Pneumatic mechanical expansion shaft

Abstract

The utility model discloses a pneumatic mechanical expansion shaft which comprises a limiting shell, a piston is arranged in the limiting shell in a sliding mode, a plurality of T-shaped grooves are formed in one end face of the bottom of the piston, the T-shaped grooves are formed in the piston in an annular array mode, the T-shaped grooves extend to the side wall of the piston in the direction of the other end face of the piston, and right-angle sliding blocks are connected in the T-shaped grooves in a clamped mode. The inclined edge face of the right-angle sliding block extends outwards to be provided with a convex edge, the inclined bottom wall in the T-shaped groove is further provided with a straight-line-shaped groove, the right-angle sliding block is connected into the straight-line-shaped groove of the T-shaped groove in a clamped mode through the convex edge so that the right-angle sliding block can be connected with the piston in a clamped mode, and the right-angle sliding block is connected with the piston in a sliding mode through the T-shaped groove. Therefore, according to the utility model, the expansion key can be reset without using too many springs or a reset shrinkage piece.

Description

Technical Field

[0001] The utility model relates to the technical field related to pneumatic expansion shafts, in particular to a pneumatic mechanical expansion shaft. Background Art

[0002] In the production process of strip products, the produced products need to be rolled up on the mandrel for transportation and processing in the next process. The inflatable shaft is a special auxiliary shaft used to assist the winding and unwinding of strip products. After high-pressure inflation, its surface can protrude to support the mandrel. After deflation, the surface part quickly retracts to facilitate the removal of the mandrel on it. It is widely used in various machines including winding, unwinding and slitting operations of strips.

[0003] Existing pneumatic shafts such as patent number CN202021955260.1, a pneumatic shaft tooling for a winder, including a pneumatic shaft, a panel for fixing the pneumatic shaft and an air supply mechanism, the pneumatic shaft includes an air inlet shaft with a through hole, an expansion sleeve, an expansion key fixed along the radial sliding of the expansion sleeve, an expansion reset mechanism and an end cover blocking the expansion sleeve. The air inlet shaft is fixed to the panel, one end of which is connected to the outlet of the air supply mechanism, and the other end is fixed to the expansion sleeve. The expansion sleeve passes through and abuts against the expansion reset mechanism of the expansion key, and the air source generated by the air supply mechanism is connected to the expansion reset mechanism through the through hole.

[0004] The above-mentioned air expansion shaft is equipped with a reset spring and a reset retracting part to ensure the contraction of the expansion seat, and additional parts are required to ensure that the expanded parts can retract. The added parts will also increase the cost of the air expansion sleeve. At the same time, the reset retracting part and the reset spring are the parts for the expansion seat to retract. If one of them is damaged, it will affect normal use, so the probability of failure will be relatively high. Some air expansion shafts will use more springs to retract the air expansion parts, because under the action of reciprocating stress, this type of air expansion shaft that uses springs for retraction may be more prone to failure. Utility Model Content

[0005] The utility model aims to provide a pneumatic mechanical expansion shaft to overcome the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The pneumatic mechanical expansion shaft comprises a limit housing, a piston is slidably arranged inside the limit housing, a plurality of T-slots are arranged on one end face of the bottom of the piston, the T-slots are arranged on the piston in a circular array, the T-slots extend to the side wall of the piston in the direction of the other end face of the piston, a right-angle sliding block is clamped in the T-slot, a convex edge is extended outwardly on the hypotenuse surface of the right-angle sliding block, a straight groove is further arranged on the inclined bottom wall inside the T-slot, the right-angle sliding block is clamped into the straight groove of the T-slot through the convex edge to realize the clamping connection between the right-angle sliding block and the piston, and the right-angle sliding block is slidably connected to the piston through the T-slot;

[0008] The side wall of the limiting shell is provided with limiting through holes in an annular array, and the limiting shell limits the axial position of the right-angle sliding block and the limiting shell to remain unchanged through the limiting through holes.

[0009] To further illustrate, an outer side wall of the right-angle sliding block is fixedly connected with an expansion key, and the expansion key is accommodated in the limiting through hole to limit the axial position of the right-angle sliding block and the limiting housing to remain unchanged.

[0010] To further explain, a ventilation shaft is fixedly provided on the top of the limit shell, an air duct is provided inside the ventilation shaft, a sealing ring is provided on the side wall ring of the piston near the top end, the sealing ring is fixedly connected to the piston, the outer wall of the sealing ring abuts against the inner wall of the limit shell, the top of the piston and the inner wall of the limit shell are surrounded to form a sealing gap, and the air duct is connected to the sealing gap.

[0011] To further explain, a reset base is fixedly arranged at the bottom of the limit shell, and the top surface of the reset base extends upward to form a top column, and the top column is sleeved with a reset spring, and the two ends of the reset spring respectively abut against the bottom surface of the piston and the upper surface of the reset base.

[0012] To further explain, the outer surface of the limit housing is also covered with a plurality of expansion and anti-slip sheets arranged in a ring array, and the expansion and anti-slip sheets are fixedly connected to the expansion keys.

[0013] To further elaborate, the outer side wall surface of the expansion anti-skid sheet is provided with anti-skid grooves.

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

[0015] The piston of the utility model is provided with an inclined T-shaped groove, which can force the expansion key to slide out and retract radially during the sliding process. Because the position of the expansion key at the limit shell is unchanged, and the expansion key is clamped on the T-shaped groove and can slide relative to the piston, the expansion key can be controlled to slide radially during the sliding process of the piston inside the limit shell. Therefore, the utility model does not need to use too many springs or reset shrinking parts, and can reset the expansion key. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is an exploded view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the piston and right-angle sliding block of the utility model.

[0019] Notes on the attached drawings:

[0020] 1. Piston; 2. Limit housing; 3. Right-angle sliding block; 4. Expansion key; 5. Sealing ring; 6. T-slot; 7. Slot; 8. Convex edge; 9. Expansion anti-slip sheet; 10. Reset spring; 11. Reset base; 12. Top column; 13. Ventilation shaft; 14. Limit through hole. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When the number of an element is referred to as "plurality", it may be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific implementations and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] The present invention is described in detail below in conjunction with the embodiments shown in the accompanying drawings:

[0025] like Figure 1-3As shown, in this embodiment, a pneumatic mechanical expansion shaft is provided, including a limit housing 2, a piston 1 is slidably arranged inside the limit housing 2, a plurality of T-slots 6 are arranged on one end surface of the bottom of the piston 1, and the T-slots 6 are arranged in an annular array on the piston 1, and the T-slots 6 extend to the side wall of the piston 1 toward the other end surface of the piston 1, which can be referred to Figure 3 The T-slot 6 is a T-shaped part that is similar to the cross section of the piston 1, and the T-slot 6 connects the side wall and the bottom wall of the piston 1. A right-angle sliding block 3 is clamped in the T-slot 6, and a convex edge 8 is provided on the hypotenuse of the right-angle sliding block 3 extending outward. A slot 7 is also provided on the inclined bottom wall inside the T-slot 6. The right-angle sliding block 3 is clamped in the slot 7 of the T-slot 6 through the convex edge 8 to realize the clamping of the right-angle sliding block 3 and the piston 1. The right-angle sliding block 3 is slidably connected to the piston 1 through the T-slot 6; specifically, the hypotenuse of the right-angle sliding block 3 abuts against the inclined bottom wall of the T-slot 6.

[0026] The side wall of the limit housing 2 is provided with a ring array of limit holes 14, and the limit housing 2 limits the axial position of the right-angle sliding block 3 and the limit housing 2 to remain unchanged through the limit holes 14. In other words, the right-angle sliding block 3 cannot move axially relative to the limit housing 2, or can only slide axially to a limited extent within the preset length of the limit hole 14. During specific use, the piston 1 will slide up and down in the limit housing 2, and the position between the right-angle sliding block 3 and the limit housing 2 that are clamped with the limit housing 2 remains unchanged, but slides relative to the piston 1; and the sliding of the piston 1 will change the depth of the inclined bottom wall of the T-slot 6, thereby controlling the radial movement of the right-angle sliding block 3 relative to the limit housing 2.

[0027] When the vent shaft 13 is inflated, the piston 1 is controlled to move downward relative to the limit housing 2, compressing the return spring 10 (mentioned below). As the depth of the inclined bottom wall becomes shallower (the straight groove 7 gradually approaches the outer wall of the piston 1), the right-angle sliding block 3 will be pushed outward in the radial direction.

[0028] When the vent shaft 13 releases gas, the return spring 10 (mentioned below) extends out and returns to its original position, controlling the piston 1 to move upward relative to the limit housing 2. As the depth of the inclined bottom wall increases (the straight groove 7 gradually moves away from the outer wall of the piston 1), the right-angle sliding block 3 will be pulled back inward along the radial direction by the straight groove 7.

[0029] No other resetting and retracting parts are used in the above-mentioned actions, so the design is more ingenious, reducing the use of parts, reducing costs, and reducing the failure rate.

[0030] In this embodiment, the outer wall of the right-angle sliding block 3 is fixedly connected with a tensioning key 4, and the tensioning key 4 is accommodated in the limiting through hole 14 to limit the axial position of the right-angle sliding block 3 and the limiting shell 2 to remain unchanged. The size and dimension of the tensioning key 4 are only equal to or slightly smaller than the limiting through hole 14, so the limiting through hole 14 can limit the position of the right-angle sliding block 3 through the tensioning key 4.

[0031] In this embodiment, a ventilation shaft 13 is fixedly provided on the top of the limiting shell 2, an air duct is provided inside the ventilation shaft 13, a sealing ring 5 is provided on the side wall ring of the piston 1 near the top end, the sealing ring 5 is fixedly connected to the piston 1, the outer wall of the sealing ring 5 abuts against the inner wall of the limiting shell 2, the top of the piston 1 and the inner wall of the limiting shell 2 are surrounded to form a sealing gap, the air duct is connected to the sealing gap, and the ventilation shaft 13 is connected to an air pump through one end to control the sliding of the piston 1 in the limiting shell 2.

[0032] In this embodiment, a reset base 11 is fixedly provided at the bottom of the limit housing 2, and the top surface of the reset base 11 extends upward to form a top column 12. The top column 12 is sleeved with a reset spring 10, and the two ends of the reset spring 10 respectively abut against the bottom surface of the piston 1 and the upper surface of the reset base 11. When inflating, the piston 1 moves downward, and the spring is compressed. When the gas is released, the spring is reset and the piston 1 is pushed upward to complete the reset.

[0033] In this embodiment, in order to increase the abutment area and prevent the tensioned parts from falling off, a plurality of expansion and anti-skid sheets 9 arranged in an annular array are also provided on the outer surface of the limit housing 2. The expansion and anti-skid sheets 9 are fixedly connected to the expansion key 4, and the outer wall surface of the expansion and anti-skid sheets 9 is provided with anti-skid grooves. The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. For ordinary technicians in this field, without departing from the concept of the utility model, several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Pneumatic mechanical expansion shaft, characterized by: It comprises a limit housing, a piston is slidably arranged inside the limit housing, a plurality of T-slots are arranged on one end face of the bottom of the piston, the T-slots are arranged on the piston in a ring array, the T-slots extend to the side wall of the piston in the direction of the other end face of the piston, a right-angle sliding block is clamped in the T-slot, a convex edge is extended outwardly on the hypotenuse surface of the right-angle sliding block, a straight groove is further arranged on the inclined bottom wall inside the T-slot, the right-angle sliding block is clamped into the straight groove of the T-slot through the convex edge to realize the clamping connection between the right-angle sliding block and the piston, and the right-angle sliding block is slidably connected with the piston through the T-slot; The side wall of the limiting shell is provided with limiting through holes in an annular array, and the limiting shell limits the axial position of the right-angle sliding block and the limiting shell to remain unchanged through the limiting through holes.

2. The pneumatic mechanical expansion shaft according to claim 1, characterized in that: An expansion key is fixedly connected to the outer side wall of the right-angle sliding block, and the expansion key is accommodated in the limiting through hole to limit the axial position of the right-angle sliding block and the limiting housing to remain unchanged.

3. The pneumatic mechanical expansion shaft according to claim 1, characterized in that: A ventilation shaft is fixedly arranged on the top of the limiting shell, an air duct is arranged inside the ventilation shaft, a sealing ring is arranged on the side wall ring of the piston near the top end, the sealing ring is fixedly connected to the piston, the outer wall of the sealing ring abuts against the inner wall of the limiting shell, the top of the piston and the inner wall of the limiting shell are surrounded to form a sealing gap, and the air duct is connected to the sealing gap.

4. The pneumatic mechanical expansion shaft according to claim 1, characterized in that: A reset base is fixedly arranged at the bottom of the limit shell, and the top surface of the reset base extends upward to form a top column. The top column is sleeved with a reset spring, and the two ends of the reset spring respectively abut against the bottom surface of the piston and the upper surface of the reset base.

5. The pneumatic mechanical expansion shaft according to claim 1, characterized in that: The outer surface of the limiting shell is also covered with a plurality of expansion and anti-skid sheets arranged in a ring array, and the expansion and anti-skid sheets are fixedly connected to the expansion keys.

6. The pneumatic mechanical expansion shaft according to claim 5, characterized in that: The outer side wall surface of the expansion anti-skid sheet is provided with anti-skid grooves.

Images