Mechanical expansion shaft

Abstract

The utility model relates to a mechanical expansion shaft, and belongs to the field of coiled material processing equipment, the mechanical expansion shaft comprises a shaft rod, expansion sleeves, an expansion core body, a first locking nut and a second locking nut, the periphery of the middle of the shaft rod is sleeved with the expansion sleeves in a limiting mode, and the multiple expansion sleeves are continuously arranged in the axial direction; an expansion core body is arranged between the expansion sleeve and the shaft rod in a sleeved mode and comprises an extrusion block, and a guide inclined face is arranged on the extrusion block. The guide inclined surfaces are in one-to-one correspondence with the expansion sleeves; the expansion core body is connected with the shaft rod in a sliding mode, a first locking nut and a second locking nut are installed on the shaft rod at the two axial ends of the expansion core body in an adjusting mode respectively, and the first locking nut and the second locking nut are used for adjusting the axial position of the expansion core body. The mechanical expansion shaft is suitable for various scenes, has obvious advantages in an air-source-free environment, is better in stability in an environment with large temperature and humidity changes, and has great significance in expanding the application scenes of the expansion shaft and promoting the development of the expansion shaft industry. The mechanical expansion shaft is of a mechanical structure, parts have higher precision during production and manufacturing, fine adjustment can be carried out, and the mechanical expansion shaft has huge application value in precise instruments.

Description

Technical Field

[0001] The present application belongs to the field of coil processing equipment and relates to an expansion shaft, specifically a mechanical expansion shaft. Background Art

[0002] The inflatable shaft is a shaft product commonly used in industrial fields such as printing and coating. Its main working principle is to use compressed air to fix and release the shaft core. An inflatable sealing element (airbag) is used inside the inflatable shaft. When high-pressure compressed air is filled into it, the element will expand rapidly, thereby tightly clamping the shaft core. In this way, the material to be processed can be tensioned on the shaft for subsequent processing. When the shaft core needs to be replaced or removed, just discharge the compressed air in the shaft, the sealing element will shrink rapidly, and the shaft core can be easily removed. The inflatable shaft has a wide range of uses. Any machine that has winding, unwinding, and slitting can be used for inflatable shafts, such as: printing industry, steel and metallurgical industry, textile industry, medical equipment manufacturing industry, packaging industry, etc.

[0003] However, ordinary pneumatic shafts still cannot meet the needs in practical applications. Ordinary pneumatic shafts are mainly filled with gas inside, and achieve the purpose of transmitting torque through expansion and contraction, resulting in limited load capacity. They are only suitable for some occasions with smaller loads, such as light loads, low speeds, or scenes with low precision requirements. Because it relies on gas expansion to work, its accuracy is poor, the working length is limited, and too long will affect its stability. In addition, the internal filling gas is sensitive to the environment. If the temperature or humidity in the surrounding environment changes greatly, the performance of the pneumatic shaft will be significantly reduced. Therefore, there is an urgent practical need to develop a mechanical expansion shaft without airbags. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present application proposes a mechanical expansion shaft with strong load capacity and stable and reliable operation.

[0005] The present application solves the technical problem by adopting the following technical solutions:

[0006] A mechanical expansion shaft comprises a shaft rod, an expansion sleeve, an expansion core body, a first locking nut and a second locking nut. The expansion sleeve is provided on the outer peripheral limiting sleeve in the middle of the shaft rod, and the expansion sleeve is a plurality of expansion sleeves arranged continuously in the axial direction; the expansion core body is provided between the expansion sleeve and the shaft rod, and the expansion core body comprises an extrusion block, and a guide inclined surface is provided on the extrusion block; the guide inclined surface corresponds to the expansion sleeve one by one; the expansion core body is slidably connected to the shaft rod, and the first locking nut and the second locking nut are respectively adjusted and installed on the shaft rod at the axial ends of the expansion core body, and the first locking nut and the second locking nut are used to adjust the axial position of the expansion core body.

[0007] Moreover, a unloading block is slidably connected on the shaft rod between the second locking nut and the expanding core body, and the unloading block includes a pressure block and a push rod. The pressure block is an arc-shaped block structure that fits the second locking nut. One end of the pressure block abuts the second locking nut, and the middle part of the other end of the pressure block is fixedly connected to the push rod. The other end of the push rod abuts the expanding core body, and the push rod is inserted between the expansion sleeve and the shaft rod.

[0008] Moreover, the expanding core body includes an extrusion block, a sleeve and a connecting rod. The sleeve is a cylindrical structure and is coaxially slidably mounted on the shaft rod. An annular extrusion block is fixedly provided in the middle of the outer periphery of the sleeve, and the outer periphery of the extrusion block is provided with a guiding inclined surface of a conical structure; an axial channel is provided on one radial side of the extrusion block, and a connecting rod is passed through the channel, and the extrusion block and the connecting rod can slide relative to each other; the connecting rod is fixedly connected to the shaft rod.

[0009] Moreover, a protrusion is arranged on one radial side of the inner circumference of the sleeve, and an axial limiting groove is arranged on one radial side of the middle part of the shaft rod; the cooperation between the protrusion and the limiting groove can prevent the sleeve and the shaft rod from rotating relative to each other.

[0010] Moreover, a bolt hole is provided at the end of the connecting rod for connecting the shaft rod; a plurality of positioning holes are arranged at intervals on the connecting rod, and the positioning holes are used to install short screws to fix and connect the expansion sleeve; and the extrusion block can move between adjacent short screws.

[0011] Moreover, the main body of the expansion sleeve is a cylindrical structure, one axial side of the expansion sleeve is a fixed ring, and the other axial side of the expansion sleeve is annularly distributed with multiple strip slits, and the strip slits divide the expansion sleeve main body into expansion pieces.

[0012] Moreover, a round hole is arranged at the end of the strip-shaped slit close to the fixing ring.

[0013] Moreover, through holes are symmetrically arranged on both radial sides of the fixing ring, short screws are installed in the through holes, and the expansion sleeve is fixedly connected to the connecting rod through the short screws.

[0014] Moreover, ball bearings are installed at both axial ends of the shaft rod, and an external cylindrical gear is installed on the outer side of the ball bearing at one end through a key. The shaft rod is installed in the coating machine through the bearing, and driving the external cylindrical gear can make the shaft rod rotate.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. Mechanical expansion shafts are suitable for a variety of scenarios. They have obvious advantages in environments without air sources and have better stability in environments with large changes in temperature and humidity. They are of great significance for expanding the applicable scenarios of expansion shafts and promoting the development of the expansion shaft industry.

[0017] 2. The mechanical expansion shaft adopts a mechanical structure, and the parts have higher precision during production and manufacturing, and can be fine-tuned, which has great application value in precision instruments.

[0018] 3. Mechanical expansion shafts use mechanical structures to transmit torque. Compared with ordinary pneumatic expansion shafts, they have higher precision and stronger load capacity. They are suitable for equipment with long working length, large load, and high-speed operation. It is of great practical significance to promote the application of expansion shafts in large and heavy equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of this application.

[0020] Figure 2 It is a schematic diagram of the split structure (exploded diagram).

[0021] Figure 3 It is a schematic diagram of the overall appearance of this structure.

[0022] Figure 4 yes Figure 3 AA section view.

[0023] Figure 5 yes Figure 4 An enlarged schematic diagram of part B in FIG.

[0024] Figure numbers: 1. shaft rod; 101. limit groove; 102. shaft shoulder; 103. shaft side bolt hole; 2. first locking nut; 3. expansion core; 301. extrusion block; 302. shaft sleeve; 303. connecting rod; 304. positioning hole; 305. protrusion; 306. long screw; 307. short screw; 4. expansion sleeve; 401. expansion sheet; 402. strip slit; 403. through hole; 404. round hole; 5. unloading block; 501. pressure block; 502. push rod; 6. second locking nut; 7. ball bearing; 8. external cylindrical gear. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application clearer and easier to understand, the present application is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0026] See also Figure 1 As shown,

[0027] A mechanical expansion shaft comprises a shaft, an expansion sleeve, an expansion core, a first locking nut and a second locking nut. Ball bearings are respectively installed at both axial ends of the shaft, and an outer cylindrical gear is installed on the outer side of the ball bearing at one end through a key. The shaft is installed in a coating machine through the bearing, and the outer cylindrical gear is driven to rotate the shaft.

[0028] The outer limit sleeve of the middle part of the shaft is equipped with an expansion sleeve, which is a plurality of expansion sleeves arranged continuously in the axial direction. Figure 1In the embodiment shown, 4 expansion sleeves are provided, and the number of expansion sleeves can be adjusted according to the actual applicable size. The expansion sleeve is made of metal material with elastic recovery performance, and the expansion sleeve material of this embodiment is specifically 65Mn spring steel.

[0029] An expansion core body is mounted between the expansion sleeve and the shaft rod, and the expansion core body is slidably connected to the shaft rod. The expansion core body includes an extrusion block, and a guide slope is arranged on the extrusion block; the guide slope corresponds to the expansion sleeve one by one. In order to facilitate the adjustment of the position of the expansion core body, the axial length of the expansion core body is greater than the axial length of the expansion sleeve.

[0030] The first locking nut and the second locking nut are respectively adjusted and installed on the shaft rods at the axial ends of the core expansion body, and the axial position of the core expansion body can be adjusted by rotating and adjusting the first locking nut and the second locking nut;

[0031] In this embodiment, the second locking nut is arranged on the lower side of the guide slope, and the first locking nut is arranged on the higher side of the guide slope. The first locking nut moves in the direction of the expansion sleeve to push the expansion core body and expand the expansion sleeve; the second locking nut moves in the direction of the expansion sleeve to loosen the expansion sleeve and restore it to its original state.

[0032] By moving the axial position of the expansion core from the higher side of the guiding inclined surface to the lower side, the extrusion block can be pressed against the expansion sleeve from the inside, causing the expansion sleeve to expand outward; by moving from the lower side of the guiding inclined surface to the higher side, the extrusion block is separated from the expansion sleeve, and the expansion sleeve is elastically restored under the action of its own material recovery, which is convenient for unloading.

[0033] In order to facilitate the separation of the expanding core body and the expanding sleeve, a discharge block is slidably connected to the shaft between the second locking nut and the expanding core body, and the discharge block can transmit the pressure of the second locking nut to the expanding core body.

[0034] See also Figure 2 As shown, the unloading block includes a pressing block and a push rod. The pressing block is an arc-shaped block structure that fits the second locking nut. One end of the pressing block abuts the second locking nut, and the middle of the other end of the pressing block is fixedly connected to the push rod. The other end of the push rod abuts the expansion core body, and the push rod is inserted between the expansion sleeve and the shaft rod.

[0035] See attached Figure 2 As shown, the core expansion body includes an extrusion block, a sleeve and a connecting rod.

[0036] The shaft sleeve is a cylindrical structure, and the shaft sleeve is coaxially sleeved on the shaft rod. A convex block is arranged on one radial side of the inner circumference of the sleeve, and the convex block cooperates with the limiting groove of the shaft rod to prevent the sleeve from rotating;

[0037] An annular extrusion block is fixedly arranged in the middle of the outer circumference of the sleeve, and the outer circumference of the extrusion block is arranged as a guiding inclined surface of a conical structure;

[0038] An axial channel is provided on one radial side of the extrusion block, a connecting rod is passed through the channel, and the extrusion block and the connecting rod can slide relative to each other;

[0039] The end of the connecting rod is provided with a bolt hole for connecting the shaft rod; a plurality of positioning holes are arranged at intervals on the connecting rod, and the positioning holes are used to install short screws to fix and connect the expansion sleeve; the extrusion block can move between adjacent short screws.

[0040] See attached Figure 2 As shown, an annular shoulder matching the size of the core expansion body is arranged at intervals in the middle of the shaft rod, an axial limit groove is arranged on the radial side of the shoulder, and external threads are arranged on the shaft rod at the axial ends of the shoulder, respectively, and the external threads are used to engage the first locking nut and the second locking nut respectively.

[0041] A shaft side bolt hole is arranged on one radial side of the shaft shoulder position, and the shaft side bolt hole is used for limiting the expansion core body.

[0042] See attached Figure 2 As shown, the main body of the expansion sleeve is a cylindrical structure, one axial side of the expansion sleeve is a fixed ring, and the other axial side of the expansion sleeve is evenly distributed with multiple strip seams at annular intervals. The strip seams divide the main body of the expansion sleeve into expansion pieces; through holes are symmetrically arranged on both radial sides of the fixed ring, and short screws are installed in the through holes to fix the axial position of the expansion sleeve on the shaft.

[0043] See attached Figure 3 As shown, a round hole is provided at the end of the strip-shaped seam close to the fixing ring, and the round hole can protect the expansion structure and prevent the fixing ring from being torn along the strip-shaped seam.

[0044] In this embodiment, the length of the strip slit is three quarters of the axial length of the expansion sleeve.

[0045] See also Figure 4 , 5 As shown, the axial end of the connecting rod is fixed to the axial side bolt hole on the shaft rod by a long screw. A plurality of positioning holes are arranged in the middle of the connecting rod, each of which is installed with a short screw. The connecting rod is fixedly connected to the expansion sleeve by the short screw, so that the axial position of the expansion sleeve and the shaft rod is relatively fixed.

[0046] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A mechanical expansion shaft, characterized in that: It includes a shaft rod, an expansion sleeve, an expansion core body, a first locking nut and a second locking nut. The expansion sleeve is provided on the outer peripheral limit sleeve in the middle part of the shaft rod, and the expansion sleeve is a plurality of expansion sleeves arranged continuously in the axial direction; the expansion core body is provided between the expansion sleeve and the shaft rod, and the expansion core body includes an extrusion block, and a guide inclined surface is provided on the extrusion block; the guide inclined surface corresponds to the expansion sleeve one by one; the expansion core body is slidably connected to the shaft rod, and the first locking nut and the second locking nut are respectively adjusted and installed on the shaft rod at the axial ends of the expansion core body, and the first locking nut and the second locking nut are used to adjust the axial position of the expansion core body.

2. The mechanical expansion shaft according to claim 1, characterized in that: A unloading block is slidably connected on the shaft rod between the second locking nut and the expanding core body. The unloading block includes a pressure block and a push rod. The pressure block is an arc-shaped block structure that fits the second locking nut. One end of the pressure block abuts the second locking nut, and the middle of the other end of the pressure block is fixedly connected to the push rod. The other end of the push rod abuts the expanding core body, and the push rod is inserted between the expansion sleeve and the shaft rod.

3. The mechanical expansion shaft according to claim 1, characterized in that: The core expansion body includes an extrusion block, a sleeve and a connecting rod. The sleeve is a cylindrical structure and is coaxially slidably mounted on the shaft rod. An annular extrusion block is fixedly arranged in the middle of the outer circumference of the sleeve, and the outer circumference of the extrusion block is arranged as a guiding inclined surface of a conical structure; an axial channel is arranged on one radial side of the extrusion block, and a connecting rod is passed through the channel, and the extrusion block and the connecting rod can slide relative to each other; the connecting rod is fixedly connected to the shaft rod.

4. The mechanical expansion shaft according to claim 3, characterized in that: A protrusion is arranged on one radial side of the inner circumference of the shaft sleeve, and an axial limiting groove is arranged on one radial side of the middle part of the shaft rod; the cooperation between the protrusion and the limiting groove can prevent the shaft sleeve and the shaft rod from rotating relative to each other.

5. The mechanical expansion shaft according to claim 3, characterized in that: The end of the connecting rod is provided with a bolt hole for connecting the shaft rod; a plurality of positioning holes are arranged at intervals on the connecting rod, and the positioning holes are used to install short screws to fix and connect the expansion sleeve; the extrusion block can move between adjacent short screws.

6. The mechanical expansion shaft according to claim 1, characterized in that: The main body of the expansion sleeve is a cylindrical structure, one axial side of the expansion sleeve is a fixed ring, and the other axial side of the expansion sleeve is annularly distributed with multiple strip slits, and the strip slits divide the expansion sleeve main body into expansion pieces.

7. The mechanical expansion shaft according to claim 6, characterized in that: A round hole is arranged at the end of the strip-shaped slit close to the fixing ring.

8. The mechanical expansion shaft according to claim 6, characterized in that: Through holes are symmetrically arranged on both radial sides of the fixing ring, short screws are installed in the through holes, and the expansion sleeve is fixedly connected to the connecting rod through the short screws.

9. The mechanical expansion shaft according to claim 1, characterized in that: The shaft rod is respectively provided with ball bearings at both axial ends, and an outer cylindrical gear is installed on the outer side of the ball bearing at one end through a key. The shaft rod is installed in the coating machine through the bearing, and the outer cylindrical gear can be driven to rotate the shaft rod.

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