Automatic demolding mechanism and slippers laban injection mold

Abstract

The utility model relates to injection mold technical field, especially automatic demoulding mechanism and slippers pull bang injection mold of a kind of, including base and fixedly connected L type plate on the upper surface of base and the upper die being arranged above base, the lower part of the upper die is provided with lower die, the horizontal tooth rod is inserted in the sliding slot being opened in the inside of base;Lift the upper die by electric push rod drive, linkage longitudinal tooth rod, gear two, horizontal tooth rod, gear one etc. Component forms complete transmission chain, so that lower die is automatically completed rotating action in the stage of mould closing and stripping, cooperate the elastic push effect of top block and spring, realize the full-process automation of slippers pull bang from injection molding to automatic demoulding, replace traditional manual stripping mode, reduce manual intervention link, not only reduce manpower cost, also avoid the efficiency fluctuation of manual operation, make production rhythm more stable, significantly improve the product output in unit time.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an automatic demolding mechanism and a slipper zipper injection mold. Background Technology

[0002] In the slipper manufacturing industry, injection molds are indispensable key equipment. By precisely injecting molten plastic material into a pre-set mold cavity, and then cooling and solidifying it, they can efficiently mold slipper products that meet design requirements, providing important support for the large-scale production of slippers. Demolding, as a crucial link in the injection molding process, directly affects the overall production efficiency and the quality of the final product due to the smoothness and stability of its operation.

[0003] However, traditional slipper injection molds still largely rely on manual operation for demolding. This manual demolding method has many significant drawbacks: First, manual demolding is extremely inefficient. Each demolding operation requires operators to manually remove the molded slippers from the mold, which not only makes it difficult to keep up with the pace of assembly line production, leading to extended production cycles, but also requires a large investment of manpower to complete this repetitive work, significantly increasing the company's production costs. Second, manual operation has poor stability. Due to differences in the physical strength and operating habits of different operators, uneven force is easily caused during the demolding process. This may not only lead to deformation, scratches, and other damage to the slippers when they are removed, but also affect the dimensional accuracy and appearance quality of the slippers, thereby reducing the product qualification rate and causing unnecessary economic losses to the company.

[0004] It is evident that traditional manual demolding methods have become a significant factor restricting the improvement of production efficiency and product quality stability in slipper injection molding, and improving and optimizing these methods is of great practical significance. Utility Model Content

[0005] To overcome the technical defects of the existing technology, this utility model provides an automatic demolding mechanism and a slipper zipper injection mold.

[0006] The technical solution adopted by this utility model is: an automatic demolding mechanism, including a base, an L-shaped plate fixedly connected to the upper surface of the base, and an upper mold set above the base. A lower mold is set below the upper mold. A horizontal toothed rod is inserted into a groove opened inside the base. Gear 2 and Gear 1 are meshed on the surface of the horizontal toothed rod. A longitudinal toothed rod is set on one side of the L-shaped plate. The upper mold can be raised and lowered. When the upper mold is raised and lowered, it drives the longitudinal toothed rod to move longitudinally. When the longitudinal toothed rod moves longitudinally, it drives the horizontal toothed rod to move laterally through Gear 2. When the horizontal toothed rod moves, it can drive Gear 1 to rotate. The rotation of Gear 1 is used to drive the lower mold to rotate and realize the demolding of the slipper pull.

[0007] By adopting the above technical solution, the lifting action of the upper mold is transformed into the rotational motion of the lower mold through the sequential transmission of the longitudinal rack, gear two, horizontal rack, and gear one. Thus, after injection molding, the slipper zipper is automatically demolded by tilting the lower mold, providing a foundation for automated production.

[0008] Preferably, the upper surface of the base is fixedly connected to two side plates, and a gear is provided between the two side plates. The gear is rotatably connected to the side plates through a rotating shaft, and the transverse gear is slidably connected to the base.

[0009] By adopting the above technical solution, the side plate provides precise positioning and stable support for the gear, and the rotating shaft enables the gear to rotate flexibly, ensuring stable and reliable meshing transmission with the horizontal rack and preventing gear from shifting under force. The sliding connection between the horizontal rack and the base provides guidance for its lateral movement, ensuring the straightness of the horizontal rack when moving in the groove, thereby accurately transmitting power to the gear and ensuring the accuracy of the rotation angle of the lower mold.

[0010] Preferably, a connecting plate is fixedly connected to one side of the lower mold, the gear is fixedly connected to the connecting plate, two support plates are fixedly connected to the upper surface of the base, and the bottom surface of the lower mold is in contact with the support plates.

[0011] By adopting the above technical solution, the rotational motion of gear one is directly transmitted to the lower mold, realizing the synchronous action of the two. The support plate provides support for the lower mold during the injection molding stage, keeping the lower mold in a horizontal state, ensuring the sealing when the mold is closed with the upper mold, providing a stable cavity environment for injection molding, and limiting the excessive rotation of the lower mold to ensure the accuracy of the mold closing position.

[0012] Preferably, a second gear is provided in the bottom groove opened on the bottom surface of the L-shaped plate. The second gear is rotatably connected to the L-shaped plate through a second rotating shaft. The longitudinal toothed rod is meshed with the second gear. A U-shaped locking block is fixedly connected to one side of the L-shaped plate. The longitudinal toothed rod is slidably connected inside the U-shaped locking block.

[0013] By adopting the above technical solution, the bottom groove and the second rotating shaft provide installation space and rotational support for the second gear, ensuring that the second gear stably receives the longitudinal power of the longitudinal rack and converts it into the lateral power of the transverse rack. The U-shaped locking block guides and limits the longitudinal rack, preventing it from shifting left or right or wobbling when moving longitudinally, ensuring that it always maintains precise meshing with the second gear, and improving transmission efficiency and stability.

[0014] Preferably, an L-shaped rod is inserted into a square groove on the upper surface of the L-shaped plate, a weight is fixedly connected to the upper surface of the L-shaped rod, and the top end of the longitudinal toothed rod is fixedly connected to the L-shaped rod.

[0015] By adopting the above technical solution, the L-shaped rod serves as a connecting bridge between the upper mold and the longitudinal toothed rod, enabling their linkage. The weight ensures that the lower mold rotates to a horizontal state under the action of gravity, maintaining the continuity of transmission.

[0016] Preferably, optical axes are inserted into the sliding holes on both sides of the upper surface of the L-shaped plate, and the bottom end of the optical axis is fixedly connected to the upper mold.

[0017] By adopting the above technical solution, the optical axis and the sliding hole of the L-shaped plate cooperate to provide rigid guidance for the lifting and lowering movement of the upper mold, limit the horizontal offset and rotation of the upper mold during the movement process, and ensure that the upper mold always moves smoothly in the vertical direction, thereby ensuring the alignment accuracy when closing with the lower mold and avoiding injection defects or equipment damage caused by the skewness of the upper mold.

[0018] Preferably, an electric push rod is installed in the mounting hole on the upper surface of the L-shaped plate, and the end of the telescopic rod of the electric push rod is fixedly connected to the upper surface of the upper mold.

[0019] By adopting the above technical solution, the electric push rod serves as the power source for the entire mechanism. It directly drives the upper mold to complete the lifting action through the extension and retraction of the telescopic rod, providing power for mold closing injection and mold opening demolding.

[0020] A slipper zipper injection mold includes a top block and a spring installed in a wedge groove inside the lower mold. Both ends of the spring are fixedly connected to the top block and the lower mold, respectively. The top block and the lower mold are in a sealed sliding connection. A pull rope is inserted into a circular hole on the bottom surface of the lower mold. One end of the pull rope is fixedly connected to the bottom surface of the top block, and the other end of the pull rope is fixedly connected to a square plate. The square plate is fixedly connected to the bottom surface of the lower mold. A pulley is fixedly connected to the bottom surface of the lower mold, and the pull rope fits against the pulley's wheel portion. A support block is fixedly connected to the upper surface of the base.

[0021] By adopting the above technical solution, during injection molding, the support block changes the direction of the pulling force through the pull rope and pulley, pulling the top block to compress the spring, so that the top block is embedded in the wedge groove and forms a smooth curved surface with the mold groove of the lower mold, ensuring that the surface of the injection molded part is flat. During demolding, the rotation of the lower mold makes the pulling force of the support block on the pull rope disappear, the spring returns to its original position and pushes the top block to eject the injection molded part. Combined with the tilting of the lower mold, rapid demolding is achieved, improving product integrity and demolding efficiency. The square plate and the round hole play a fixing and guiding role at the end and middle of the pull rope, respectively, to ensure stable transmission of the pulling force.

[0022] The beneficial effects of this utility model are as follows: the upper mold is lifted by an electric push rod, and the longitudinal toothed rod, gear two, horizontal toothed rod, gear one and other components are linked to form a complete transmission chain, so that the lower mold can automatically complete the rotation action during the mold closing and demolding stages. With the elastic pushing action of the top block and spring, the entire process of slipper zipper from injection molding to automatic demolding is automated, replacing the traditional manual demolding method, reducing manual intervention, reducing labor costs, avoiding the efficiency fluctuations of manual operation, making the production rhythm more stable, and significantly increasing the product output per unit time. When the lower mold is in a horizontal injection state, the support block pulls the ejector block to compress the spring through the pull rope, so that the ejector block and the mold groove of the lower mold form a smooth curved surface. This ensures that the molten plastic can fill the cavity evenly during the injection process, avoiding product defects caused by uneven cavity surfaces. During the demolding stage, the ejector block gently pushes the product under the action of the spring. Combined with the tilting and rotation of the lower mold, this ensures that the product is subjected to uniform force when it leaves the mold, effectively reducing problems such as product deformation and scratches caused by improper demolding methods, and improving the product qualification rate and appearance quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Sectional view at point AA; Figure 3 This utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This utility model Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the longitudinal toothed rod and gear II in this utility model; Figure 6 This is a schematic diagram of the structure of the L-shaped rod and the longitudinal toothed rod in this utility model; Figure 7 This is a schematic diagram of the connecting plate and gear one in this utility model; Figure 8 This is a schematic diagram of the top block and spring in this utility model; Figure 9 This is a schematic diagram of the structure of the U-shaped card block and the L-shaped plate in this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Base; 2. L-shaped plate; 3. Upper mold; 4. Lower mold; 5. Connecting plate; 6. Electric push rod; 7. Gear 1; 8. Side plate; 9. Weight; 10. L-shaped rod; 11. Longitudinal toothed rod; 12. U-shaped locking block; 13. Gear 2; 14. Horizontal toothed rod; 15. Slide groove; 16. Bottom groove; 17. Optical shaft; 18. Top block; 19. Spring; 20. Wedge groove; 21. Round hole; 22. Pull rope; 23. Pulley; 24. Support block; 25. Square plate; 26. Support plate. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings: like Figures 1 to 9 As shown, this embodiment provides an automatic demolding mechanism and a slipper zipper injection mold. An automatic demolding mechanism includes a base 1, an L-shaped plate 2 fixedly connected to the upper surface of the base 1, and an upper mold 3 disposed above the base 1. A lower mold 4 is disposed below the upper mold 3. A transverse toothed rod 14 is inserted into a sliding groove 15 inside the base 1. Gear 13 and gear 7 are meshed on the surface of the transverse toothed rod 14. A longitudinal toothed rod 11 is disposed on one side of the L-shaped plate 2. The upper mold 3 can be raised and lowered. When the upper mold 3 is raised and lowered, it drives the longitudinal toothed rod 11 to move longitudinally. When the longitudinal toothed rod 11 moves longitudinally, it drives the transverse toothed rod 14 to move laterally through gear 13. When the transverse toothed rod 14 moves, it drives gear 7 to rotate. The rotation of gear 7 drives the rotation of the lower mold 4 and realizes the demolding of the slipper zipper. The raising and lowering action of the upper mold 3 is converted into the rotational motion of the lower mold 4 through the sequential transmission of the longitudinal toothed rod 11, gear 13, transverse toothed rod 14, and gear 7. Thus, after injection molding, the lower mold 4 tilts to realize the automatic demolding of the slipper zipper, providing a basis for automated production.

[0026] Two side plates 8 are fixedly connected to the upper surface of the base 1. A gear 7 is set between the two side plates 8. The gear 7 is rotatably connected to the side plates 8 through a rotating shaft. The horizontal gear 14 is slidably connected to the base 1. The side plates 8 play a role in precise positioning and stable support for the gear 7. The rotating shaft enables the gear 7 to rotate flexibly, ensuring that its meshing transmission with the horizontal gear 14 is stable and reliable, and preventing the gear 7 from deviating when under force. The sliding connection between the horizontal gear 14 and the base 1 provides guidance for its lateral movement, ensuring the straightness of the horizontal gear 14 when it moves in the slide groove 15, thereby accurately transmitting power to the gear 7 and ensuring the accuracy of the rotation angle of the lower mold 4.

[0027] A connecting plate 5 is fixedly connected to one side of the lower mold 4. Gear 7 is fixedly connected to the connecting plate 5. Two support plates 26 are fixedly connected to the upper surface of the base 1. The bottom surface of the lower mold 4 is in contact with the support plates 26, which directly transmit the rotational motion of gear 7 to the lower mold 4, so as to realize the synchronous action of the two. The support plates 26 provide support for the lower mold 4 during the injection molding stage, keep the lower mold 4 in a horizontal state, ensure the sealing when it is closed with the upper mold 3, provide a stable cavity environment for injection molding, and limit the excessive rotation of the lower mold 4 to ensure the accuracy of the mold closing position.

[0028] Gear 2 13 is installed in the groove 16 on the bottom surface of L-shaped plate 2. Gear 2 13 is rotatably connected to L-shaped plate 2 via rotating shaft 2. The longitudinal toothed rod 11 and gear 2 13 are meshed together. A U-shaped locking block 12 is fixedly connected to one side of L-shaped plate 2. The longitudinal toothed rod 11 is slidably connected inside the U-shaped locking block 12. The groove 16 and rotating shaft 2 provide installation space and rotational support for gear 2 13, ensuring that gear 2 13 stably receives the longitudinal power of the longitudinal toothed rod 11 and converts it into the lateral power of the transverse toothed rod 14. The U-shaped locking block 12 guides and limits the longitudinal toothed rod 11, preventing it from shifting left or right or wobbling when moving longitudinally, ensuring that it always maintains precise meshing with gear 2 13, and improving transmission efficiency and stability.

[0029] An L-shaped rod 10 is inserted into a square groove on the upper surface of the L-shaped plate 2. A weight 9 is fixedly connected to the upper surface of the L-shaped rod 10. The top end of the longitudinal toothed rod 11 is fixedly connected to the L-shaped rod 10. The L-shaped rod 10 serves as a connecting bridge between the upper mold 3 and the longitudinal toothed rod 11, enabling their linkage. The weight 9 ensures that the lower mold 4 rotates to a horizontal state under the action of gravity, maintaining the continuity of transmission.

[0030] Optical shafts 17 are inserted into the sliding holes on both sides of the upper surface of the L-shaped plate 2. The bottom end of the optical shaft 17 is fixedly connected to the upper mold 3. The optical shaft 17 cooperates with the sliding hole of the L-shaped plate 2 to provide rigid guidance for the lifting and lowering movement of the upper mold 3, restricting the horizontal offset and rotation of the upper mold 3 during the movement process, ensuring that the upper mold 3 always moves smoothly in the vertical direction, thereby ensuring the alignment accuracy when closing with the lower mold 4, and avoiding injection defects or equipment damage caused by the skewness of the upper mold 3.

[0031] An electric push rod 6 is installed in the mounting hole on the upper surface of the L-shaped plate 2. The end of the telescopic rod of the electric push rod 6 is fixedly connected to the upper surface of the upper mold 3. The electric push rod 6 serves as the power source of the entire mechanism. It directly drives the upper mold 3 to complete the lifting action through the extension and retraction of the telescopic rod, providing power for mold closing injection and mold opening demolding.

[0032] A slipper zipper injection mold includes a wedge groove 20 inside the lower mold 4, in which a top block 18 and a spring 19 are installed. Both ends of the spring 19 are fixedly connected to the top block 18 and the lower mold 4, respectively. The top block 18 and the lower mold 4 are in a sealed sliding connection. A pull rope 22 is inserted into a circular hole 21 on the bottom surface of the lower mold 4. One end of the pull rope 22 is fixedly connected to the bottom surface of the top block 18, and the other end of the pull rope 22 is fixedly connected to a square plate 25. The square plate 25 is fixedly connected to the bottom surface of the lower mold 4. A pulley 23 is fixedly connected to the bottom surface of the lower mold 4, and the pull rope 22 fits against the wheel portion of the pulley 23. The upper surface of the base 1 is fixedly connected to... With support block 24 attached, during injection molding, support block 24 changes the direction of tension through pull rope 22 and pulley 23, pulling top block 18 to compress spring 19, so that top block 18 is embedded in wedge groove 20, forming a smooth curved surface with the mold groove of lower mold 4, ensuring the surface of injection molded part is flat. During demolding, lower mold 4 rotates to make the tension of support block 24 on pull rope 22 disappear, spring 19 resets and pushes top block 18 to eject injection molded part. With the tilt of lower mold 4, rapid demolding is achieved, improving product integrity and demolding efficiency. Square plate 25 and round hole 21 play a fixing and guiding role for the end and middle of pull rope 22, respectively, to ensure stable transmission of tension.

[0033] Working principle: When the lower mold 4 is kept horizontal, the bottom surface of the lower mold 4 is in close contact with the support plate 26. The support block 24 on the upper surface of the base 1 applies tension to the pull rope 22. The pull rope 22 is guided along the pulley 23 to pull the top block 18, so that the top block 18 compresses the spring 19 and is fully embedded in the wedge groove 20. The surface of the top block 18 and the mold groove of the lower mold 4 form a smooth curved surface, providing a flat cavity foundation for the injection molding process. During the injection molding stage, the electric push rod 6 is activated, and its telescopic rod extends downward, pushing the upper mold 3 vertically downward along the optical axis 17. During this process, the bottom of the upper mold 3 gradually approaches the lower mold 4. Because the L-shaped rod 10 is in contact with the upper surface of the upper mold 3 under the gravity of the weight block 9, the downward movement of the upper mold 3 causes the L-shaped rod 10 to slide downward synchronously. This, in turn, causes the longitudinal gear 11 to move longitudinally downward along the guide of the U-shaped locking block 12. The longitudinal gear 11 meshes with the second gear 13, and its downward movement is converted into the counterclockwise rotation of the second gear 13. The horizontal toothed rod 14, which is further driven to engage, slides to the right in the slide groove 15. The horizontal toothed rod 14 engages with the gear 7. Its movement causes the gear 7 to rotate counterclockwise. The gear 7 drives the lower mold 4 to rotate synchronously through the connecting plate 5 until the lower mold 4 rotates to a horizontal position, which facilitates the subsequent tight mold closing with the upper mold 3. When the lower mold 4 rotates to a horizontal position, the L-shaped rod 10 and the longitudinal toothed rod 11 can no longer move down. The injection molding equipment injects molten plastic into the closed cavity through the injection hole on the surface of the upper mold 3 to form a slipper pull structure. After injection molding is completed and cooled and solidified, the electric push rod 6 retracts upward, driving the upper mold 3 to rise along the optical axis 17. When the upper mold 3 rises to contact the bottom end of the L-shaped rod 10, it pushes the L-shaped rod 10 and the longitudinal gear 11 to move upward synchronously. The upward movement of the longitudinal gear 11 is converted into the clockwise rotation of the second gear 13. The second gear 13 drives the horizontal gear 14 to slide in the slide groove 15. The horizontal gear 14 meshes with the first gear 7, driving the first gear 7 to rotate clockwise. This, in turn, causes the lower mold 4 to rotate from a horizontal position to an inclined position through the connecting plate 5. As the lower mold 4 rotates, its bottom surface... As the slipper gradually detaches from the support plate 26, the tension of the support block 24 on the pull rope 22 disappears. Under the elastic potential energy of the spring 19, the top block 18 pops out from the wedge groove 20, pushing the formed slipper pull and separating it from the mold groove of the lower mold 4. When the lower mold 4 rotates to a certain tilt angle, under the combined action of gravity and the top block 18, the slipper pull slides out along the tilted surface of the lower mold 4, completing the automatic demolding. After demolding, if the next injection molding is required, the electric push rod 6 drives the upper mold 3 to move down again, and the components of the mechanism reset to the initial state under the transmission action, entering the next working cycle.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of the invention. All such changes and modifications fall within the scope of the invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An automatic demolding mechanism, comprising a base (1), an L-shaped plate (2) fixedly connected to the upper surface of the base (1), and an upper mold (3) disposed above the base (1), characterized in that: Below the upper mold (3) is a lower mold (4). A horizontal toothed rod (14) is inserted into a groove (15) inside the base (1). Gear 2 (13) and gear 1 (7) are meshed on the surface of the horizontal toothed rod (14). A longitudinal toothed rod (11) is provided on one side of the L-shaped plate (2). The upper mold (3) can be raised and lowered. When the upper mold (3) is raised and lowered, it drives the longitudinal toothed rod (11) to move longitudinally. When the longitudinal toothed rod (11) moves longitudinally, it drives the horizontal toothed rod (14) to move laterally through gear 2 (13). When the horizontal toothed rod (14) moves, it can drive gear 1 (7) to rotate. The rotation of gear 1 (7) is used to drive the lower mold (4) to rotate and realize the demolding of the slipper zipper.

2. The automatic demolding mechanism according to claim 1, characterized in that: The upper surface of the base (1) is fixedly connected to two side plates (8), and a gear (7) is provided between the two side plates (8). The gear (7) is rotatably connected to the side plates (8) through a rotating shaft. The transverse gear (14) is slidably connected to the base (1).

3. The automatic demolding mechanism according to claim 1, characterized in that: A connecting plate (5) is fixedly connected to one side of the lower mold (4), the gear (7) is fixedly connected to the connecting plate (5), and two support plates (26) are fixedly connected to the upper surface of the base (1). The bottom surface of the lower mold (4) is attached to the support plates (26).

4. The automatic demolding mechanism according to claim 1, characterized in that: Gear 2 (13) is provided in the bottom groove (16) opened on the bottom surface of the L-shaped plate (2). Gear 2 (13) is rotatably connected to the L-shaped plate (2) through a rotating shaft 2. The longitudinal toothed rod (11) is meshed with gear 2 (13). A U-shaped locking block (12) is fixedly connected to one side of the L-shaped plate (2). The longitudinal toothed rod (11) is slidably connected inside the U-shaped locking block (12).

5. An automatic demolding mechanism according to claim 1, characterized in that: An L-shaped rod (10) is inserted into a square groove on the upper surface of the L-shaped plate (2). A weight (9) is fixedly connected to the upper surface of the L-shaped rod (10). The top end of the longitudinal toothed rod (11) is fixedly connected to the L-shaped rod (10).

6. An automatic demolding mechanism according to claim 1, characterized in that: Optical shafts (17) are respectively inserted into the sliding holes on both sides of the upper surface of the L-shaped plate (2), and the bottom end of the optical shafts (17) is fixedly connected to the upper mold (3).

7. An automatic demolding mechanism according to claim 1, characterized in that: An electric push rod (6) is installed in the mounting hole on the upper surface of the L-shaped plate (2), and the end of the telescopic rod of the electric push rod (6) is fixedly connected to the upper surface of the upper mold (3).

8. A slipper zipper injection mold, employing the automatic demolding mechanism described in any one of claims 1-7, characterized in that: The lower mold (4) has a wedge groove (20) inside which a top block (18) and a spring (19) are provided. The two ends of the spring (19) are fixedly connected to the top block (18) and the lower mold (4) respectively. The top block (18) and the lower mold (4) are sealed and slidably connected. A pull rope (22) is inserted into a round hole (21) on the bottom surface of the lower mold (4). One end of the pull rope (22) is fixedly connected to the bottom surface of the top block (18). The other end of the pull rope (22) is fixedly connected to a square plate (25). The square plate (25) is fixedly connected to the bottom surface of the lower mold (4). A pulley (23) is fixedly connected to the bottom surface of the lower mold (4). The pull rope (22) fits against the wheel part of the pulley (23). A support block (24) is fixedly connected to the upper surface of the base (1).

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