Hand expansion shaft
Through the design of manual screw and threaded structure, the problems of short service life and low accuracy of traditional pneumatic expansion shafts are solved, and manual manual expansion shafts without inflation, long service life and high accuracy are achieved, which are suitable for a variety of scenarios.
Patent Information
- Application Number
- CN202421030773.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The traditional pneumatic inflation shaft has a short service life and requires additional inflatable equipment. It is prone to air leakage and damage or airbag offset, resulting in inaccurate fixation.
A manual hand expansion shaft is designed, adopting screw and threaded structure, which expands or relaxes the key strips through the relative movement of the nut to achieve the fixation of the tile. Multiple key strips and tile structures are used to increase the contact area and Friction and precise swelling and relaxation are achieved through adjusting the handwheel.
It achieves use without inflation, has a long life, high accuracy, flexibility and convenience, and is suitable for different scenarios, without worrying about the airbag deviating from the center of the circle.
Smart Images
Figure CN222181441U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of expansion shafts, in particular to a hand expansion shaft. Background Art
[0002] An expansion shaft is a special rotatable fixed shaft for winding, mainly used in the textile industry, printing industry, etc. Traditional expansion shafts are generally pneumatic expansion shafts, which inflate the airbag inside the expansion shaft so that the airbag pushes the key bar out of the shaft body to fix the object. However, common pneumatic shafts are limited by the number of times the airbag can expand, resulting in a short service life. Additional inflation equipment is required when using them, and the airbag is prone to leakage and damage, and the airbag is offset, resulting in eccentricity with the key bar.
[0003] Therefore, it is necessary to provide a manual expansion shaft that does not require inflation, has a long service life and high precision. Utility Model Content
[0004] The utility model provides a hand expansion shaft to solve the problems raised in the above background technology.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A hand expansion shaft comprises a screw, a front retaining ring and a rear retaining ring are respectively arranged at both ends of the screw, a first thread and a second thread are arranged on the screw, the rotation direction of the first thread is arranged opposite to the rotation direction of the second thread, a nut is threadedly connected to the first thread, and a nut is threadedly connected to the second thread, a sleeve is arranged between the front retaining ring and the rear retaining ring, a plurality of tiles are arranged on the outer peripheral side of the sleeve, a key bar is arranged on the side of the tile facing the sleeve, and the key bar passes through the sleeve and contacts with the first nut and the second nut. When the screw rotates, since the first thread and the second thread are arranged in opposite directions, the first nut and the second nut can be relatively close to or away from each other at the same time, and then the two ends of the key bar are contacted to lift or lower at the same time, so as to achieve the effect of expanding or relaxing the tile.
[0007] Preferably, the circumference of the sleeve is provided with four strip-shaped through holes at the same interval, the key strips are arranged in one-to-one correspondence with the through holes, and limit blocks are provided at both ends of the key strip, and the limit blocks are located inside the sleeve. The limit blocks are longer than the two ends of the through hole and are used to prevent the key strip from escaping from the through hole.
[0008] Preferably, two panel screws are provided on the top of each key bar, and the key bar is fixedly connected to the tile through the panel screws. There are four tiles, and a cylindrical structure covering the outer peripheral surface of the sleeve is formed between the tiles. The key bar lifts up the tile to increase the contact area with the object.
[0009] Preferably, the outer surface of the tile is provided with a plurality of anti-slip grooves to increase the friction between the tile and the object.
[0010] Preferably, the opposite sides of the nut 1 and the nut 2 are both provided with inclined surfaces, so that when the inclined surfaces contact the two ends of the key bar, the key bar can gradually expand or relax, and at the same time, it is convenient for the nut 1, the nut 2 to contact with the key bar to prevent it from getting stuck.
[0011] Preferably, the rear baffle is connected to a baffle plate, the end of the screw rod is connected to an adjusting hand wheel through the baffle plate, and the baffle plate is also provided with a rear bearing sleeved with the screw rod. The screw rod is rotated by the adjusting hand wheel to adjust the expansion or relaxation of the key bar and the tile.
[0012] Preferably, the front retaining ring is provided with a front bearing on one side of the sleeve, the end of the screw away from the retaining plate is sleeve-connected with the front bearing, and a shaft head is also provided on the outside of the front retaining ring. The front bearing and the rear bearing are used to improve the smoothness of the screw when rotating, and the shaft head is used to be fixedly installed with an external device.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] The utility model has a simple structure, and the key strip is inflated or relaxed by the relative movement of nut one and nut two. It uses a manually rotated mechanical structure and does not require additional inflation equipment. It is flexible and convenient, suitable for use in different scenarios, and easy to carry outside. Four key strips are arranged around nut one and nut two at the same interval to ensure that the tile and the key strip always take the screw rod as the center of the circle. It has high precision, long service life, and no risk of deviation from the center of the circle. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the internal cross-sectional structure of the utility model;
[0016] Figure 2 It is a schematic diagram of the external structure of the utility model;
[0017] Figure 3 This is a schematic diagram of the screw and nuts structure of the utility model;
[0018] Figure 4 It is a schematic diagram of the overall structure of the utility model;
[0019] 1. Screw; 2. Sleeve; 3. Front retaining ring; 4. Rear retaining ring; 5. Thread one; 6. Thread two; 7. Nut one; 8. Nut two; 9. Key strip; 10. Tile; 11. Panel screw; 12. Front bearing; 13. Rear bearing; 14. Adjusting hand wheel; 15. Shaft head; 16. Retaining plate. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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] Reference Figure 1-4 A hand expansion shaft comprises a screw rod 1, wherein a front retaining ring 3 and a rear retaining ring 4 are respectively arranged at both ends of the screw rod 1, a thread 1 5 and a thread 2 6 are arranged on the screw rod 1, the rotation direction of the thread 1 5 is arranged opposite to the rotation direction of the thread 2 6, a nut 1 7 is threadedly connected to the thread 1 5, and a nut 2 8 is threadedly connected to the thread 2 6, a sleeve 2 is arranged between the front retaining ring 3 and the rear retaining ring 4, a plurality of tiles 10 are arranged on the outer peripheral side of the sleeve 2, a key strip 9 is arranged on the side of the tile 10 facing the sleeve 2, and the key strip 9 passes through the sleeve 2 and contacts with the nut 1 7 and the nut 2 8. When the screw rod 1 rotates, since the thread 1 5 and the thread 2 6 are arranged in opposite directions, the nut 1 7 and the nut 2 8 can be relatively close to or away from each other at the same time, and then the two ends of the key strip 9 are contacted to lift or lower at the same time, so as to achieve the effect of expanding or relaxing the tile 10.
[0022] The circumference of the sleeve 2 is provided with four strip-shaped through holes at the same interval, the key strips 9 are arranged one by one in correspondence with the through holes, and limit blocks are provided at both ends of the key strip 9, and the limit blocks are located inside the sleeve 2. The limit blocks are longer than the two ends of the through holes and are used to prevent the key strip 9 from escaping from the through holes.
[0023] Two panel screws 11 are provided on the top of each key bar 9, and the key bar 9 is fixedly connected to the tile 10 through the panel screws 11. There are four tiles 10, and a cylindrical structure covering the outer circumference of the sleeve 2 is formed between the tiles 10. The key bar 9 lifts up the tile 10 to increase the contact area with the object.
[0024] The outer surface of the tile 10 is provided with a plurality of anti-skid grooves to increase the friction between the tile 10 and the object. The surface of the tile 10 may also be provided with other pads such as a rubber layer to facilitate the use of objects with different inner diameters, which is not limited here.
[0025] The opposite sides of the nut 1 7 and the nut 2 8 are both provided with inclined surfaces. When the inclined surfaces contact the two ends of the key bar 9, the key bar 9 can gradually expand or relax, and at the same time, it is convenient for the contact between the nut 1 7, the nut 2 8 and the key bar 9 to prevent blocking.
[0026] The rear baffle 4 is connected with a baffle 16, and the end of the screw rod 1 is connected with an adjusting hand wheel 14 through the baffle 16. The baffle 16 is also provided with a rear bearing 13 sleeved with the screw rod 1. The screw rod 1 is rotated by adjusting the hand wheel 14 to adjust the expansion or relaxation of the key bar 9 and the tile 10.
[0027] The front retaining ring 3 is provided with a front bearing 12 on one side of the sleeve 2, and the end of the screw 1 away from the retaining plate 16 is sleeve-connected with the front bearing 12, and a shaft head 15 is also provided on the outer side of the front retaining ring 3. The front bearing 12 and the rear bearing 13 are used to improve the smoothness of the screw 1 when rotating, and the shaft head 15 is used to be fixedly installed with an external device.
[0028] When in use, extend the device into the interior of the object to be fixed, manually rotate the adjusting hand wheel 14, the screw 1 rotates with the adjusting hand wheel 14, and then drives the nut 1 7 and the nut 2 8 to move relative to each other, the two ends of the four key strips 9 contact the inclined surfaces of the nut 1 7 and the nut 2 8, and then gradually expand out of the through hole, and the tile 10 on the outer peripheral side of the sleeve 2 contacts and fixes the inside of the object. When not in use, rotate the adjusting hand wheel 14 in the opposite direction to make the nut 1 7 and the nut 2 8 gradually move away from each other, and then gradually retract the key strip 9 into the sleeve 2 to achieve the loosening of the tile 10 and the object.
[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A hand expansion shaft, comprising a screw (1), characterized in that: A front retaining ring (3) and a rear retaining ring (4) are respectively provided at both ends of the screw rod (1); a first thread (5) and a second thread (6) are provided on the screw rod (1); the rotation direction of the first thread (5) is opposite to the rotation direction of the second thread (6); a nut (7) is threadedly connected to the first thread (5); and a nut (8) is threadedly connected to the second thread (6); a sleeve (2) is provided between the front retaining ring (3) and the rear retaining ring (4); a plurality of tiles (10) are provided on the outer peripheral side of the sleeve (2); a key strip (9) is provided on the side of the tile (10) facing the sleeve (2), and the key strip (9) passes through the sleeve (2) and contacts the first nut (7) and the second nut (8).
2. The hand expansion shaft according to claim 1, characterized in that: The circumferential surface of the sleeve (2) is provided with four strip-shaped through holes at the same intervals, the key strips (9) are arranged in one-to-one correspondence with the through holes, and limit blocks are provided at both ends of the key strip (9), and the limit blocks are located inside the sleeve (2).
3. The hand expansion shaft according to claim 2, characterized in that: Two panel screws (11) are provided on the top of each key strip (9), and the key strip (9) is fixedly connected to the tile (10) via the panel screws (11). There are four tiles (10), and a cylindrical structure covering the outer peripheral surface of the sleeve (2) is formed between the tiles (10).
4. The hand expansion shaft according to claim 3, characterized in that: The outer surface of the tile (10) is provided with a plurality of anti-slip grooves.
5. The hand expansion shaft according to claim 1, characterized in that: The opposite sides of the nut 1 (7) and the nut 2 (8) are both provided with inclined surfaces.
6. The hand expansion shaft according to claim 1, characterized in that: The rear baffle (4) is connected to a baffle (16), the end of the screw rod (1) passes through the baffle (16) and is connected to an adjusting hand wheel (14), and the baffle (16) is also provided with a rear bearing (13) sleeved with the screw rod (1).
7. The hand expansion shaft according to claim 6, characterized in that: The front retaining ring (3) is provided with a front bearing (12) on one side inside the sleeve (2); the end of the screw (1) away from the retaining plate (16) is sleeve-connected to the front bearing (12); and a shaft head (15) is also provided on the outside of the front retaining ring (3).