A continuous die for hardware stamping

Abstract

The application discloses a continuous die for hardware stamping, and relates to the technical field of hardware stamping, which comprises a bottom platform, a lower pressing piece is installed on the lower surface of a rotating piece, a through groove is formed in the upper surface of the rotating piece, an extruding piece is slidably connected in the through groove, the extruding piece is in contact with the lower pressing piece, a detecting piece is installed on the side of the lower pressing piece away from the rotating piece, the lower pressing structure is moved downward to drive the detecting die and the laser sensor to move into the finished product, the size of the finished product is detected by the laser sensor, unqualified products in the stamping process are ensured to be found in time, the linear motion of the moving block in the longitudinal track drives the linear motion of the lower pressing structure, the deviation of the finished product during the moving process is ensured not to occur, the finished product is resisted during the moving process of the lower pressing structure, the influence caused by vibration during the stamping of the stamping die is reduced, and the qualified rate of the finished product after being cut by the cutter is improved.

Description

Technical Field

[0001] This invention relates to the field of metal stamping technology, specifically to a progressive die for metal stamping. Background Technology

[0002] Continuous stamping dies, also known as progressive dies or step dies, are core equipment for achieving efficient and automated production in metal stamping processes. They are widely used in the mass production of precision parts in fields such as automobile manufacturing, electronic components, and hardware accessories.

[0003] Its core working principle is to break down the forming process of a complex stamping part into multiple simple stations. In a single stroke of the press, the strip raw material passes through different stations in sequence to complete multiple processes such as punching, trimming, bending, drawing, and blanking. After each stamping, the strip moves precisely at a fixed step distance until the final workpiece is formed. This process-integrated processing method can significantly improve production efficiency compared to single-operation dies and compound dies. The production efficiency of a progressive die is usually several times or even dozens of times that of a single-operation die.

[0004] In continuous stamping dies, die positioning is crucial as it affects the yield rate of finished parts. However, in existing technologies, the raw material is prone to errors due to vibrations generated during the stamping process, especially when it is about to enter the cutting blade. Since the stamping is already completed at this position, the connection is weak and there are no extra holes for the positioning rod to position it, resulting in a lower yield rate of finished parts after cutting. Summary of the Invention

[0005] The purpose of this invention is to provide a progressive die for metal stamping to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a continuous die for metal stamping, comprising a bottom platform, hydraulic rods mounted on both sides of the upper surface of the bottom platform, a lower pressure plate mounted on the movable end of the hydraulic rods, a stamping die mounted on the lower surface of the lower pressure plate, a cutter mounted on the side of the lower surface of the lower pressure plate away from the stamping die, a rectangular groove formed on the lower surface of the lower pressure plate, a support rod disposed within the rectangular groove, the support rod mounted on the upper surface of the bottom platform, a rotating component mounted on the side of the support rod away from the bottom platform, a pressing component mounted on the lower surface of the rotating component, a through groove formed on the upper surface of the rotating component, an extrusion component slidably connected within the through groove, the extrusion component contacting the pressing component, and a detection component mounted on the side of the pressing component away from the rotating component.

[0007] Furthermore, the rotating component includes a support plate, the rotating component is mounted on the lower surface of the support plate, the support plate is mounted on the side of the support rod away from the bottom platform, an arc-shaped track and a longitudinal track are mounted on the lower surface of the support plate, the ends of the arc-shaped track and the longitudinal track are connected, three moving blocks are slidably connected in the arc-shaped track, the pressing component is mounted on the lower surface of the moving blocks, and connecting chains are mounted on both sides of the three moving blocks, and the three connecting chains are of the same length and cannot be extended.

[0008] Furthermore, the pressing component includes a pressing cylinder, which is mounted on the surface of the moving block. A limiting ring is installed inside the pressing cylinder, and multiple grooves are formed inside the limiting ring. Telescopic components are installed inside the grooves, and extension components are slidably connected inside the multiple limiting components. Both sides of the upper surface of the support plate are provided with through slots that penetrate the support plate, the moving block, and the connection between the arc-shaped track and the end of the longitudinal track. Extrusion components are installed inside the through slots, and the extrusion components are in contact with the extension components.

[0009] Furthermore, the telescopic component includes a wedge block that is slidably connected within a groove. Multiple wedge blocks are in slidable contact with the extension component. One end of the wedge block within the groove has a first elastic element, and the end of the first elastic element away from the wedge block is installed within the groove.

[0010] Furthermore, the extension member includes an extension rod that is slidably connected within the space formed by multiple inclined blocks. The upper end of the extension rod is in contact with the extrusion member. The detection member is installed at the end of the extension rod away from the extrusion rod. An annular groove is formed on the annular surface of the extension rod, and a blocking member is installed in the annular groove. The blocking member is in slidable contact with the inclined blocks. A connecting member is installed on the upper side of the annular surface of the extension rod, and the inner annular surface of the lower pressure cylinder is installed at the end of the connecting member away from the extension rod.

[0011] Furthermore, the blocking member includes a first conical ring and a second conical ring. The first conical ring is installed on the lower side of the annular surface of the annular groove and slides in contact with a plurality of inclined blocks. The second conical ring is slidably connected to the upper side of the annular groove and slides in contact with a plurality of inclined blocks. An annular groove is formed on the lower surface of the second conical ring, and the first conical ring is slidably connected to the annular groove.

[0012] Furthermore, the connector includes a connecting ring, which is mounted on the annular surface of the extension rod. A plurality of second elastic elements are mounted on the upper surface of the connecting ring, and a support ring is mounted on the annular inner surface of the pressure cylinder. The end of the second elastic element away from the connecting ring is connected to the support ring.

[0013] Furthermore, the extrusion member includes an extrusion rod, which is disposed in a through groove at the support plate. An extrusion plate is installed at the upper end of the extrusion rod, and the end of the extrusion plate away from the extrusion rod is connected to the lower pressure plate.

[0014] Furthermore, the detection component includes a detection mold, a laser sensor is installed inside the detection mold, the output end of the laser sensor is electrically connected to a processor, the output end of the processor is electrically connected to an alarm, and a telescopic component is installed at the lower end of the extension rod, the telescopic component being connected to the detection mold.

[0015] Furthermore, the telescopic component includes a telescopic cylinder, which is installed on the upper surface of the detection mold. The end of the telescopic cylinder away from the detection mold is sleeved on the annular surface of the extension rod. A third elastic element is installed at the lower end of the extension rod, and the end of the third elastic element away from the extension rod is installed inside the telescopic cylinder.

[0016] This invention provides a progressive die for metal stamping, which has the following advantages:

[0017] 1. This invention uses a pressing structure, consisting of a pressing cylinder, a limiting ring, a first elastic element, an inclined block, an extension rod, a connecting ring, a support ring, a second elastic element, a first conical ring, and a second conical ring, installed on the lower surface of the moving block. When the pressing plate moves downward, the extension rod is squeezed by the extrusion structure consisting of an extrusion plate and an extrusion rod, causing the pressing structure to move downward and drive the detection mold and laser sensor to move into the stamped finished part. The laser sensor is used to detect the dimensions of the finished part, ensuring that defective products are detected in a timely manner during the stamping process.

[0018] 2. This invention utilizes the linear motion of the moving block within the longitudinal track to drive the linear motion of the pressing structure. When the raw material is conveyed and the finished part moves, the pressing structure moves along with the finished part, ensuring that no deviation occurs during the movement of the stamped finished part. Furthermore, the pressing structure supports the finished part during the movement, thereby reducing the impact of vibration caused by the stamping die and improving the pass rate of the finished part after it is cut at the cutting blade.

[0019] 3. The present invention installs an arc-shaped track and a longitudinal track on the lower surface of the support plate, and slides three moving blocks within the arc-shaped track and the longitudinal track. The three moving blocks are connected by a connecting chain. The three moving blocks alternately drive the pressing structure to move, thereby enabling the detection mold and laser sensor installed on the pressing structure to alternately detect the stamped finished parts, thus ensuring that each finished part is detected and supported. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a progressive die for metal stamping according to the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly of the telescopic cylinder, extension rod, pressure cylinder, and detection mold and support plate of a continuous die for metal stamping according to the present invention.

[0022] Figure 3 This is a top view of the assembly of the telescopic cylinder, extension rod, pressing cylinder and testing mold of a continuous die for metal stamping according to the present invention on the support plate;

[0023] Figure 4 This is a schematic diagram of the assembly of the arc-shaped track and longitudinal track with the support plate of a continuous die for metal stamping according to the present invention.

[0024] Figure 5 This is a schematic diagram of the assembly of the extension rod of a continuous die for metal stamping in the lower cylinder according to the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly of the first and second conical rings of a continuous die for metal stamping of the present invention among multiple inclined blocks.

[0026] In the diagram: 1. Bottom platform; 2. Support rod; 3. Cutting blade; 4. Extrusion rod; 5. Extrusion plate; 6. Support plate; 7. Rectangular groove; 8. Lower pressure plate; 9. Stamping die; 10. Hydraulic rod; 11. Telescopic cylinder; 12. Extension rod; 13. Lower pressure cylinder; 14. Arc track; 15. Inspection die; 16. Connecting chain; 17. Laser sensor; 18. Longitudinal track; 19. Moving block; 20. Through groove; 21. Annular groove; 22. Second conical ring; 23. Restriction ring; 24. First conical ring; 25. Third elastic element; 26. Support ring; 27. Connecting ring; 28. Second elastic element; 29. ​​Inclined block; 30. First elastic element. Detailed Implementation

[0027] Please see Figures 1 to 6 The present invention provides a technical solution: a continuous die for metal stamping, comprising a bottom platform 1, hydraulic rods 10 mounted on both sides of the upper surface of the bottom platform 1, a lower pressure plate 8 mounted on the movable end of the hydraulic rods 10, a stamping die 9 mounted on the lower surface of the lower pressure plate 8, a cutter 3 mounted on the side of the lower surface of the lower pressure plate 8 away from the stamping die 9, a rectangular groove 7 formed on the lower surface of the lower pressure plate 8, a support rod 2 disposed in the rectangular groove 7, the support rod 2 mounted on the upper surface of the bottom platform 1, a support plate 6 mounted on the side of the support rod 2 away from the bottom platform 1, and an arc-shaped groove 6 mounted on the lower surface of the support plate 6. The system includes an arc track 14 and a longitudinal track 18, with the arc track 14 connected to the end of the longitudinal track 18. Three movable blocks 19 are slidably connected within the arc track 14. Each of the three movable blocks 19 has a connecting chain 16 installed on both sides. The three connecting chains 16 are of the same length and cannot be extended. The connecting chains 16 limit the position of the three movable blocks 19. When one movable block 19 moves, the other two movable blocks 19 will also move under the pull of the connecting chains 16, thereby causing the three movable blocks 19 to rotate within the arc track 14 and the longitudinal track 18.

[0028] A pressing cylinder 13 is mounted on the surface of the movable block 19. A limiting ring 23 is installed inside the pressing cylinder 13. Multiple grooves are formed in the limiting ring 23, and inclined blocks 29 are inserted into the grooves. One end of the inclined block 29 in the groove has a first elastic element 30, which is a spring. In its normal state, the end of the first elastic element 30 away from the inclined block 29 is installed in the groove. An extension rod 12 is arranged between the multiple inclined blocks 29. An annular groove 21 is formed on the annular surface of the extension rod 12. A first conical ring 24 and a second conical ring 22 are installed in the annular groove 21. The end of the first conical ring 24 faces downward, and the end of the second conical ring 22 faces upward. The first conical ring 24 is installed on the lower side of the annular surface of the annular groove 21 and slides in contact with the multiple inclined blocks 29. The conical ring 22 is slidably connected to the upper side of the annular groove 21 and slidably contacts multiple inclined blocks 29. The lower surface of the second conical ring 22 is provided with an annular groove 21. The first conical ring 24 is slidably connected to the annular groove 21. When the extension rod 12 moves downward a short distance, the first conical ring 24 passes through multiple inclined blocks 29 and is stuck below them. At this time, the extension rod 12 cannot move upward again. When the extension rod 12 moves downward again, the second conical ring 22 also passes through multiple inclined blocks 29 and the first conical ring 24 enters the annular groove 21. When the extension rod moves upward again, the second conical ring 22 pushes away the inclined blocks 29, and the first conical ring 24 moves back to above the multiple inclined blocks 29 along with the second conical ring 22. At this time, the position of the extension rod 12 is restored.

[0029] A connecting ring 27 is installed on the annular surface of the extension rod 12. Multiple second elastic elements 28, which are springs, are installed on the upper surface of the connecting ring 27. The second elastic elements 28 are in the normal state. A support ring 26 is installed on the annular inner surface of the pressure cylinder 13. The end of the second elastic element 28 away from the connecting ring 27 is connected to the support ring 26. When the extension rod 12 moves downward, the second elastic element 28 is in a stretched state. When the second conical block moves below the inclined block 29, the inclined block 29 can no longer support the first conical ring 24. At this time, the second elastic element 28 pulls the extension rod 12 to restore the position of the first conical ring 24 and the second conical ring 22.

[0030] Both sides of the upper surface of the support plate 6 are provided with through slots 20 that pass through the support plate 6, the moving block 19, and the arc track 14 and the end of the longitudinal track 18. A pressing rod 4 is inserted into the through slot 20, and the length of the pressing rod 4 near the cutter 3 is longer than the length of the pressing rod 4 near the stamping die 9. A pressing plate 5 is installed on the upper end of the pressing rod 4. The end of the pressing plate 5 away from the pressing rod 4 is connected to the lower pressure plate 8. When the lower pressure plate 8 moves downward, it can drive the pressing plate 5 to move downward. The downward movement of the pressing plate 5 can squeeze the extension rod 12 through the pressing rod 4, causing the extension rod 12 to move downward.

[0031] A telescopic cylinder 11 is sleeved on the lower side of the annular surface of the extension rod 12. A third elastic element 25, which is a spring, is installed inside the telescopic cylinder 11. In its normal state, the end of the third elastic element 25 away from the telescopic cylinder 11 is connected to the extension rod 12. A detection mold 15 is installed at the end of the telescopic cylinder 11 away from the extension rod 12. The space inside the detection mold 15 is the same size as the finished part. If the finished part has no dimensional error, the detection mold 15 can perfectly enclose the finished part and insert it into the stamping groove and stamping hole of the product part. A laser sensor 17 is installed inside the detection mold 15. The function of the laser sensor 17 is to detect the distance between the detection mold 15 and the finished part when they are in contact, and to determine whether there is an error in the size of the finished part. The output end of the laser sensor 17 is electrically connected to the processor, and the output end of the processor is electrically connected to the alarm. When the laser sensor 17 detects a product with an error, the laser sensor 17 transmits a signal to the processor, and the processor then sends a signal to the alarm to remind the engineer to recalibrate the stamping equipment.

[0032] By installing a pressing structure consisting of a pressing cylinder 13, a limiting ring 23, a first elastic element 30, an inclined block 29, an extension rod 12, a connecting ring 27, a support ring 26, a second elastic element 28, a first conical ring 24, and a second conical ring 22 on the lower surface of the moving block 19, when the pressing plate 8 moves downward, the extension rod 12 is squeezed by the extrusion structure consisting of an extrusion plate 5 and an extrusion rod 4, causing the pressing structure to move downward and drive the detection mold 15 and the laser sensor 17 to move into the stamped finished part. The laser sensor 17 is used to detect the dimensions of the finished part, ensuring that unqualified products in the stamping process are detected in a timely manner.

[0033] Furthermore, when the inspection mold 15 contacts the finished part, the linear motion of the moving block 19 within the longitudinal track 18 drives the linear motion of the pressing structure. When the raw material conveying drives the finished part to move, the pressing structure moves along with the finished part, ensuring that no deviation occurs during the movement of the stamped finished part. The pressing structure also supports the finished part during the movement, thereby reducing the impact of vibration caused by the stamping mold 9 during stamping, and thus improving the pass rate of the finished part after being cut at the cutter 3. The three moving blocks 19 are connected by the connecting chain 16, and the three moving blocks 19 alternately drive the pressing structure to move, thereby enabling the inspection mold 15 and the laser sensor 17 installed on the pressing structure to alternately inspect the stamped finished part, thus ensuring that each finished part is inspected and supported.

[0034] In summary, this progressive die for metal stamping, when in use, firstly, when the raw material to be processed is conveyed to the lower pressure plate 8, the hydraulic rod 10 is activated to drive the lower pressure plate 8 and the stamping die 9 to move downwards, and to continuously stamp multiple dies. When the finished part on the raw material is stamped and is about to be conveyed to the cutter 3 for cutting, after the finished part is conveyed to the support plate 6, the lower pressure plate 8 moves downwards, driving the extrusion plate 5 and extrusion rod 4 to move downwards. The extrusion rod 4 moves downwards to extrude the extension rod 12, causing the extension rod 12 to move downwards. At the same time, the first conical ring 24 installed on the annular surface of the extension rod 12 moves to the lower part of multiple inclined blocks 29. At this time, the detection die 15 also moves downwards and enters the finished part to be cut, and the laser sensor 17 is used to detect the finished part.

[0035] When the lower pressure plate 8 moves upward again, the first conical ring 24 is blocked and cannot move upward. Therefore, the inspection mold 15 remains inside the finished product and moves with the finished product to the cutter 3 along with the material conveyed by the feeder. Since the inspection mold 15 is connected to the moving block 19 through the telescopic cylinder 11 and the extension rod 12, the inspection mold 15 can drive the moving block 19 to move as the finished product moves. The moving block 19 can only move within the longitudinal track 18. Therefore, the inspection mold 15 limits the movement trajectory of the finished product while moving with it, preventing the finished product from tilting when it reaches the cutter 3. At the same time, since the inspection mold 15 forms a resistance to the finished product, when the finished product moves to the cutter 3, the lower pressure plate 8 moves downward again. The extrusion plate 5 and extrusion rod 4 installed near the cutter 3 extrude again, and the third elastic element 25 further extrudes to increase the resistance force of the inspection mold 15 to the finished product, thereby reducing the impact of the vibration generated by the stamping die 9 when stamping the raw material, and thus improving the pass rate of the finished product after being cut at the cutter 3.

[0036] When the workpiece to be finished, located below the inspection mold 15 and in front of it, is cut by the cutter 3, the hydraulic rod 10 drives the lower pressure plate 8 to move downwards, and the second conical ring 22 also enters below the inclined block 29 along with the extension rod 12. This causes the first conical ring 24 to enter the annular groove 21. When the hydraulic rod 10 drives the lower pressure plate 8 to move upwards again, the first elastic element 30 releases its rebound force, driving the extension rod 12 to move upwards. The extension rod 12 then drives the first conical ring 24 and the second conical ring 22 to move back above the inclined block 29. At this point, the inspection mold 15 separates from the workpiece to be finished.

[0037] Since the three moving blocks 19 sliding within the longitudinal track 18 and the arc track 14 are connected by the connecting chain 16, when one of the moving blocks 19 moves to the connection point of the longitudinal track 18 and the arc track 14 near the cutter 3, the moving block 19 near the stamping die 9 also moves to the connection point of the longitudinal track 18 and the arc track 14, thereby enabling the three moving blocks 19 to reciprocate to inspect and hold the stamped finished part.

[0038] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A progressive die for metal stamping, comprising a bottom platform (1), characterized in that, Hydraulic rods (10) are installed on both sides of the upper surface of the bottom platform (1). A lower pressure plate (8) is installed on the movable end of the hydraulic rod (10). A stamping die (9) is installed on the lower surface of the lower pressure plate (8). A cutter (3) is installed on the side of the lower surface of the lower pressure plate (8) away from the stamping die (9). A rectangular groove (7) is opened on the lower surface of the lower pressure plate (8). A support rod (2) is set in the rectangular groove (7). The support rod (2) is installed on the upper surface of the bottom platform (1). A rotating part is installed on the side of the support rod (2) away from the bottom platform (1). A lower pressure part is installed on the lower surface of the rotating part. A through groove (20) is opened on the upper surface of the rotating part. An extrusion part is slidably connected in the through groove (20). The extrusion part is in contact with the lower pressure part. A detection part is installed on the side of the lower pressure part away from the rotating part.

2. The progressive die for metal stamping according to claim 1, characterized in that, The rotating component includes a support plate (6), which is mounted on the lower surface of the support plate (6). The support plate (6) is mounted on the side of the support rod (2) away from the bottom platform (1). An arc-shaped track (14) and a longitudinal track (18) are mounted on the lower surface of the support plate (6). The arc-shaped track (14) is connected to the end of the longitudinal track (18). Three moving blocks (19) are slidably connected inside the arc-shaped track (14). The pressing component is mounted on the lower surface of the moving blocks (19). Connecting chains (16) are mounted on both sides of the three moving blocks (19), and the three connecting chains (16) are of the same length and cannot be extended.

3. The progressive die for metal stamping according to claim 2, characterized in that, The pressing component includes a pressing cylinder (13), which is installed on the surface of the moving block (19). A limiting ring (23) is installed inside the pressing cylinder (13). Multiple grooves are provided inside the limiting ring (23). Telescopic components are installed inside the grooves. Extension components are slidably connected inside the multiple limiting components. Both sides of the upper surface of the support plate (6) are provided with through slots (20) that pass through the support plate (6), the moving block (19), and the arc track (14) and connect to the end of the longitudinal track (18). An extrusion component is installed inside the through slot (20), and the extrusion component is in contact with the extension component.

4. The progressive die for metal stamping according to claim 3, characterized in that, The telescopic component includes a wedge (29) which is slidably connected in the groove. Multiple wedges (29) slide in contact with the extension component. One end of the wedge (29) in the groove has a first elastic element (30), and the end of the first elastic element (30) away from the wedge (29) is installed in the groove.

5. A progressive die for metal stamping according to claim 4, characterized in that, The extension includes an extension rod (12), which is slidably connected in the space formed by multiple inclined blocks (29). The upper end of the extension rod (12) is in contact with the extrusion member. The detection member is installed at the end of the extension rod (12) away from the extrusion rod (4). An annular groove is provided on the annular surface of the extension rod (12). A blocking member is installed in the annular groove. The blocking member is in slidable contact with the inclined block (29). A connecting member is installed on the upper side of the annular surface of the extension rod (12). The inner annular surface of the lower pressure cylinder (13) is installed at the end of the connecting member away from the extension rod (12).

6. A progressive die for metal stamping according to claim 5, characterized in that, The blocking component includes a first conical ring (24) and a second conical ring (22). The first conical ring (24) is installed on the lower side of the annular surface of the annular groove (21) and slides in contact with a plurality of inclined blocks (29). The second conical ring (22) is slidably connected to the upper side of the annular groove (21) and slides in contact with a plurality of inclined blocks (29). The lower surface of the second conical ring (22) is provided with an annular groove (21), and the first conical ring (24) is slidably connected to the annular groove (21).

7. A progressive die for metal stamping according to claim 4, characterized in that, The connector includes a connecting ring (27), which is mounted on the annular surface of the extension rod (12). A plurality of second elastic elements (28) are mounted on the upper surface of the connecting ring (27). A support ring (26) is mounted on the annular inner surface of the pressure cylinder (13). The end of the second elastic element (28) away from the connecting ring (27) is connected to the support ring (26).

8. A progressive die for metal stamping according to claim 4, characterized in that, The extrusion component includes an extrusion rod (4), which is disposed in a through groove (20) at the support plate (6). An extrusion plate (5) is installed on the upper end of the extrusion rod (4), and the end of the extrusion plate (5) away from the extrusion rod (4) is connected to the lower pressure plate (8).

9. A progressive die for metal stamping according to claim 5, characterized in that, The detection component includes a detection mold (15), a laser sensor (17) is installed inside the detection mold (15), the output end of the laser sensor (17) is electrically connected to a processor, the output end of the processor is electrically connected to an alarm, and a telescopic component is installed at the lower end of the extension rod (12), the telescopic component is connected to the detection mold (15).

10. A progressive die for metal stamping according to claim 9, characterized in that, The telescopic component includes a telescopic cylinder (11), which is installed on the upper surface of the testing mold (15). One end of the telescopic cylinder (11) away from the testing mold (15) is sleeved on the annular surface of the extension rod (12). A third elastic element (25) is installed at the lower end of the extension rod (12), and one end of the third elastic element (25) away from the extension rod (12) is installed inside the telescopic cylinder (11).

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