Bidirectional locking expansion sleeve

Abstract

The utility model relates to the technical field of expansion sleeves, in particular to a two-way locking expansion sleeve which comprises an outer sleeve and an inner sleeve, two ends of the outer sleeve are connected with two ends of the inner sleeve, an extrusion seam is arranged between the outer sleeve and the inner sleeve, two hydraulic cavities are arranged at two ends of the inner side of the outer sleeve, extrusion blocks are arranged in the two hydraulic cavities, and the two hydraulic cavities are connected with the extrusion seam. The outer side, close to the two hydraulic cavities, of the outer sleeve is in threaded connection with two oil sealing plugs, an oil injection head is arranged on the outer side of the outer sleeve, and the two ends of the outer sleeve are fixedly connected with two adjusting pipes. The device has the beneficial effects that the extrusion block is extruded into the extrusion seam through hydraulic oil, the purpose of fine adjustment of the expansion degree is achieved, the hydraulic oil is used as a medium, force can be evenly transmitted to the annular face of the whole extrusion block, compared with a traditional bolt screwing mode, stress is more uniform, precision is higher, bolts do not need to be screwed one by one, and the cost is reduced. And meanwhile, the whole extrusion block is driven to extrude inwards, the expansion speed is high, and efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of expansion sleeves, in particular to a bidirectional locking expansion sleeve. Background Art

[0002] The expansion sleeve, referred to as the expansion sleeve, is an advanced basic component widely used in the world today for mechanical connections under heavy loads. In the connection between wheels and shafts, it is a keyless connection device that transmits loads by tightening high-strength bolts to generate pressure and friction between the containing surfaces. The expansion sleeve is a device used to connect and fix mechanical parts. Its function is to provide fastening force through the expansion of materials to ensure the safety and stability of the parts. The structure of the expansion sleeve consists of a hollow cylindrical shell with a threaded or raised structure inside to increase friction. Its working principle is that after applying external force, the diameter of the expansion sleeve changes, forming a close contact with the hole wall or connecting parts to form a reliable fixed connection.

[0003] Existing expansion sleeves require tightening bolts one by one to expand the outer sleeve and the inner sleeve, change the diameter of the outer sleeve and the inner sleeve, and use friction to connect the shaft and the expansion sleeve. However, there are a large number of bolts, and the speed is slow during disassembly and assembly. When installing the expansion sleeve, the bolts need to be tightened one by one in diagonal order. This method may cause jamming or uneven force on the expansion sleeve. For some machine tools that require tight transmission and connection, it cannot meet the connection requirements. Utility Model Content

[0004] The purpose of the utility model is to provide a bidirectional locking expansion sleeve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bidirectional locking expansion sleeve, the bidirectional locking expansion sleeve comprising an outer sleeve and an inner sleeve, the two ends of the outer sleeve are connected to the two ends of the inner sleeve, an extrusion seam is provided between the outer sleeve and the inner sleeve, two hydraulic chambers are provided at the inner ends of the outer sleeve, extrusion blocks are provided inside the two hydraulic chambers, two oil sealing plugs are threadedly connected to the outer side of the outer sleeve near the two hydraulic chambers, an oil filling head is provided on the outer side of the outer sleeve, and two adjusting tubes are fixedly connected to the two ends of the outer sleeve.

[0006] Preferably, there are two oiling heads, and the two oiling heads are respectively connected to the two hydraulic chambers, and the two oiling heads are respectively located on the outer arc surface and the end surface of the outer sleeve.

[0007] Preferably, the inner wall of the oil filling head is fixedly connected with a hollow frame, and a spring and a limit cylinder are fixedly connected to one side of the middle of the hollow frame, the spring is located on the inner side of the limit cylinder, and a hole is opened in the middle of one end of the limit cylinder away from the hollow frame.

[0008] Preferably, one end of the spring away from the hollow frame is connected to one side of the limit plate, and the other side of the limit plate is fixedly connected to a sliding rod, which is slidably connected in the limit cylinder, and the outer diameter of the sliding rod is consistent with the inner diameter of the hole in the end face of the limit cylinder.

[0009] Preferably, a blocking ball is fixedly connected to one end of the sliding rod away from the limiting cylinder, a fixing plate is provided on one side of the blocking ball away from the limiting cylinder, and an oil inlet hole is opened in the middle of the fixing plate.

[0010] Preferably, the fixing plate is welded between the inner walls of the oil filling head, and a sealing plug is attached to one side of the fixing plate, and the sealing plug is threadedly connected to the inner side of the port of the oil filling head.

[0011] Preferably, the two adjusting tubes are respectively connected to the two hydraulic chambers, and the insides of the two adjusting tubes are threadedly connected with adjusting top screws, and two sealing rings are provided on the outer sides of the adjusting top screws.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the adjusting top screw is screwed by a tool to move the adjusting top screw in the adjusting tube, and when the adjusting top screw slides along the inner wall of the adjusting tube, the internal space of the hydraulic chamber can be changed, so that the extrusion block is squeezed into the extrusion gap by the hydraulic oil, so as to achieve the purpose of fine-tuning the expansion degree. The hydraulic oil is used as a medium, and the force can be evenly transmitted to the annular surface of the entire extrusion block. Compared with the traditional bolt tightening method, the force is more uniform and the precision is higher, and the synchronous movement of the entire extrusion block will not be stuck. At the same time, the expansion sleeve adopts a two-way expansion structure. When the expansion sleeve is tightened, the hydraulic oil is mainly used to push the extrusion block to move into the extrusion gap, so as to expand the extrusion gap. There is no need to tighten the bolts one by one, and at the same time, the entire extrusion block is driven to be squeezed inward, and the expansion speed is fast and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model when viewed from above;

[0015] Figure 3 For this utility model Figure 2 A in the figure is an enlarged schematic diagram of the three-dimensional structure;

[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model in front view;

[0017] Figure 5 For this utility model Figure 4 The enlarged schematic diagram of the three-dimensional structure is shown in Figure 1.

[0018] In the figure: 1, outer sleeve; 2, inner sleeve; 3, extrusion seam; 4, hydraulic chamber; 5, extrusion block; 6, oil sealing plug;

[0019] 7. Oil filling head; 701. Hollow frame; 702. Spring; 703. Limiting cylinder; 704. Limiting plate; 705. Sliding rod; 706. Blocking ball; 707. Fixed plate; 708. Oil inlet hole; 709. Sealing plug; 8. Adjusting tube; 801. Adjusting top screw; 802. Sealing ring. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1

[0022] See also Figure 1-Figure 5 The utility model provides a technical solution: a bidirectional locking expansion sleeve, the bidirectional locking expansion sleeve comprises an outer sleeve 1 and an inner sleeve 2, the two ends of the outer sleeve 1 are connected to the two ends of the inner sleeve 2, an extrusion seam 3 is provided between the outer sleeve 1 and the inner sleeve 2, two hydraulic chambers 4 are provided at the inner ends of the outer sleeve 1, and extrusion blocks 5 are provided inside the two hydraulic chambers 4. The outer side of the outer sleeve 1 near the two hydraulic chambers 4 is threadedly connected with two oil sealing plugs 6, an oil filling head 7 is provided on the outside of the outer sleeve 1, and two adjusting tubes 8 are fixedly connected at both ends of the outer sleeve 1.

[0023] Embodiment 2

[0024] On the basis of the first embodiment, the number of the oiling heads 7 is two, and the two oiling heads 7 are respectively connected to the two hydraulic chambers 4, and the two oiling heads 7 are respectively located on the outer arc surface and the end surface of the outer sleeve 1, and the inner wall of the oiling head 7 is fixedly connected with a hollow frame 701, and the middle side of the hollow frame 701 is respectively fixedly connected with a spring 702 and a limit cylinder 703, the spring 702 is located on the inner side of the limit cylinder 703, and the middle part of the limit cylinder 703 away from the hollow frame 701 is provided with a hole, and the end of the spring 702 away from the hollow frame 701 is connected to one side of the limit plate 704 The other side of the limiting plate 704 is fixedly connected with a sliding rod 705, which is slidably connected in the limiting cylinder 703, and the outer diameter of the sliding rod 705 is consistent with the inner diameter of the hole at the end of the limiting cylinder 703. The end of the sliding rod 705 away from the limiting cylinder 703 is fixedly connected with a blocking ball 706, and a fixing plate 707 is provided on the side of the blocking ball 706 away from the limiting cylinder 703. The middle part of the fixing plate 707 is provided with an oil inlet hole 708, and the fixing plate 707 is welded between the inner walls of the oiling head 7, and a sealing plug 709 is attached to one side of the fixing plate 707. The plug 709 is threadedly connected to the inner side of the port of the oil filling head 7; when using it for the first time, open the sealing plug 709. Then connect the external oil filling pipe to the oil filling head 7 on the outer sleeve 1, and then inject hydraulic oil into the two hydraulic chambers 4 through the oil filling head 7 respectively. When injecting oil, the hydraulic oil flows from the oil inlet hole 708 to the blocking ball 706. The pressure during oil injection will push the blocking ball 706 open, separate the blocking ball 706 from the fixing plate 707 and squeeze the spring 702. The hydraulic oil will enter the hydraulic chamber 4 from the hollow part of the hollow frame 701. The hydraulic oil enters the liquid After the compression chamber 4 is pressed, the extrusion block 5 will be squeezed into the extrusion gap 3, thereby expanding the extrusion gap 3 and changing the diameters of the outer sleeve 1 and the inner sleeve 2, so that the outer sleeve 1 and the inner sleeve 2 are tightly fitted to the surface of the external connecting component for locking. After the oil filling is completed, the spring 702 rebounds to reset the blocking ball 706, so that the blocking ball 706 fits into the groove on one side of the fixed plate 707, and the oil inlet hole 708 is closed. Finally, the sealing plug 709 is screwed back into the oil filling head 7. This method of tightening does not require tightening the bolts one by one, and at the same time drives the entire extrusion block 5 to be squeezed inward, with a fast tightening speed and high efficiency.

[0025] Embodiment 3

[0026] On the basis of the second embodiment, the two adjusting tubes 8 are respectively connected to the two hydraulic chambers 4, and the insides of the two adjusting tubes 8 are both threadedly connected with adjusting top screws 801, and the outer sides of the adjusting top screws 801 are provided with two sealing rings 802; when it is necessary to fine-tune the expansion tightness according to actual needs, the adjusting top screws 801 can be screwed with a tool to move the adjusting top screws 801 in the adjusting tubes 8, and when the adjusting top screws 801 slide along the inner wall of the adjusting tubes 8, the internal space of the hydraulic chamber 4 can be changed, so that the extrusion block 5 is squeezed into the extrusion gap 3 by the hydraulic oil, so as to achieve In order to fine-tune the expansion degree, hydraulic oil is used as a medium to evenly transmit force to the annular surface of the entire extrusion block 5. Compared with the traditional bolt tightening method, the force is more evenly applied and the precision is higher, and the entire extrusion block 5 moves synchronously without getting stuck. At the same time, the expansion sleeve adopts a two-way expansion structure. Compared with the unidirectional expansion sleeve, this structure can increase the expansion area in the middle of the expansion sleeve, thereby increasing the contact area between the expansion sleeve and the shaft. The increase in contact area will increase the friction force, so that the connection effect is better and the load that can be borne is greater.

[0027] In actual use, the shaft to be connected is passed through the middle of the inner sleeve 2, the outer sleeve 1 is placed in the middle of the external cylindrical hole, and the sealing plug 709 is opened. Then the external oil filling pipe is connected to the oil filling head 7 on the outer sleeve 1, and then hydraulic oil is injected into the two hydraulic chambers 4 through the oil filling head 7. During oil injection, the hydraulic oil flows from the oil inlet hole 708 to the blocking ball 706. The pressure during oil injection will push the blocking ball 706 open, separate the blocking ball 706 from the fixing plate 707 and squeeze the spring 702, and the hydraulic oil will The hydraulic oil enters the hydraulic chamber 4 from the hollow part of the hollow frame 701. After entering the hydraulic chamber 4, the hydraulic oil will squeeze the extrusion block 5 into the extrusion gap 3, thereby expanding the extrusion gap 3, changing the diameter of the outer sleeve 1 and the inner sleeve 2, so that the outer sleeve 1 and the inner sleeve 2 are tightly fitted to the surface of the external connecting component for locking. After the oil filling is completed, the spring 702 rebounds to reset the blocking ball 706, so that the blocking ball 706 fits into the groove on one side of the fixing plate 707, and the oil inlet hole 708 is closed. Finally, the sealing plug 709 is screwed back into the oil filling head. 7. This method of tightening does not require tightening the bolts one by one, and at the same time drives the entire extrusion block 5 to be squeezed inward, with fast tightening speed and high efficiency. When it is necessary to fine-tune the expansion degree according to actual needs, a tool can be used to screw the adjusting top screw 801 to make the adjusting top screw 801 move in the adjusting tube 8. When the adjusting top screw 801 slides along the inner wall of the adjusting tube 8, the internal space of the hydraulic chamber 4 can be changed, so that the extrusion block 5 is squeezed into the extrusion gap 3 by using hydraulic oil, so as to achieve the purpose of fine-tuning the expansion degree. By using hydraulic oil as a medium, the force can be evenly transmitted to the annular surface of the entire extrusion block 5. Compared with the traditional bolt tightening method, the force is more evenly applied and the precision is higher, and the entire extrusion block 5 moves synchronously without getting stuck. At the same time, the expansion sleeve adopts a two-way expansion structure. Compared with the expansion sleeve with unidirectional expansion, the structure can increase the expansion area in the middle of the expansion sleeve, thereby increasing the contact area between the expansion sleeve and the shaft. The increase in contact area will increase the friction force, so that the connection effect is better and the load that can be borne is greater.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-way locking expansion sleeve, characterized in that: The bidirectional locking expansion sleeve comprises an outer sleeve (1) and an inner sleeve (2), the two ends of the outer sleeve (1) are connected to the two ends of the inner sleeve (2), an extrusion seam (3) is provided between the outer sleeve (1) and the inner sleeve (2), two hydraulic chambers (4) are provided at the two ends of the inner side of the outer sleeve (1), and extrusion blocks (5) are provided inside the two hydraulic chambers (4), the outer side of the outer sleeve (1) near the two hydraulic chambers (4) is threadedly connected to two oil sealing plugs (6), the outer side of the outer sleeve (1) is provided with an oil filling head (7), and the two ends of the outer sleeve (1) are fixedly connected to two adjustment tubes (8).

2. A bidirectional locking expansion sleeve according to claim 1, characterized in that: There are two oiling heads (7), and the two oiling heads (7) are respectively connected to the two hydraulic chambers (4). The two oiling heads (7) are respectively located on the outer arc surface and the end surface of the outer sleeve (1).

3. A bidirectional locking expansion sleeve according to claim 1, characterized in that: The inner wall of the oil filling head (7) is fixedly connected to a hollow frame (701), and a spring (702) and a limiting cylinder (703) are respectively fixedly connected to one side of the middle of the hollow frame (701), the spring (702) is located on the inner side of the limiting cylinder (703), and a hole is opened in the middle of one end of the limiting cylinder (703) away from the hollow frame (701).

4. A bidirectional locking expansion sleeve according to claim 3, characterized in that: One end of the spring (702) away from the hollow frame (701) is connected to one side of the limiting plate (704), and the other side of the limiting plate (704) is fixedly connected with a sliding rod (705). The sliding rod (705) is slidably connected in the limiting cylinder (703), and the outer diameter of the sliding rod (705) is consistent with the inner diameter of the hole at the end of the limiting cylinder (703).

5. A bidirectional locking expansion sleeve according to claim 4, characterized in that: One end of the sliding rod (705) away from the limiting cylinder (703) is fixedly connected to a blocking ball (706), and a fixing plate (707) is provided on the side of the blocking ball (706) away from the limiting cylinder (703), and an oil inlet hole (708) is opened in the middle of the fixing plate (707).

6. A bidirectional locking expansion sleeve according to claim 5, characterized in that: The fixing plate (707) is welded between the inner walls of the oil filling head (7), and a sealing plug (709) is attached to one side of the fixing plate (707), and the sealing plug (709) is threadedly connected to the inner side of the port of the oil filling head (7).

7. A bidirectional locking expansion sleeve according to claim 1, characterized in that: The two adjusting tubes (8) are respectively connected to the two hydraulic chambers (4), and the insides of the two adjusting tubes (8) are both threadedly connected with adjusting top screws (801), and the outer sides of the adjusting top screws (801) are provided with two sealing rings (802).

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