CN114619272A - Rotatable clamping device and method for thin-wall circular tube - Google Patents

Abstract

The invention discloses a rotatable clamping device and a method for a thin-walled round pipe. The clamping device comprises a clamping mechanism 1, a positioning mechanism 2 and a rotating support mechanism 3; the upper clamp and the lower clamp of the clamping mechanism 1 are both ends Semi-circular arc clamp plate with support lugs, the left end lugs of the upper clamp and the lower clamp are pinned to each other through the pin connection parts, and the right end support lugs of the upper clamp and the lower clamp are mutually positioned and clamped by the clamping parts; The clamp is threadedly connected to the connecting plate; the upper end of the limit screw of the positioning mechanism 2 is provided with a circular hole, and the positioning pin is inserted into the circular hole; the positioning pin is inserted into the inner hole of the guide sleeve, and the middle section of the positioning pin is sleeved with a A spring, the spring bears the inner stepped surface of the guide sleeve; the top of the positioning pin is sleeved with a handle, the guide sleeve is threadedly connected to the connecting plate; the limit screw is threadedly connected to the third upper rotating support mechanism. The invention provides a rotatable clamping device and method for a thin-walled round tube, which is suitable for the clamping and rotation of a round tube and a round rod-like cylinder.

Description

A kind of thin-walled round tube rotatable clamping device and clamping method

technical field

The invention relates to the technical field of assembly of end parts of a round pipe, in particular to a rotatable clamping device and a clamping method for a thin-walled round pipe.

Background technique

Usually, V-blocks are generally used for symmetrical positioning and clamping for round tubes and round rods, which can achieve automatic centering. However, because the clamping place is in line contact, if the clamping force is not properly controlled, a slightly larger amount will cause thin-walled round tubes. Deformation and damage to the workpiece.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes a rotatable clamping device and a clamping method for a thin-walled circular tube, which adopts a semi-circular arc clamping positioning and clamping method, so that the circumference of the workpiece is evenly stressed and not easily deformed when clamping. The designed rotating mechanism can process the workpiece from multiple directions after one clamping, and the positioning mechanism can accurately position the positioning and clamping device. , the end of the round tube can be rotated to the best position for operation. This humanized design makes the operation more convenient and fast, solves the inconvenience of the worker's operation process, avoids the impact on the product quality during the clamping process, and greatly improves the work. At the same time, it can better ensure product quality and save production costs.

In order to achieve the above object, the present invention adopts the following technical solutions:

A rotatable clamping device for a thin-walled round tube, comprising a clamping mechanism 1, a positioning mechanism 2 and a rotating support mechanism 3;

The first clamping mechanism includes an upper clamp, a lower clamp and a connecting plate; the upper clamp and the lower clamp are both semi-circular arc clamps with lugs at both ends, and the upper clamp and the lower clamp are The left end lugs of the upper and lower clamps are pinned to each other through the pinned parts, and the upper clamp can be opened or closed by rotating around the pinned parts; the right end lugs of the upper clamp and the lower clamp are mutually positioned and clamped by the clamping parts; The following clamps are threadedly connected to the connecting plate;

The second positioning mechanism includes a handle, a limit screw, a guide sleeve, a positioning pin, a spring, a lower pin and an upper pin; the upper end of the limit screw is provided with a circular hole, and the positioning pin is inserted into the circular hole; the The guide sleeve is a hollow stepped shaft, the upper shaft section of the guide sleeve is milled with a cross-shaped groove, and the height of the longitudinal groove of the cross-shaped groove is smaller than the height of the horizontal groove; the positioning pin is inserted into the inner hole provided in the guide sleeve, so The middle section of the positioning pin is sleeved with a spring, and the spring bears against the inner stepped surface of the guide sleeve; the upper section of the positioning pin is provided with two radial through holes, and the radial through holes at the lower end are aligned with the transverse groove or the longitudinal groove Connected, a lower pin is pierced through the radial through hole at the lower end, the lower pin is clamped on the bottom end of the horizontal groove or the bottom end of the longitudinal groove, the top of the positioning pin is sleeved with a handle, and the handle is provided with a a small radial hole aligned with the radial through hole at the upper end of the positioning pin, the upper pin is pierced through the small radial hole and the radial through hole at the upper end; the guide sleeve is threadedly connected to the connecting plate;

The limit screw is threadedly connected to the third rotating support mechanism.

Preferably, the pin-connecting component includes a first pin shaft and a split pin; the left end lug of the upper clamp is thinned and inserted into the left end lug groove of the lower clamp, and the left ends of the upper clamp and the lower clamp are The pin holes of the support lugs are aligned, the first pin shaft is inserted into the alignment pin holes, and the first pin shaft is provided with a split pin to limit the position; the left end support ear of the upper clamp or the left end support ear of the lower clamp The edges are square edges.

Preferably, the holding part includes a second pin shaft, a hinge bolt, a ring nut and a split pin; a slot hole is milled in the middle of the right end lug of the upper clamp and the lower clamp, and the hinge bolt is inserted into the device. In the slot holes, the pin holes of the right end lugs of the upper clamp and the lower clamp are aligned with the pin holes of the hinge bolts, the second pin is inserted into the alignment pin hole, and the second pin is on the A split pin is provided to limit the position, the upper section of the hinge bolt is connected with a ring nut through a thread, and the ring nut presses the upper clamp lug so that the upper clamp and the lower clamp are tightly held.

Preferably, two sides of the connecting plate are respectively threadedly connected with a lower clamp; and the two lower clamps are respectively provided with an upper clamp connected with each other.

Preferably, the middle end surface of the guide sleeve is a flange surface, and the guide sleeve and the connecting plate are threadedly connected to each other through the flange surface.

Preferably, the positioning pin is a solid stepped shaft; the head of the lower section of the positioning pin is tapered, the middle section of the large shaft is fitted into the inner hole of the guide sleeve, and the middle and upper section of the small shaft is sleeved with a spring.

Preferably, the rotating support mechanism 3 includes a rotating shaft, an upper bearing cover, a bearing seat, a thrust ball bearing, a deep groove ball bearing, a support frame and a lower bearing cover; the rotating shaft is a hollow stepped shaft, and the rotating shaft and The connecting plate is threadedly connected; the upper bearing cover is an annular plate, the inner hole of the upper bearing cover is a stepped hole, and the end surface of the stepped inner hole of the upper bearing cover is fit with the gap of the large end stepped surface of the rotating shaft; The lower end of the upper bearing cap is screwed with a bearing seat, the bearing seat is a hollow stepped shaft, the inner hole of the bearing seat is a small hole in the middle, the two ends of the inner hole are large holes, and the upper end of the bearing seat is a large hole A thrust ball bearing is installed inside, the big hole at the lower end of the bearing seat is a deep groove ball bearing, the lower end face of the big end step of the rotating shaft bears against the outer ring of the thrust ball bearing, and the upper half of the big end of the bearing seat Milled into a cross shape, the lower end of the cross-shaped convex edge of the bearing seat is threadedly connected with a support frame, the support frame is a square arch bracket, and the upper end of the cross-shaped convex edge of the bearing seat is threadedly connected with a limit screw ; The lower bearing cover is a circular cover-shaped plate, the lower bearing cover is threadedly connected to the lower end of the bearing seat, the upper surface ring of the lower bearing cover bears against the outer ring of the deep groove ball bearing, the lower bearing A cover covers the bearing housing and the rotating shaft.

Preferably, an anti-rotation pin is pierced through the limit screw and the bearing seat.

The solution also provides a clamping method for a rotatable clamping device for a thin-walled round tube, comprising the following steps:

S1: One positioning of the clamping mechanism

First, the radial through hole at the lower end is aligned and communicated with the transverse groove, a lower pin is passed through the radial through hole at the lower end, the lower pin is clamped on the bottom end of the transverse groove, and the positioning pin is inserted into the limit screw hole under the action of elastic force. Once the clamping mechanism is in the positioning state, the whole device is fixed;

S2: Workpiece clamping

Hold the ring nut and unscrew it counterclockwise. The joint bolts rotate together around the second pin shaft and are placed on the side of the lower clamp; then rotate the upper clamp around the first pin to open it; the left ear of the upper clamp is a square edge , the square edge rests on the side of the lower clamp; then put the thin-walled round tube into the two semi-circles of the clamp, close the upper clamp, hold the ring nut to make the joint bolt rotate around the second pin, rotate the ring clockwise The nut presses the upper clamp lug, so that the upper clamp and the lower clamp hold the round tube tightly to achieve rapid positioning and clamping; after the clamping is completed, the workpiece can be processed;

S3: Loose Clamp Pickup

When the processing is finished, hold the ring nut to loosen it counterclockwise, the joint bolt rotates around the second pin shaft together, and is placed on the side of the lower clamp; then rotate the upper clamp around the first pin to open, and remove the workpiece;

S4: Reversing the clamping mechanism

When it is necessary to change the direction of the workpiece, pull the handle outside, compress the spring, overcome the elastic force, and rotate the positioning pin to the required position together. The radial through hole at the lower end is drilled with a lower pin, and the lower pin is clamped at the bottom end of the longitudinal groove. At this time, the positioning pin is pulled out from the limit screw hole against the elastic force, and the positioning mechanism 2 is in a free rotation state; when the rotating clamping mechanism 1 reaches a suitable position, pull the handle outside and rotate together with the positioning pin. A lower pin is pierced into the through hole, the lower pin is clamped on the bottom end of the horizontal groove, and the positioning pin is inserted into the limit screw hole under the action of elastic force.

Compared with the prior art, the beneficial effects of the present invention are:

(1) According to the structural characteristics of the thin-walled round tube, the semi-circular arc holding method is adopted to make the circumference of the workpiece evenly clamped and not easily deformed, so as to avoid damage to the product during the clamping process; this device is suitable for round tubes and round rods. Clamping and rotation of the body. It is especially suitable for the assembly of the end parts of thin-walled round pipes with larger diameters and longer dimensions;

(2) The design of the rotating mechanism can rotate the thin-walled round tube to a position that is convenient for operation according to the needs. The humanized design makes the operation more convenient and fast, and greatly improves the work efficiency;

(3) There is a positioning mechanism between the clamping mechanism and the rotating mechanism, so that the position of the clamping mechanism is controllable;

(4) The inner hole of the upper bearing cover is designed as a stepped hole, and the end face of the stepped inner hole is fitted with a small gap between the stepped surface of the rotating shaft, which is better than a straight hole to prevent dust from entering the bearing;

(5) Choose two pairs of thrust ball bearings and deep groove ball bearings with different structures, so that the whole device can not only bear the axial force, but also play the role of radial support;

(6) The whole device has a novel concept, safe clamping and reliable positioning, which avoids damage to the workpiece during loading and unloading, and ensures product quality. Fast loading and unloading, convenient operation, greatly improve the production efficiency.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is a front view of the clamping mechanism of the present invention;

Fig. 3 is a clamping diagram of a clamping mechanism of the present invention;

Fig. 4 is the clamping mechanism of the present invention - a loose clamping diagram;

Fig. 5 is a top view of the clamping mechanism of the present invention;

6 is a two-positioning state diagram of the positioning mechanism of the present invention;

FIG. 7 is a second rotation state diagram of the positioning mechanism of the present invention;

8 is a three-A-A view of the rotary support mechanism of the present invention;

Fig. 9 is the three top plan view of the rotating support mechanism of the present invention;

Figure 10 is a B-B view of the bearing seat of the present invention;

Figure 11 is a top view of the bearing seat of the present invention;

Figure 12 is a C-C view of the support frame of the present invention;

FIG. 13 is a top view of the support frame of the present invention.

In the figure: 1. Upper clamp; 2. Ring nut; 3. Swivel bolt; 41. First pin; 42. Second pin; 5. Split pin; 6. Lower clamp; 7. First screw 8, the first elastic washer 11; 9, the connecting plate; 10, the first bolt; 11, the first elastic washer; 12, the handle; 131, the lower pin; 132, the upper pin; 14, the spring; 15, the second screw ;16, guide bush; 17, locating pin; 18, limit screw; 19, anti-rotation pin; 20, rotating shaft; 21, upper bearing cap; 22, third screw; 23, thrust ball bearing; 24, second Bolt; 25, second elastic washer; 26, bearing seat; 27, support frame; 28, deep groove ball bearing; 29, lower bearing cover; 30, longitudinal groove; 31, transverse groove.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

In the description of the present invention, unless otherwise stated, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by , "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, not An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. Ground connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example:

As shown in Figure 1-13, a thin-walled round tube rotatable clamping device is mainly composed of three parts: a clamping mechanism, a positioning mechanism, and a rotating support mechanism. The entire unit can be mounted on a workbench or assembly line with 4 T-bolts. The first clamping mechanism is mounted on the rotating shaft 20 through four first bolts 10 and the first elastic washer 11 . The second positioning mechanism is mounted on the connecting plate 9 through three second screws 15 .

Referring to Figure 2, Figure 3, Figure 4 and Figure 5, the first clamping mechanism includes an upper clamp 1 (2), a ring nut 2 (2), a joint bolt 3 (2), a first One pin 41 (2); the second pin 42 (2), the split pin 5 (4), the lower clamp 6 (2), the first screw 7 (4), the first elastic washer 11 (4 pieces), connecting plate 9, first bolts 10 (4 pieces), and first elastic washers 11 (4 pieces).

As shown in FIG. 3 , the upper clamp 1 and the lower clamp 6 are both semicircular arc clamps with lugs at both ends. The left end support lug of the upper clamp 1 is milled and inserted into the left end support ear groove of the lower clamp 6. After the pin holes of the upper clamp 1 and the lower clamp 6 are aligned, the first pin shaft 41 is passed through the pin hole with a split pin. 5. The upper clamp 1 can be opened or closed by rotating around the first pin shaft 41. The upper clamp 1 and the lower clamp 6 are milled with grooves in the middle lugs of the right ends, the hinge bolts 3 are inserted into the grooves, and the pin holes of the right end lugs of the upper clamp 1 and the lower clamp 6 are aligned with the pin holes of the hinge bolts Use the second pin shaft 42 to string up the alignment holes and then use the split pin 5 to limit the position, and the joint bolt 3 can rotate around the second pin shaft 42 . The upper section of the joint bolt 3 is connected with a ring nut 2 through a thread.

After the upper clamp 1 and the lower clamp 6 are closed, there is a gap between the upper and lower clamp ears, so that the upper clamp 1 goes down until it is tightly held. Hold the ring nut 2 to make the joint bolt 3 rotate around the second pin shaft 42, and rotate the ring nut 2 to press the upper clamp 1 ear, so that the upper clamp 1 and the lower clamp 6 hug the round tube to achieve rapid positioning Clamp (see Figure 3). When loosening the clamp, hold the ring nut 2 to loosen it counterclockwise, rotate it around the second pin shaft 42 together with the joint bolt 3, and place it at the side B of the lower clamp 6. Then, the upper clamp 1 is rotated around the first pin shaft 41 to open. Because the left end lug of the upper clamp 1 is designed to be square, the square edge A is against the side of the lower clamp 6, and stays at the position shown in Figure 4 when opened, so that it will not touch the workbench, and it is very convenient and fast to handle.

The connecting plate 9 is a square plate with two countersunk holes on both ends of the bottom surface. The lower clamp 6 is fastened by the first screw 7 and the first elastic washer 11, and two lower clamps are respectively connected on both sides of the connecting plate 9. 6. Four circular through holes are evenly distributed with the center of the connecting plate 9 as the center of the circle, and are connected to the rotating shaft 20 through the first bolt 10 and the first elastic washer 11 . There is a round hole next to the connecting plate 9, and three threaded holes are evenly distributed around the round hole, and the second positioning mechanism is installed here.

Referring to FIG. 6 and FIG. 7 , the second positioning mechanism is shown, and FIG. 6 is the positioning mechanism 2 in the positioning state, and FIG. 7 is the positioning mechanism 2 in the rotating state. The second positioning mechanism is mainly composed of a handle 12 , a lower pin 131 , an upper pin 132 , a spring 14 , a second screw 15 , a guide sleeve 16 , a positioning pin 17 , a limit screw 18 and an anti-rotation pin 19 . The limit screw 18 is screwed on the bearing seat 26 and is equipped with an anti-rotation pin 19 to limit the rotation and prevent loosening. The upper part of the limit screw 18 has a round hole, and the positioning pin 17 is inserted into it during positioning. The guide sleeve 16 is a hollow stepped shaft, the middle part is a flange surface, and three screw counterbores are evenly distributed on the flange surface. The upper shaft section is milled with a cross-shaped groove. The height of the longitudinal groove 30 of the cross-shaped groove is smaller than the height of the transverse groove 31 , and the height difference between the transverse groove 31 and the longitudinal groove 30 is greater than the depth of the positioning pin 17 inserted into the hole of the limit screw 18 .

The upper section of the positioning pin 17 has two radial through holes, which are respectively equipped with a lower pin 131 and an upper pin 132 . When the positioning mechanism 2 is in the positioning state (as shown in FIG. 6 ), the radial through hole at the lower end is aligned and communicated with the transverse groove 31 , a lower pin 131 is passed through the radial through hole at the lower end, and the lower pin 131 is clamped on the bottom end of the transverse groove 31 . , the positioning pin 17 is inserted into the hole of the limit screw 18 . When the positioning mechanism 2 is in the rotating state (as shown in FIG. 7 ), the radial through hole at the lower end is aligned and communicated with the longitudinal slot 30 , a lower pin 131 is pierced through the radial through hole at the lower end, and the lower pin 131 is clamped on the bottom end of the longitudinal slot 30 . , the positioning pin 17 is pulled out from the hole of the limit screw 18 .

The positioning pin 17 is a solid stepped shaft, which can move up and down in the guide sleeve 16 . The lower section of the positioning pin 17 has a tapered head, which is convenient for the shaft to be inserted into the hole. The diameter of the middle section is larger for the mating surface with the guide sleeve 16, and the precision and surface roughness are higher. The middle section of the small shaft is sleeved with a spring 14. Mandrel. The upper section of the positioning pin 17 is provided with two small round holes, which are respectively equipped with a lower pin 131 and an upper pin 132 . The positioning pin 17 is put on the spring 14 and then inserted into the hole of the guide sleeve 16 .

First, the radial through hole at the lower end is aligned and communicated with the transverse groove 31, and a lower pin 131 is pierced through the radial through hole at the lower end. The guide bush 16 falls out. Then, the handle 12 is inserted from the top of the positioning pin 17, and the small end of the handle 12 is provided with a small radial hole, which is aligned with the radial through hole of the upper end of the positioning pin 17 and then the upper pin 132 is driven, so that the handle 12 and the positioning pin 17 are fixed without any relative motion. After the second positioning mechanism is assembled, three screws are drilled through the three screw counterbores on the flange surface of the guide sleeve 16 so that the guide sleeve 16 is installed on the connecting plate 9 .

Referring to FIG. 8 and FIG. 9 , the third rotating support mechanism includes a rotating shaft 20 , an upper bearing cover 21 , a third screw 22 , a thrust ball bearing 23 , a second bolt 24 , a second elastic washer 25 , and a bearing seat 26 , Support frame 27 , deep groove ball bearing 28 and lower bearing cover 29 . The rotating shaft 20 is a hollow stepped shaft, which can reduce weight by being hollow. The machining accuracy of the mounting surface of the outer circumferential bearing of the small end is high. In order to reduce the grinding area, an annular groove is formed in the middle of the outer circle of the rotating shaft 20 . The upper bearing cover 21 is an annular plate, the inner hole is a stepped hole, and the end face of the stepped inner hole at D is fitted with a small gap between the stepped face of the large end of the rotating shaft 20, which can better prevent dust. The outer circumference of the upper bearing cover 21 is evenly distributed with 4 V-shaped countersunk holes, and the upper end face of the bearing seat 26 is evenly distributed with 4 screw holes, which correspond to the 4 V-shaped countersunk holes on the upper bearing cover 21, and the countersunk head third screw 22 Install the upper bearing cover 21 on the bearing seat 26 to prevent dust from entering the thrust ball bearing 23 and the deep groove ball bearing 28 from the upper end.

The bearing seat 26 is a hollow stepped shaft (see Figure 10, Figure 11), the upper half of the big end is milled into a cross shape, a round hole is drilled at the convex edge of the cross shape, and the second bolt 24 and the second elastic washer 25 pass through the round hole. It is threadedly connected with the support frame 27; the other two threaded holes on the cross-shaped convex edge are the installation holes of the limit screw 18. The four threaded holes evenly distributed on the lower end surface of the bearing seat 26 are the mounting holes of the lower bearing cover 29 . The middle hole of the bearing seat 26 is large at both ends and small in the middle, and the large holes at both ends are the mounting holes of the bearing, and the machining accuracy is high. A thrust ball bearing 23 is installed in the large hole at the upper end of the bearing seat 26 , and a deep groove ball bearing 28 is installed in the large hole at the lower end of the bearing seat 26 . The thrust ball bearing 23 bears the weight of the workpiece and other axial forces, and the deep groove ball bearing 28 plays a supporting and guiding role. The lower bearing cover 29 is a circular cover-shaped part. The upper surface has a ring against the outer ring of the bearing to prevent and prevent the movement of the bearing. There are 4 V-shaped countersunk holes evenly distributed on the outer circumference. On the seat 26, dust is prevented from entering the bearing from the lower end and has a limiting effect. The support frame 27 (see Fig. 12 and Fig. 13 ) is a square arch-shaped support, which is formed by welding a rectangular top plate, two side vertical plates and two bottom plates. There is a circular hole in the center of the top plate that is slightly larger than the outer circle of the lower end of the bearing seat 26, so that the bearing seat 26 with two bearings, the rotating shaft 20, etc. is installed conveniently. Four threaded holes are evenly distributed around the central circular hole of the support frame 27 . Four T-bolt slots are symmetrically milled on both sides of the bottom plate of the support frame 27 to facilitate the fixing of the support frame 27 to the workbench.

The present embodiment also provides a method for clamping a thin-walled round tube rotatable clamping device, comprising the following steps:

S1: Position the clamping mechanism first

Referring to FIG. 6 , the radial through hole at the lower end is aligned and communicated with the transverse groove 31 , a lower pin 131 is passed through the radial through hole at the lower end, the lower pin 131 is clamped on the bottom end of the transverse groove 31 , and the positioning pin 17 is under the action of elastic force Insert the limit screw 18 holes, so that the clamping mechanism is in the positioning state, and the whole device is fixed;

S2: Clamp the workpiece

4 and 3 , loosen the ring nut 2 counterclockwise by hand, rotate around the second pin 42 together with the hinge bolt 3, and place it at the side B of the lower clamp 6; then wrap the upper clamp 1 around the first pin The shaft 41 is rotated and opened; because the left end lug of the upper clamp 1 is designed to be square, the square edge A is against the side of the lower clamp 6, and stays at the position shown in Figure 4 when opened. Then put the thin-walled round tube into the semi-circular arc of the two lower clamps 6, close the upper clamp 1, hold the ring nut 2 to make the joint bolt 3 rotate around the second pin 42, and rotate the ring nut 2 clockwise to press the upper The clamp 1 has a lug, so that the upper clamp 1 and the lower clamp 6 can hold the round pipe tightly to achieve rapid positioning and clamping (see Figure 3). After the clamping is completed, the workpiece can be processed;

S3: Loose Clamp Pickup

When the processing is finished, the ring nut 2 is loosened counterclockwise by hand, and it rotates around the second pin shaft 42 together with the joint bolt 3 and is placed at the side B of the lower clamp 6 . Then rotate the upper clamp 1 around the first pin 41 to open it, place it at A, and remove the workpiece;

S4: Reversing the clamping mechanism

When the workpiece needs to be reversed, pull the handle 12 outside, compress the spring 14, overcome the elastic force, rotate together with the positioning pin 17 to the required position (90° in this scheme), and pass the lower radial through hole through the lower end. The pin 131 and the lower pin 131 are clamped on the bottom end of the longitudinal slot 30. At this time, the positioning pin 17 is pulled out from the hole of the limit screw 18 against the elastic force, and the positioning mechanism 2 is in a free rotation state (as shown in Figure 7); When the mechanism reaches a suitable position (the guide sleeve 16, the clamping mechanism 1 and the rotating shaft 20 all rotate synchronously), the handle 12 is pulled outside and rotated 90° together with the positioning pin 17, and the radial through hole at the lower end is drilled through it. There is a lower pin 131, the lower pin 131 is clamped on the bottom end of the horizontal groove 31, and the positioning pin 17 is inserted into the hole of the limit screw 18 under the action of the elastic force. .

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Equivalent replacements or changes to the inventive concept shall all fall within the protection scope of the present invention.

Claims (9)

1. a thin-walled round tube rotatable clamping device, is characterized in that, comprises clamping mechanism one, positioning mechanism two and rotating support mechanism three; The first clamping mechanism includes an upper clamp, a lower clamp and a connecting plate; the upper clamp and the lower clamp are both semi-circular arc clamps with lugs at both ends, and the upper clamp and the lower clamp are The left end lugs of the upper and lower clamps are pinned to each other through the pinned parts, and the upper clamp can be opened or closed by rotating around the pinned parts; the right end lugs of the upper clamp and the lower clamp are mutually positioned and clamped by the clamping parts; The following clamps are threadedly connected to the connecting plate; The second positioning mechanism includes a handle, a limit screw, a guide sleeve, a positioning pin, a spring, a lower pin and an upper pin; the upper end of the limit screw is provided with a circular hole, and the positioning pin is inserted into the circular hole; the The guide sleeve is a hollow stepped shaft, the upper shaft section of the guide sleeve is milled with a cross-shaped groove, and the height of the longitudinal groove of the cross-shaped groove is smaller than the height of the horizontal groove; the positioning pin is inserted into the inner hole provided in the guide sleeve, so The middle section of the positioning pin is sleeved with a spring, and the spring bears against the inner stepped surface of the guide sleeve; the upper section of the positioning pin is provided with two radial through holes, and the radial through holes at the lower end are aligned with the transverse groove or the longitudinal groove Connected, a lower pin is pierced through the radial through hole at the lower end, the lower pin is clamped on the bottom end of the horizontal groove or the bottom end of the longitudinal groove, the top of the positioning pin is sleeved with a handle, and the handle is provided with a a small radial hole aligned with the radial through hole at the upper end of the positioning pin, the upper pin is pierced through the small radial hole and the radial through hole at the upper end; the guide sleeve is threadedly connected to the connecting plate; The limit screw is threadedly connected to the third rotating support mechanism. 2 . The rotatable clamping device for a thin-walled round pipe according to claim 1 , wherein the pin-connecting component comprises a first pin shaft and a split pin; In the left end lug groove of the clamp, the left end lug pin holes of the upper clamp and the lower clamp are aligned, the first pin is inserted into the alignment pin hole, and the first pin is provided with The cotter pin is limited; the edge of the left support lug of the upper clamp or the left support ear of the lower clamp is a square edge. 3. The rotatable clamping device for a thin-walled round pipe according to claim 2, wherein the holding part comprises a second pin, a joint bolt, a ring nut and a split pin; the upper clamp and A slot hole is milled in the middle of the right end lug of the lower clamp, the hinge bolt is inserted into the slot hole, and the pin hole of the right end support lug of the upper clamp and the lower clamp is aligned with the pin hole of the hinge bolt, so The second pin is inserted into the alignment pin hole, the second pin is provided with a split pin to limit the position, the upper section of the joint bolt is threadedly connected with a ring nut, and the ring nut presses the upper clamp The lugs hold the upper and lower clamps tightly. 4 . The rotatable clamping device for thin-walled round pipes according to claim 3 , wherein two sides of the connecting plate are respectively threadedly connected with a lower clamp; the two lower clamps are respectively provided with matching Connected with upper clamp. 5 . The rotatable clamping device for thin-walled round pipes according to claim 1 , wherein the middle end surface of the guide sleeve is a flange surface, and the guide sleeve is threadedly connected to the connecting plate through the flange surface. 6 . 6 . The rotatable clamping device for thin-walled round tubes according to claim 5 , wherein the positioning pin is a solid stepped shaft; the head of the small shaft in the lower section of the positioning pin is tapered, and the large shaft in the middle section is matched with the large shaft in the middle section. 7 . It is inserted into the inner hole of the guide sleeve, and a spring is sleeved on the small shaft of the middle and upper section. 7 . The rotatable clamping device for a thin-walled round tube according to claim 1 , wherein the third rotating support mechanism comprises a rotating shaft, an upper bearing cover, a bearing seat, a thrust ball bearing, a deep groove ball bearing, a support frame and lower bearing cover; the rotating shaft is a hollow stepped shaft, and the rotating shaft is threadedly connected with the connecting plate; the upper bearing cover is a circular ring plate, the inner hole of the upper bearing cover is a stepped hole, the The end face of the stepped inner hole of the upper bearing cover fits with the gap of the large end step surface of the rotating shaft; the lower end of the upper bearing cover is threadedly connected with a bearing seat, the bearing seat is a hollow stepped shaft, and the middle part of the inner hole of the bearing seat It is a small hole, the two ends of the inner hole are large holes, a thrust ball bearing is installed in the large hole at the upper end of the bearing seat, the large hole at the lower end of the bearing seat is a deep groove ball bearing, and the large end of the rotating shaft is under the step. The end face is against the outer ring of the thrust ball bearing, the upper half of the big end of the bearing seat is milled into a cross shape, the lower end of the cross-shaped convex edge of the bearing seat is threadedly connected with a support frame, and the support frame is a square arch The upper end of the cross-shaped convex edge of the bearing seat is threadedly connected with a limit screw; the lower bearing cover is a circular cover-shaped plate, the lower bearing cover is threadedly connected to the lower end of the bearing seat, and the lower bearing The upper surface ring of the cover bears against the outer ring of the deep groove ball bearing, and the lower bearing cover covers the bearing seat and the rotating shaft. 8 . The rotatable clamping device for a thin-walled round tube according to claim 7 , wherein an anti-rotation pin is passed through the limit screw and the bearing seat. 9 . 9. A method for clamping a thin-walled round tube rotatable clamping device as claimed in any one of claims 1-8, characterized in that, comprising the following steps: S1: One positioning of the clamping mechanism First, the radial through hole at the lower end is aligned and communicated with the transverse groove, a lower pin is passed through the radial through hole at the lower end, the lower pin is clamped on the bottom end of the transverse groove, and the positioning pin is inserted into the limit screw hole under the action of elastic force. Once the clamping mechanism is in the positioning state, the whole device is fixed; S2: Workpiece clamping Hold the ring nut and unscrew it counterclockwise. The joint bolts rotate together around the second pin shaft and are placed on the side of the lower clamp; then rotate the upper clamp around the first pin to open it; the left ear of the upper clamp is a square edge , the square edge rests on the side of the lower clamp; then put the thin-walled round tube into the two semi-circles of the clamp, close the upper clamp, hold the ring nut to make the joint bolt rotate around the second pin, rotate the ring clockwise The nut presses the upper clamp lug, so that the upper clamp and the lower clamp hold the round tube tightly to realize rapid positioning and clamping; after the clamping is completed, the workpiece can be processed; S3: Loose Clamp Pickup When the processing is finished, hold the ring nut to loosen it counterclockwise, the joint bolt rotates around the second pin shaft together, and is placed on the side of the lower clamp; then rotate the upper clamp around the first pin to open, and remove the workpiece; S4: Reversing the clamping mechanism When it is necessary to change the direction of the workpiece, pull the handle outside, compress the spring, overcome the elastic force, and rotate the positioning pin to the required position together. The radial through hole at the lower end is drilled with a lower pin, and the lower pin is clamped at the bottom end of the longitudinal groove. At this time, the positioning pin is pulled out from the limit screw hole against the elastic force, and the second positioning mechanism is in a free rotation state; when the first rotating clamping mechanism reaches a suitable position, pull the handle outside and rotate together with the positioning pin. A lower pin is pierced into the through hole, the lower pin is clamped on the bottom end of the horizontal groove, and the positioning pin is inserted into the limit screw hole under the action of elastic force.

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