Mandrel for clamping product through expansive force

Abstract

The utility model relates to the technical field of expansive force mandrels, and discloses a mandrel for clamping a product through expansive force, which comprises a base and further comprises a coupling disc arranged at the top of the base, the inner wall of the coupling disc is as wide as the inner wall of the base, the inner wall of the coupling disc is connected with a mandrel body in a sliding mode, and the mandrel body is connected with the base in a sliding mode. The base, the coupling disc and a protrusion and a groove which are arranged on the inner wall of the mandrel body are used in a matched mode, the stability of the main body can be improved conveniently, the clamping buckles, the opening and closing blocks, the conical shaft and the driving mechanism are arranged, the clamping buckles are arranged on the inner wall of the mandrel body, and the clamping buckles are arranged on the inner wall of the mandrel body. And meanwhile, the clamping arrangement of the opening and closing block and the core shaft body is matched with the coupling disc for use, so that the problem that the clamping force of the device on the product is not uniform or the clamping is not stable due to the fact that the friction force between the conical shaft and the inner wall of the clamping piece is insufficient is avoided.

Description

Technical Field

[0001] This utility model relates to the field of expansion mandrel technology, specifically a mandrel that clamps products by expansion force. Background Technology

[0002] The expansion mandrel is an internal hole positioning and tightening fixture used by lathe operators when machining components on a lathe. It has a clamping body, one end of which is a clamping part, and the other end is a deformation and tightening end. The exterior of the deformation and tightening end has a positioning point and an expansion clamping point, and a stress groove is opened between the positioning point and the expansion clamping point. An expansion screw is screwed into the interior of the deformation and tightening end, and the cap of the expansion screw is truncated cone-shaped.

[0003] In modern manufacturing, with the continuous improvement of product precision, the requirements for clamping technology are becoming increasingly stringent. In order to improve the processing accuracy of products and meet the needs of high-precision processing, a mandrel that clamps products by means of expansion force is needed to achieve uniform clamping of products. When existing expansion mandrels clamp the clamping parts, the conical shaft squeezes the inner wall of the clamping part. Generally, the outer wall of the conical shaft is relatively smooth, which makes the friction between the conical shaft and the inner wall of the clamping part insufficient. This will lead to uneven or unstable clamping force on the product by the device, resulting in a decrease in the processing accuracy of the product by the device. Utility Model Content

[0004] The purpose of this invention is to provide a mandrel that clamps products using expansion force, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mandrel for clamping products by expansion force, comprising a base, and further comprising:

[0006] A coupling disc is set on the top of the base, and the inner wall width of the coupling disc is the same as the inner wall width of the base. A mandrel body is slidably connected to the inner wall of the coupling disc, and a positioning groove is opened at the bottom of the mandrel body. Four buckles are snapped on the inner wall of the mandrel body, and the four buckles are evenly distributed on the outer side of the mandrel body. Four sets of tensioning blocks are set on the top of the mandrel body, and the tensioning blocks are connected to the mandrel body through buckles.

[0007] A connecting plate is fixed to the inner wall of the coupling disc. A sliding plate is fixedly arranged symmetrically on the outer side of the connecting plate, and the outer side of the sliding plate is slidably connected to the inner wall of the mandrel. A conical shaft is provided on the top of the connecting plate, and the outer side of the conical shaft is slidably connected to the inner wall of the tensioning block. A drive mechanism for driving the main body to run is provided inside the base.

[0008] Preferably, the driving mechanism includes a cylinder vertically mounted on the inner wall of the base, the piston rod of the cylinder being fixedly connected to a lifting block, and the lifting block being positioned in a positioning groove opened at the bottom of the spindle body.

[0009] Preferably, a limiting plate is provided at the top of the inner wall of the coupling disc, and the limiting plate is a ring design. The inner wall of the limiting plate is provided with six sets of first fixing bolts, and the outer sides of the six sets of first fixing bolts are threaded to the inner wall of the coupling disc.

[0010] Preferably, a nut is provided inside the space formed by the closing of the tension block, and a vertically arranged lead screw is fixed to the bottom of the nut. The bottom end of the lead screw is threadedly connected to the inner wall of the connecting plate. A threaded hole is opened on the inner wall of the tapered shaft, and the inner wall of the threaded hole is threadedly engaged with the outer side of the lead screw.

[0011] Preferably, the top of the coupling disc is provided with a chuck, the inner circle size of the chuck is smaller than the outer edge size of the tension block, and the inner wall of the chuck is evenly provided with six sets of first mounting holes. The inner wall of each of the six sets of first mounting holes is provided with a second fixing bolt, and the bottom end of the second fixing bolt is threaded to the inner wall of the coupling disc.

[0012] Preferably, the inner wall of the coupling disc is provided with six sets of second mounting holes, and each of the six sets of second mounting holes is provided with a threaded post, and the bottom end of the threaded post is threadedly connected to the inner wall of the base.

[0013] Preferably, three mounting blocks are fixed on the outer side of the base, and the three mounting blocks are evenly distributed. The inner walls of the three mounting blocks are provided with positioning holes.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention improves the stability of the main body by using protrusions and grooves on the inner wall of the base, coupling disc, and mandrel to fit together. By setting up buckles, tension blocks, conical shafts, and drive mechanisms, it is easy to clamp the product to be processed by expansion force. At the same time, the snap-fit ​​setting of the tension blocks and mandrel body and the coupling disc fit together to avoid insufficient friction between the conical shaft and the inner wall of the clamping parts, which would lead to uneven clamping force or unstable clamping of the product. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the mandrel that clamps products by expansion force according to this utility model;

[0017] Figure 2 A schematic diagram of the drive mechanism structure provided by this utility model;

[0018] Figure 3A schematic diagram of the mandrel structure provided by this utility model;

[0019] Figure 4 A schematic diagram of the conical shaft structure provided by this utility model.

[0020] In the diagram: 1. Base; 2. Coupling disc; 3. Mandrel body; 4. Buckle; 5. Tensioning block; 6. Connecting plate; 7. Tapered shaft; 8. Drive mechanism; 81. Cylinder; 82. Lifting block; 9. Limiting plate; 10. First fixing bolt; 11. Nut; 12. Lead screw; 13. Threaded hole; 14. Chuck; 15. First mounting hole; 16. Second fixing bolt; 17. Second mounting hole; 18. Threaded post; 19. Mounting block; 20. Positioning hole; 21. Slide plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 As shown, a mandrel for clamping products by expansion force includes a base 1. A coupling disk 2 is provided on the top of the base 1, and the inner wall width of the coupling disk 2 is the same as the inner wall width of the base 1. A mandrel body 3 is slidably connected to the inner wall of the coupling disk 2, and a positioning groove is provided at the bottom of the mandrel body 3. At the same time, a sliding groove is provided on the inner wall of the mandrel body 3. Four buckles 4 are snapped on the inner wall of the mandrel body 3, and the four buckles 4 are evenly distributed on the outer side of the mandrel body 3. Four sets of tensioning blocks 5 are provided on the top of the mandrel body 3, and the tensioning blocks 5 are connected to the mandrel body 3 by means of tensioning. The base 1 is connected to the mandrel 3 via the buckle 4. The base 1 supports the coupling plate 2 on top of it and protects the drive mechanism 8 inside. The coupling plate 2 limits the mandrel 3 through the groove inside. The four sets of buckles 4 can respectively engage the four sets of tensioning blocks 5 with the mandrel 3. By setting the tensioning blocks 5, it is easy to move downward along the outside of the tapered shaft 7, thereby fixing the product with a circular inner diameter by expanding outward through the expansion force.

[0023] A connecting plate 6 is fixed to the inner wall of the coupling disc 2, and the inner wall of the connecting plate 6 is provided with threaded holes. A sliding plate 21 is fixed to the outer side of the connecting plate 6, and the outer side of the sliding plate 21 is slidably connected to the inner wall of the mandrel body 3. At the same time, the inner wall of the mandrel body 3 is provided with a sliding groove and is slidably connected to the sliding plate 21. A conical shaft 7 is provided at the top of the connecting plate 6, and the outer side of the conical shaft 7 is slidably connected to the inner wall of the tension block 5. The base 1 is provided with a drive mechanism 8 for driving the main body to run. The connecting plate 6 can support the conical shaft 7 at its top by being fixedly connected to the inner wall of the mandrel body 3 by the outer sliding plate. The conical shaft 7 can cause the tension block 5, which is attached to its outer side, to expand outward and fit tightly against the inner wall of the workpiece to be fixed, so as to achieve the purpose of fixing the workpiece. By providing the drive mechanism 8, the mandrel body 3 can be moved downward by the cooperation of its internal structure.

[0024] The drive mechanism 8 includes a cylinder 81 vertically mounted on the inner wall of the base 1. The piston rod of the cylinder 81 is fixedly connected to a lifting block 82, and the lifting block 82 is set in a positioning groove opened at the bottom of the spindle body 3. It should be noted that the lower part of the lifting block 82 is cylindrical and the upper part is conical. By setting the cylinder 81, it is easy to drive the lifting block 82, which is fixed at one end of its piston rod, to move. The lifting block 82 can fit into the positioning groove opened at the bottom of the spindle body 3. At the same time, the cylinder 81 drives the spindle body 3 to move downward.

[0025] A limiting plate 9 is provided on the top of the inner wall of the coupling plate 2. The limiting plate 9 is a ring design. Six sets of first fixing bolts 10 are provided on the inner wall of the limiting plate 9, and the outer sides of the six sets of first fixing bolts 10 are threaded to the inner wall of the coupling plate 2. It should be noted that the inner ring size of the limiting plate 9 is larger than that of the spindle body 3 but smaller than that of the coupling plate 2. This design can shield the spindle body 3 and prevent the spindle body 3 from derailing during operation. The setting of multiple sets of first fixing bolts 10 can connect the limiting plate 9 and the coupling plate 2 from different directions, improving the stability of the limiting plate 9. A nut 11 is provided inside the space formed by the closing of the tension block 5. A vertically arranged lead screw 12 is fixed to the bottom of the nut 11, and the bottom end of the lead screw 12 is threaded to the inner wall of the connecting plate 6. A threaded hole 13 is opened on the inner wall of the tapered shaft 7. The inner wall of the threaded hole 13 is threadedly engaged with the outer side of the lead screw 12. The setting of the nut 11 can be used to... When the hex wrench is turned, the lead screw 12 can be turned into the threaded hole 13 by rotating the nut 11 until the thread is connected to the inner wall of the connecting plate 6, thereby fixing the tapered shaft 7 to the top of the connecting plate 6. The top of the coupling plate 2 is provided with a chuck 14. The inner circle size of the chuck 14 is smaller than the outer edge size of the tension block 5. Since the inner circle of the chuck 14 is smaller than the size of the tension block 5 after assembly, the setting of the chuck 14 will not affect the normal operation of the device. The inner wall of the chuck 14 is evenly provided with six sets of first mounting holes 15. The inner wall of each of the six sets of first mounting holes 15 is provided with a second fixing bolt 16, and the bottom end of the second fixing bolt 16 is threaded to the inner wall of the coupling plate 2. The setting of multiple sets of first mounting holes 15 can place multiple sets of second fixing bolts 16, so that the device can fix the chuck 14 and the coupling plate 2 from different angles by the second fixing bolts 16, thereby improving the stability of the device.

[0026] The inner wall of the coupling disc 2 has six sets of second mounting holes 17, and each of the six sets of second mounting holes 17 has a threaded post 18 inside. The bottom end of the threaded post 18 is threaded to the inner wall of the base 1. The multiple sets of second mounting holes 17 can accommodate multiple sets of threaded posts 18, allowing the device to connect the coupling disc 2 and the base 1 from multiple directions via the threaded posts 18. Three mounting blocks 19 are fixed on the outer side of the base 1, and the three mounting blocks 19 are evenly distributed. The inner wall of each of the three mounting blocks 19 has a positioning hole 20. The three mounting blocks 19 are evenly distributed and combined into a triangular shape. The triangular structure can improve the stability of the main body, and the positioning hole 20 can connect the main body to the worktable with screws.

[0027] Working principle: In use, the round product to be processed is first placed outside the tension block 5. Then, the cylinder 81 is activated, which drives the lifting block 82 to move downward. The lifting block 82, through the protrusion on its outer side, engages with the positioning groove at the bottom of the mandrel 3, thereby driving the mandrel 3 to move downward. The mandrel 3 pulls the tension block 5, which is engaged by the buckle 4, downward. At the same time, because the inner circle size of the chuck 14 is smaller than the outer edge size of the closed tension block 5, the tension block 5 can be limited without affecting the tension. In normal use, the tension block 5 moves downward along the oblique path of the conical shaft 7, thereby causing the four sets of tension blocks 5 to expand outward, thus clamping the round product to be processed by the expansion force. During the movement of the mandrel body 3, the limiting plate 9 is fixed to the inner wall of the coupling plate 2 by the first fixing bolt 10, thereby limiting the mandrel body 3. At the same time, the coupling plate 2 is fixed by multiple sets of threaded columns 18, and the chuck 14 is fixed by multiple sets of second fixing bolts 16, thus effectively improving the stability of the main body.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mandrel for clamping products by means of expansion force, comprising a base (1), characterized in that, Also includes: A coupling disc (2) is set on the top of the base (1), and the inner wall width of the coupling disc (2) is the same as the inner wall width of the base (1). The inner wall of the coupling disc (2) is slidably connected to a spindle body (3), and a positioning groove is provided at the bottom of the spindle body (3). Four buckles (4) are snapped on the inner wall of the spindle body (3). The four buckles (4) are evenly distributed on the outside of the spindle body (3). Four sets of tensioning blocks (5) are set on the top of the spindle body (3), and the tensioning blocks (5) are connected to the spindle body (3) through the buckles (4). A connecting plate (6) is fixed to the inner wall of the coupling disc (2). A sliding plate (21) is fixedly arranged symmetrically on the outer side of the connecting plate (6). The outer side of the sliding plate (21) is slidably connected to the inner wall of the spindle body (3). A conical shaft (7) is provided on the top of the connecting plate (6). The outer side of the conical shaft (7) is slidably connected to the inner wall of the tension block (5). A drive mechanism (8) for driving the main body to run is provided inside the base (1).

2. The mandrel for product clamping by expansion force according to claim 1, characterized in that: The drive mechanism (8) includes a cylinder (81) installed vertically on the inner wall of the base (1). The piston rod of the cylinder (81) is fixedly connected to a lifting block (82), and the lifting block (82) is located in a positioning groove opened at the bottom of the spindle body (3).

3. The mandrel for product clamping by expansion force according to claim 1, characterized in that: The inner wall of the coupling disc (2) is provided with a limiting plate (9), and the limiting plate (9) is a ring design. The inner wall of the limiting plate (9) is provided with six sets of first fixing bolts (10), and the outer sides of the six sets of first fixing bolts (10) are threadedly connected to the inner wall of the coupling disc (2).

4. A mandrel for clamping products by expansion force according to claim 1, characterized in that: A nut (11) is provided inside the space formed by the closing of the tension block (5). A vertically arranged lead screw (12) is fixed at the bottom of the nut (11), and the bottom end of the lead screw (12) is threadedly connected to the inner wall of the connecting plate (6). A threaded hole (13) is opened on the inner wall of the tapered shaft (7), and the inner wall of the threaded hole (13) is threadedly engaged with the outer side of the lead screw (12).

5. A mandrel for clamping products by expansion force according to claim 1, characterized in that: The top of the coupling disc (2) is provided with a chuck (14). The inner circle size of the chuck (14) is smaller than the outer edge size of the tension block (5). The inner wall of the chuck (14) is evenly provided with six sets of first mounting holes (15). The inner wall of each of the six sets of first mounting holes (15) is provided with a second fixing bolt (16), and the bottom end of the second fixing bolt (16) is threadedly connected to the inner wall of the coupling disc (2).

6. A mandrel for clamping products by expansion force according to claim 1, characterized in that: The inner wall of the coupling disc (2) is provided with six sets of second mounting holes (17), and each of the six sets of second mounting holes (17) is provided with a threaded post (18), and the bottom end of the threaded post (18) is threadedly connected to the inner wall of the base (1).

7. A mandrel for clamping products by expansion force according to claim 1, characterized in that: Three mounting blocks (19) are fixed on the outer side of the base (1), and the three mounting blocks (19) are evenly distributed. The inner walls of the three mounting blocks (19) are provided with positioning holes (20).

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