner side of the transmission connecting frame.

[0009] In the above technical solution, a second shaft is fixedly connected inside the support frame, a transmission sleeve is rotatably connected to the outside of the second shaft, and a second spring is fixedly connected between the second shaft and the transmission sleeve.

[0010] In the above technical solution, one end of the transmission sleeve is fixedly connected to a side connecting block, the side connecting block is slidably connected inside the support frame, and one side of the side connecting block is fixedly connected to a transmission column.

[0011] In the above technical solution, a movable frame is fixedly connected to the outer side of the transmission sleeve, a movable ball is fixedly connected to one end of the movable frame, an arc-shaped pressure plate is fixedly connected to the outer side of the movable frame, and the arc-shaped pressure plate is slidably connected to the inner side of the support shell.

[0012] The cable is limited and fixed by multiple fixed and movable ball components, keeping it away from the wellhead to avoid wear caused by friction. There are gaps between the multiple fixed ball components and the cable to meet the cable's descent displacement requirements.

[0013] In the above technical solution, the inner side of the support frame is further slidably connected to a movable connecting frame, one side of the movable connecting frame is fixedly connected to a fixed baffle, the side of the movable connecting frame away from the fixed baffle is fixedly connected to a transmission inclined frame, the arc-shaped pressure plate is arranged in an abutting position with the transmission inclined frame, and the inner side of the movable connecting frame is fixedly connected to a third spring, which is fixedly connected inside the support frame.

[0014] By using fixing components, cable movement can be limited to prevent wear and reduced service life. At the same time, when fixing the cable to the outside of the oil pipe, the movement trajectory of the cable can be limited, reducing manual intervention and thus avoiding friction that may occur when the cable moves.

[0015] The technical effects and advantages of this invention are as follows:

[0016] This invention, by setting a fixing component, allows the movable ball to separate from one side of multiple fixed balls by pulling the rotating handle, thereby placing the cable inside the multiple fixed balls. Then, the movable ball is reset. The multiple fixed balls and the movable ball can limit and fix the cable, making the cable lose contact with the oil pipe. This avoids wear caused by friction between the cable and the wellhead, and thus avoids the cable wear leading to a reduction in service life.

[0017] Meanwhile, when it is necessary to fix the cable to the oil pipe, after the cable is freed from its limit, continuing to pull the handle will cause the transmission column to push the transmission end plate, causing the transmission connecting frame to lose its fixation. Under the elastic action of the first torsion spring, the transmission connecting frame and multiple fixed balls can push the cable to move to the outside of the oil pipe and fit against the oil pipe, and keep the cable in its current position, thus achieving the purpose of fixing the cable to the outside of the oil pipe. This can reduce manual operation steps and improve the convenience of fixing the cable.

[0018] By pushing the cable to contact the oil pipe, manual intervention is reduced and the cable movement trajectory is fixed, so that no friction occurs during the contact between the cable and the oil pipe, thereby further reducing the possible wear of the cable.

[0019] This invention, by setting up an installation component that is separable from the fixing component, allows for the removal of the fixing component when the cable size is incompatible with it. This is achieved by unscrewing the bolts and pulling the fixing component to disengage the arc-shaped connecting post from the inside of the fixing clamp. By replacing the fixing component, the inner diameter of the multiple fixing balls can be made to match the cable size, thus enabling the installation to accommodate cables of various sizes. Furthermore, the installation component is easy to disassemble and replace, meeting the needs of practical applications. Attached Figure Description

[0020] Figure 1 A three-dimensional structural diagram of the intelligent mining cable fixing device and its assembly at the wellhead;

[0021] Figure 2 for Figure 1 Enlarged view of the A-section structure;

[0022] Figure 3 This is a sectional view of the top structure of the intelligent cable fixing device.

[0023] Figure 4 for Figure 3 Enlarged view of the structure of section B;

[0024] Figure 5 A side view diagram of the intelligent cable fixing device;

[0025] Figure 6 for Figure 5 Enlarged view of the C-section structure;

[0026] Figure 7 This is a partial structural cross-sectional view of the intelligent mining cable fixing device;

[0027] Figure 8 for Figure 7 Enlarged view of the structure of part D.

[0028] The attached diagram is labeled as follows: 1. Wellhead; 2. Tubing; 3. Fixing clamp; 4. Fixing screw; 5. Fixing nut; 6. Support frame; 7. First shaft column; 8. Transmission connecting frame; 9. First torsion spring; 10. Support rod; 11. Fixing ball; 12. Connecting frame plate; 13. Limiting insert; 14. Positioning column; 15. First spring; 16. Transmission end plate; 17. Second shaft column; 18. Transmission sleeve; 19. Second spring; 20. Side connecting block; 21. Transmission column; 22. Connecting column; 23. Turntable; 24. Rotating handle; 25. Movable frame; 26. Movable ball; 27. Arc-shaped pressure plate; 28. Movable connecting frame; 29. ​​Fixed baffle; 30. Third spring; 31. Transmission inclined frame; 32. Cable; 33. Arc-shaped connecting column; 34. Fixed side plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Refer to the instruction manual appendix Figures 1-8 As shown, an intelligent sampling cable fixing device according to an embodiment of the present invention includes a wellhead 1 and an oil pipe 2. The oil pipe 2 is disposed inside the wellhead 1, and an installation component is disposed outside the wellhead 1. A fixing component is disposed on one side of the installation component. The installation component includes a fixing clamp 3 sleeved on the outside of the wellhead 1. A fixing screw 4 is disposed inside the fixing clamp 3. A transverse through hole is disposed at the top of the fixing screw 4 for connecting with a tool such as a plug rod to improve the ease of rotation. The fixing screw 4 is inserted into the inside of the wellhead 1, and a fixing nut 5 is threadedly connected to the bottom end of the fixing screw 4.

[0031] The fixing assembly includes a support frame 6 disposed on one side of the fixing clamp 3. An arc-shaped connecting post 33 is fixedly connected to the side of the support frame 6 near the fixing clamp 3. The arc-shaped connecting post 33 is arranged in an "Ω" shape. The arc-shaped connecting post 33 can improve the stability of the connection between the fixing assembly and the fixing clamp 3. The arc-shaped connecting post 33 is slidably connected inside the fixing clamp 3. A fixing side plate 34 is fixedly connected to one side of the support frame 6. The fixing side plate 34 is fixedly connected to the fixing clamp 3 by bolts. A cable 32 is disposed on the inner side of the support frame 6.

[0032] It should be noted that the connection between the device and the wellhead 1 is achieved by clamping the fixing clamp 3 sets on the outside of the wellhead 1 and fixing it with the fixing screw 4 and the fixing nut 5.

[0033] Meanwhile, the fixing component is connected to the fixing clamp 3 via the arc-shaped connecting post 33 and the bolt. Since the cable size is different, when the cable size is not compatible with the fixing component, the fixing component can be disassembled by removing the bolt and pulling the fixing component to make the arc-shaped connecting post 33 come out from the inside of the fixing clamp 3. During installation, the installation is completed by connecting the arc-shaped connecting post 33 to the fixing clamp 3 and passing the bolt through the fixing side plate 34 to connect with the fixing clamp 3. The installation component can be replaced to adapt to different cable sizes, and the installation component is easy to disassemble and replace, meeting the needs of actual use.

[0034] Furthermore, a first shaft column 7 is provided inside the support shell 6. A transmission connecting frame 8 is rotatably connected to the outside of the first shaft column 7. A first torsion spring 9 is fixedly connected between the first shaft column 7 and the transmission connecting frame 8. The elastic force of the first torsion spring 9 can drive the transmission connecting frame 8 to rotate. The transmission connecting frame 8 is located inside the support shell 6. A support rod 10 is fixedly connected to the inside of the transmission connecting frame 8. A fixed ball 11 is fixedly connected to one end of the support rod 10. The number of support rods 10 and fixed balls 11 is set to multiple. The multiple support rods 10 and fixed balls 11 are triangularly distributed on the inside of the transmission connecting frame 8. The multiple fixed balls 11 and the movable ball 26 mentioned below are all set with the same spherical outline. The multiple fixed balls 11 and the gap between the fixed balls 11 and the movable ball 26 are much smaller than the diameter of the cable 32 to prevent the cable 32 from slipping through the gap.

[0035] It should be noted that multiple fixed ball parts 11 limit the cable 32 to prevent the cable 32 from contacting the wellhead 1, thereby avoiding friction and wear. At the same time, the multiple fixed ball parts 11 are all spherical, which can greatly reduce the friction between them and the cable 32 and ensure the integrity of the cable 32.

[0036] Multiple fixed ball components 11 arranged in a triangular shape are connected to the transmission connecting frame 8. When the transmission connecting frame 8 rotates, the multiple fixed ball components 11 can drive the fixed ball components 11 to move, thereby improving the convenience of fixing the cable 32 to the oil pipe 2.

[0037] Furthermore, a second shaft 17 is fixedly connected inside the support frame 6, and a transmission sleeve 18 is rotatably connected to the outside of the second shaft 17. A second spring 19 is fixedly connected between the second shaft 17 and the transmission sleeve 18. The elastic force of the second spring 19 can drive the transmission sleeve 18 to reset. A movable frame 25 is fixedly connected to the outside of the transmission sleeve 18. A movable ball 26 is fixedly connected to one end of the movable frame 25. The movable ball 26, like the fixed ball 11, abuts and limits the cable 32.

[0038] An arc-shaped pressure plate 27 is fixedly connected to the outer side of the movable frame 25. The arc-shaped pressure plate 27 is slidably connected to the inner side of the support shell 6. A movable connecting frame 28 is slidably connected to the inner side of the support shell 6. A fixed baffle 29 is fixedly connected to one side of the movable connecting frame 28. The fixed baffle 29 abuts against the cable 32. A transmission inclined frame 31 is fixedly connected to the side of the movable connecting frame 28 away from the fixed baffle 29. The arc-shaped pressure plate 27 and the transmission inclined frame 31 are set in an abutting position. A third spring 30 is fixedly connected to the inner side of the movable connecting frame 28. The third spring 30 is fixedly connected to the inside of the support shell 6.

[0039] One end of the transmission sleeve 18 is fixedly connected to a connecting post 22, which is rotatably connected inside the support frame 6. One end of the connecting post 22 is fixedly connected to a turntable 23, and a handle 24 is fixedly connected to the outside of the turntable 23.

[0040] It should be noted that during construction, pulling the handle 24 causes the transmission sleeve 18 to rotate, while the second spring 19 is stretched, thereby causing the movable frame 25 to move in a circular motion. The movable ball 26 moves along with it until it disengages from the sides of the multiple fixed balls 11. At the same time, the arc-shaped pressure plate 27 separates from the transmission inclined frame 31. At this point, the movable connecting frame 28 loses its limit, and the third spring 30 contracts, causing the movable connecting frame 28 to slide into the support shell 6 until the fixed baffle 29 enters the support shell 6 and separates from the cable 32, thus creating an opening on one side. At this point, the cable can be placed between the multiple fixed balls 11. Then, the movable frame 25 is released. Because the elasticity of the third spring 30 is lower than that of the second spring 19, the second spring 19 contracts, causing the movable connecting frame 25 to move in a circular motion. When the connecting frame 28 is reset, the arc-shaped pressure plate 27 abuts against the inclined surface of the transmission inclined frame 31. Under the guidance of the transmission inclined frame 31, the movable connecting frame 28 is displaced outward, thereby moving the fixed baffle 29 to the outside of the cable 32 to block and limit the cable 32. The fixed baffle 29 can further improve the fixing strength of the cable 32. At the same time, the movable ball 26 moves to one side of the cable 32 for limitation, thus completing the fixing and limitation of the cable 32. Since the multiple fixed balls 11 and the movable balls 26 are located inside the wellhead 1, when the cable 32 is limited to the current position, the cable 32 can avoid contact with the edge of the wellhead 1, thereby avoiding wear caused by friction between the cable 32 and the wellhead 1, and thus avoiding the reduction of the service life of the cable 32 due to wear.

[0041] A small gap is created between the multiple fixed ball pieces 11 and the cable 32, which ensures that the cable 32 can move downward between the multiple fixed ball pieces 11 to meet construction requirements.

[0042] Furthermore, a connecting frame plate 12 is slidably connected inside the supporting shell 6. One end of the connecting frame plate 12 is fixedly connected to a limiting pin 13, which is inserted into the transmission connecting frame 8. The insertion of the limiting pin 13 into the transmission connecting frame 8 forms a fixation of the limiting pin 13. A positioning pin 14 is fixedly connected inside the supporting shell 6, and the connecting frame plate 12 is slidably connected to the outside of the positioning pin 14. The positioning pin 14 supports the connecting frame plate 12 to improve its stability. A first spring 15 is fixedly connected to the inner side of the plate 12. The first spring 15 is fixedly connected to the inside of the support frame 6. A transmission end plate 16 is fixedly connected to the end of the connecting frame plate 12 away from the limiting insert 13. A side connecting block 20 is fixedly connected to one end of the transmission sleeve 18. The side connecting block 20 is slidably connected to the inside of the support frame 6. The side connecting block 20 is set with an arc-shaped profile. A transmission column 21 is fixedly connected to one side of the side connecting block 20. The transmission end plate 16 is located on the path of the transmission column 21 during circumferential displacement.

[0043] It should be noted that, when the cable 32 needs to be fixed to the oil pipe 2 after it has moved down a certain distance, the cable 32 is released from its limit by pulling the handle 24. After the movable ball 26 and the fixed baffle 29 lose contact with the cable 32, the handle 24 is pulled again to rotate the transmission sleeve 18. When the transmission sleeve 18 rotates, it will cause the side connecting block 20 to slide inside the support frame 6, thereby causing the transmission column 21 to move in a circular motion. If the transmission sleeve 18 continues to rotate, the transmission column 21 will contact the transmission end plate 16, thereby pushing the connecting frame plate 12 to slide inside the support frame 6. The sliding of the connecting frame plate 12 will cause the limiting pin 13 to move until the limiting pin 13 separates from the transmission connecting frame 8. At this time, the transmission connecting frame 8 loses its limit. Under the elastic action of the first torsion spring 9, the transmission connecting frame 8 drives multiple fixed ball parts 11 to perform circumferential displacement. Thus, through the limiting effect of the fixed ball parts 11 on the cable 32, the cable 32 is pushed out from the inside of the support shell 6 and approaches the outer wall of the oil pipe 2. At this time, the cable 32 can be fixed on the outside of the oil pipe 2, which can improve the convenience of fixing the cable 32, reduce manual labor, and fix the movement trajectory of the cable 32 to avoid friction when the cable 32 approaches the oil pipe 2. When the cable 32 approaches the outer wall of the oil pipe 2, it is still in a state of being limited by multiple fixed ball parts 11. This ensures that the cable 32 can remain stationary in one place when it is in contact with the oil pipe 2, thereby preventing the cable 32 from shifting on the outside of the oil pipe 2 and facilitating the fixing of the cable 32.

[0044] Since the transmission column 21 is in contact with the transmission end plate 16 after the movable ball 26, transmission end plate 16 and cable 32 lose contact, the transmission connecting frame 8 can be selected to make circumferential displacement. Therefore, when fixing the cable 32 inside the multiple fixed balls 11, it is not necessary for the transmission column 21 to contact the transmission end plate 16, so the state of the transmission connecting frame 8 can be flexibly selected. At the same time, after the cable 32 is fixed on the oil pipe 2, the transmission connecting frame 8 needs to be manually pushed to reset, so that the transmission end plate 16 loses the resistance of the transmission column 21, so that the limiting plug 13 can be reset to fix the transmission connecting frame 8. This realizes the cycle of this device. When construction continues, the above steps are used to limit the cable 32 again.

[0045] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0046] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0047] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart wellhead cable fixing device, comprising a wellhead (1) and an oil pipe (2), characterized in that, The tubing (2) is located inside the wellhead (1), and an installation assembly is located outside the wellhead (1). A fixing assembly is located on one side of the installation assembly. The installation assembly includes a fixing clamp (3) that is sleeved on the outside of the wellhead (1). A fixing screw (4) is located inside the fixing clamp (3). The fixing screw (4) is inserted into the inside of the wellhead (1). A fixing nut (5) is threaded to the bottom end of the fixing screw (4). The fixing assembly includes a support frame (6) located on one side of the fixing clamp (3). An arc-shaped connecting column (33) is fixedly connected to one side of the support frame (6) near the fixing clamp (3). The arc-shaped connecting column (33) is slidably connected inside the fixing clamp (3). A fixing side plate (34) is fixedly connected to one side of the support frame (6). The fixing side plate (34) is fixedly connected to the fixing clamp (3) by bolts. A cable (32) is provided on the inner side of the support frame (6). A first shaft column (7) is provided inside the support frame (6). A transmission connecting frame (8) is rotatably connected to the outer side of the first shaft column (7).

2. The intelligent sampling cable fixing device according to claim 1, characterized in that, A first torsion spring (9) is fixedly connected between the first shaft column (7) and the transmission connecting frame (8). The transmission connecting frame (8) is located inside the support shell frame (6). A support rod (10) is fixedly connected to the inner side of the transmission connecting frame (8). A fixed ball (11) is fixedly connected to one end of the support rod (10). The number of support rods (10) and fixed balls (11) is set to multiple. The multiple support rods (10) and fixed balls (11) are triangularly distributed on the inner side of the transmission connecting frame (8).

3. The intelligent sampling cable fixing device according to claim 1, characterized in that, The support frame (6) has a sliding connection to a connecting frame plate (12), and one end of the connecting frame plate (12) is fixedly connected to a limiting pin (13), which is inserted into the transmission connecting frame (8).

4. The intelligent sampling cable fixing device according to claim 3, characterized in that, The support frame (6) is fixedly connected to a positioning column (14), the connecting frame plate (12) is slidably connected to the outside of the positioning column (14), the inner side of the connecting frame plate (12) is fixedly connected to a first spring (15), the first spring (15) is fixedly connected to the inside of the support frame (6), and the end of the connecting frame plate (12) away from the limiting insert (13) is fixedly connected to a transmission end plate (16).

5. The intelligent sampling cable fixing device according to claim 1, characterized in that, The support frame (6) is internally fixedly connected to a second shaft (17), and the outside of the second shaft (17) is rotatably connected to a transmission sleeve (18). A second spring (19) is fixedly connected between the second shaft (17) and the transmission sleeve (18).

6. The intelligent sampling cable fixing device according to claim 5, characterized in that, One end of the transmission sleeve (18) is fixedly connected to a side connecting block (20), the side connecting block (20) is slidably connected inside the support frame (6), and a transmission column (21) is fixedly connected to one side of the side connecting block (20).

7. The intelligent sampling cable fixing device according to claim 6, characterized in that, The transmission sleeve (18) is fixedly connected to a connecting column (22) at one end away from the side connecting block (20). The connecting column (22) is rotatably connected inside the support frame (6). A turntable (23) is fixedly connected to one end of the connecting column (22). A handle (24) is fixedly connected to the outside of the turntable (23).

8. The intelligent sampling cable fixing device according to claim 5, characterized in that, A movable frame (25) is fixedly connected to the outer side of the transmission sleeve (18), a movable ball (26) is fixedly connected to one end of the movable frame (25), an arc-shaped pressure plate (27) is fixedly connected to the outer side of the movable frame (25), and the arc-shaped pressure plate (27) is slidably connected to the inner side of the support shell (6).

9. The intelligent sampling cable fixing device according to claim 8, characterized in that, The inner side of the support frame (6) is slidably connected to a movable connecting frame (28), and a fixed baffle (29) is fixedly connected to one side of the movable connecting frame (28). A transmission inclined frame (31) is fixedly connected to the side of the movable connecting frame (28) away from the fixed baffle (29). The arc-shaped pressure plate (27) is set in abutment with the transmission inclined frame (31). A third spring (30) is fixedly connected to the inner side of the movable connecting frame (28). The third spring (30) is fixedly connected inside the support frame (6).

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