CN217377243U - Cap screwing device - Google Patents

Abstract

The utility model discloses a screw capping device, which comprises a clamping jaw component, a screw capping shaft sleeve for driving the clamping jaw component to rotate and a driving rod which is arranged in the screw capping shaft sleeve and can move axially, wherein the clamping jaw component comprises at least two clamping jaws, floating rods which are sequentially arranged from inside to outside, a floating sleeve and a clamping jaw sleeve, at least two clamping jaws are arranged around the floating sleeve, the screw capping shaft sleeve is sleeved outside the clamping jaw sleeve and drives the clamping jaw sleeve to rotate, a reset spring for driving the floating sleeve to float is clamped between the inner wall of the clamping jaw sleeve and the floating sleeve, the clamping jaws comprise a connecting section, a guiding section and an arc-shaped clamping section which are sequentially connected from top to bottom, the connecting section is positioned in the clamping jaw sleeve, the upper end of the connecting section is rotationally connected with the floating sleeve, the guiding section is provided with a guiding inclined plane matched with the bottom edge of the inner side face of the clamping jaw sleeve, when the driving floating rod moves downwards, the floating rod presses the clamping jaw downwards to open the clamping jaw, when the return spring drives the floating sleeve and the floating rod to move upwards, the clamping jaw is folded under the driving of the floating sleeve.

Description

Cap screwing device

[ technical field ] A method for producing a semiconductor device

The utility model relates to a production technical field of bottled drink especially relates to a screw capping device.

[ background of the invention ]

The cap screwing device is used for screwing a cap placed on a bottle to form a complete packaging form, and common products packaged by the cap screwing device comprise bottled mineral water, bottled fruit juice, lactobacillus drinks, carbonated beverages and the like. The existing cap screwing device comprises a cap picking device and a driving mechanism for driving the cap picking device to rotate, the cap picking device comprises an annular cap picking head, the cap picking head is sleeved on a bottle cap during working, and then the cap can be screwed up by driving the cap picking device to rotate through the driving mechanism. Because the cap picking head is annular, if the cap picking head and the bottle cap have slight vertical deviation, the cap picking head can be clamped with the bottle cap when the bottle cap is taken, so that the bottle cap is damaged, and the sale phase of a product is influenced; in addition, the existing cap picking head can only pick up a bottle cap with a specific size, so that the universality is poor.

[ Utility model ] content

The utility model aims to solve the technical problem that overcome prior art not enough and provide a screw capping device, not only can snatch not unidimensional bottle lid, damage bottle lid when can also avoiding picking up the bottle lid.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a cap screwing device comprises a clamping jaw assembly, a cap screwing shaft sleeve for driving the clamping jaw assembly to rotate and a driving rod which is arranged in the cap screwing shaft sleeve and can move axially, wherein the clamping jaw assembly comprises at least two clamping jaws, a floating rod, a floating sleeve and a clamping jaw sleeve which are sequentially arranged from inside to outside, the at least two clamping jaws are arranged around the floating sleeve, the cap screwing shaft sleeve is sleeved on the outer side of the clamping jaw sleeve and drives the clamping jaw sleeve to rotate, a reset spring for driving the floating sleeve to float is clamped between the inner wall of the clamping jaw sleeve and the floating sleeve, the clamping jaws comprise a connecting section, a guide section and an arc-shaped clamping section which are sequentially connected from top to bottom, the connecting section is positioned in the clamping jaw sleeve, the upper end of the connecting section is rotationally connected with the floating sleeve, and the guide section is provided with a guide inclined plane matched with the bottom edge of the inner side face of the clamping jaw sleeve, when the driving rod drives the floating rod to move downwards, the floating rod presses the clamping jaw downwards to open the clamping jaw, and when the reset spring drives the floating sleeve and the floating rod to move upwards, the clamping jaw is folded under the driving of the floating sleeve.

Furthermore, the lower terminal surface of floating rod is convex spherical surface downwards, clamping jaw assembly includes threely the clamping jaw, it is three the clamping jaw encloses into holding spherical surface's cavity, the cavity is spherical cavity or big-end-up's toper chamber, spherical surface with the inner wall of cavity offsets.

Furthermore, a supporting rib extending outwards in the radial direction is arranged on the outer peripheral side of the floating sleeve, and the upper end of the connecting section is hung on the supporting rib.

Furthermore, a flexible diaphragm located above the clamping jaw sleeve is installed in the screw cap shaft sleeve, the floating rod penetrates through the flexible diaphragm, and the floating rod is in sealing fit with the flexible diaphragm.

Furthermore, the inner wall of the clamping jaw sleeve is convexly provided with a limiting step, the floating sleeve comprises a floating sleeve body and a limiting ring fixed on the outer side of the floating sleeve body, and the reset spring is clamped between the limiting step and the limiting ring.

Furthermore, a transmission groove is formed in the outer peripheral side of the clamping jaw sleeve, a through hole which is radially communicated is formed in the side wall of the screwing cover shaft sleeve, the pin rod penetrates through the through hole and is inserted into the transmission groove, and a partition plate located between the two clamping jaws is arranged at the bottom end of the clamping jaw sleeve.

Furthermore, the transmission groove comprises a guide groove extending axially, one end of the pin rod is inserted into the guide groove, and a buffer spring is arranged between the clamping jaw sleeve and the screwing cover shaft sleeve.

Furthermore, the transmission groove further comprises a guide groove and an arc-shaped transition groove, the guide groove is parallel to the guide groove and extends upwards to the top surface of the clamping jaw sleeve, and the transition groove is connected with the bottom end of the guide groove and the bottom end of the guide groove.

Furthermore, the screw capping device also comprises an air cylinder and a motor, the motor drives the screw capping shaft sleeve to rotate, the air cylinder comprises a cylinder body and a telescopic rod, and the telescopic rod forms the driving rod.

The utility model has the advantages that:

1. when the bottle cap is grabbed by the cap screwing device, the driving rod drives the floating rod to move downwards, the floating rod presses the clamping jaw downwards, the clamping jaw moves downwards and opens under the guiding action of the guide inclined plane, the clamping section of the clamping jaw is located on the outer side of the bottle cap at the moment, after the driving rod cancels the pressing force on the floating rod, the reset spring drives the floating sleeve to move upwards, the connecting sleeve drives the clamping jaw and the floating rod to move upwards synchronously, the clamping jaw moves upwards and can be folded and clamp the bottle cap, therefore, the bottle cap is picked up, and then the bottle cap can be screwed up by driving the clamping jaw assembly to rotate through the cap screwing shaft sleeve. The bottle cap is picked up by adopting the mode that at least two clamping jaws are opened and then closed, so that the bottle cap can be prevented from being damaged, and the requirement on the alignment precision of the screwing device and the bottle cap in the vertical direction can be lowered; finally, the versatility of the capping device is also increased, since the jaw assembly is able to pick up caps of different sizes.

2. The lower terminal surface of floating rod is convex spherical face downwards, and clamping jaw assembly includes three clamping jaw, and three clamping jaw encloses into the cavity that holds spherical face, and the cavity is spherical cavity or big-end-up's toper chamber, and spherical face offsets with the inner wall of cavity. By the design, the clamping jaw can be ensured to be smoothly opened and smoothly folded, and clamping stagnation is avoided when the clamping jaw is opened or folded.

3. The outer peripheral side of the floating sleeve is provided with a supporting rib which extends outwards in the radial direction, and the upper end of the connecting section is hung on the supporting rib. By the design, the structure is simple, and the assembly is convenient.

4. A flexible membrane positioned above the clamping claw sleeve is installed in the cover screwing shaft sleeve, the floating rod penetrates through the flexible membrane, and the floating rod is in sealing fit with the flexible membrane. By the design, external dust can be isolated through the flexible diaphragm.

5. The inner wall of the clamping jaw sleeve is convexly provided with a limiting step, the floating sleeve comprises a floating sleeve body and a limiting ring fixed on the outer side of the floating sleeve body, and the reset spring is clamped between the limiting step and the limiting ring. By the design, the structure is simple, and the assembly is convenient.

6. The periphery side of the clamping jaw sleeve is provided with a transmission groove, the side wall of the screw cap shaft sleeve is provided with a through hole which is radially communicated, the pin rod penetrates through the through hole and is inserted into the transmission groove, and the bottom end of the clamping jaw sleeve is provided with a partition plate positioned between the two clamping jaws. By the design, the screwing-on shaft sleeve can be driven to rotate through the pin rod, the clamping jaw sleeve is driven to rotate through the partition plate when rotating, and the bottle cap is screwed up by the rotation of the screwing-on shaft sleeve driving clamping jaw assembly.

7. The transmission groove comprises a guide groove extending axially, one end of the pin rod is inserted into the guide groove, and a buffer spring is arranged between the clamping jaw sleeve and the screwing cover shaft sleeve. After the bottle cap is picked up by the cap screwing device, the whole cap screwing device is moved downwards to apply continuous pressing force to the bottle cap, the buffer spring is compressed at the moment, one end of the pin rod is positioned at the bottom end of the guide groove, and then in the cap screwing process, the clamping jaw sleeve is pulled to move downwards along with the rotation of the bottle cap, namely the pin rod moves towards the upper end of the guide groove to avoid interference on the movement of the bottle cap, so that a platform for placing a bottle body is not required to be driven to move upwards in the cap screwing process, the structure of equipment is simplified, and the cost of the equipment is reduced; finally, after the bottle cap is screwed, the whole bottle cap screwing device is moved upwards, the clamping jaw sleeve moves upwards before the clamping jaw clamps the bottle cap, in the process, the clamping jaw sleeve loses the effect of drawing the clamping jaw in, the clamping jaw opens and releases the bottle cap, and therefore the bottle cap is released by the bottle cap screwing device.

8. The transmission groove also comprises a guide groove and an arc transition groove, the guide groove is parallel to the guide groove and extends upwards to the top surface of the clamping jaw sleeve, and the transition groove is connected with the bottom end of the guide groove and the bottom end of the guide groove. When the pin rod is assembled, one end of the pin rod firstly penetrates through the through hole and extends into the screwing cover shaft sleeve, then enters the guide groove and axially slides to the transition groove, and then the screwing cover shaft sleeve is rotated to enable one end of the pin rod to be inserted into the guide groove, so that the assembly is simple and convenient.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention will be further explained with reference to the drawings:

fig. 1 is a schematic perspective view of a screw capping device according to a preferred embodiment of the present invention;

FIG. 2 is a schematic perspective view of a second embodiment of the capping device of the present invention;

figure 3 is a cross-sectional view of the screw capping device in a preferred embodiment of the present invention;

FIG. 4 is an enlarged view of part A of FIG. 3;

FIG. 5 is a schematic structural view of a jaw case according to a preferred embodiment of the present invention;

fig. 6 is a schematic structural diagram of the slip film in the preferred embodiment of the present invention.

Description of the drawings:

100. a jaw assembly; 110. a floating rod; 111. a spherical surface; 120. a floating sleeve; 121. a floating sleeve body; 1211. supporting ribs; 122. a limiting ring; 130. a clamping jaw sleeve; 131. a small cylindrical section; 1311. a limiting step; 132. a large cylindrical section; 1321. a lower limit shaft shoulder; 133. a tapered section; 1331. a partition plate; 134. a transmission groove; 1341. a guide groove; 1342. a transition groove; 1343. a guide groove; 140. a clamping jaw; 141. a connection section; 1411. hanging edges; 142. a guide section; 1421. an upper guide slope; 1422. a lower guide slope; 143. a clamping section; 150. a return spring; 200. screwing the shaft sleeve; 210. perforating; 220. an upper limit shaft shoulder; 230. a limiting groove; 240. an annular boss; 300. a drive rod; 400. a housing; 500. a pin rod; 600. a buffer spring; 700. a slip film; 710. a limiting boss; 800. a flexible membrane.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, those skilled in the art can obtain other embodiments without making creative efforts, which all belong to the protection scope of the present invention.

Referring to fig. 1 to 6, the capping device in this embodiment includes an air cylinder (not shown), a motor (not shown), a clamping jaw assembly 100, a capping shaft sleeve 200, a driving rod 300, and a housing 400, wherein the housing 400 is sleeved outside the capping shaft sleeve 200, a bearing is disposed between the housing 400 and the capping shaft sleeve 200, so that the capping shaft sleeve 200 can rotate relative to the housing 400 under the driving of the motor, the rotation of the capping shaft sleeve 200 can drive the clamping jaw assembly 100 to rotate synchronously, the air cylinder includes a cylinder body and a telescopic rod that moves vertically relative to the cylinder body, the telescopic rod forms the driving rod 300, and the driving rod 300 is disposed in the capping shaft sleeve 200 and can move axially relative to the capping shaft sleeve 200.

The clamping jaw assembly 100 comprises a floating rod 110, a floating sleeve 120, a clamping jaw sleeve 130 and three clamping jaws 140 arranged around the floating sleeve 120, the floating rod 110 and a driving rod 300 are coaxially arranged, the floating sleeve 120 is sleeved outside the floating rod 110, the clamping jaw sleeve 130 is sleeved outside the floating sleeve 120, the upper end of the clamping jaw sleeve 130 extends into the screw cap shaft sleeve 200, the lower end of the clamping jaw sleeve 130 is exposed, the clamping jaw sleeve 130 comprises a small cylindrical section 131, a large cylindrical section 132 and a conical section 133 which is small in upper part and large in lower part which are sequentially connected from top to bottom, the lower end of the floating rod 110 is positioned in the large cylindrical section 132, a limiting step 1311 is convexly arranged on the inner wall of the small cylindrical section 131, the floating sleeve 120 comprises a floating sleeve body 121 and a limiting ring 122, the floating sleeve body 121 penetrates through the small cylindrical section 131, the lower end of the floating sleeve body 121 is positioned in the large cylindrical section 132, the limiting ring 122 is fixed outside the upper end of the floating sleeve body 121 in a screw connection or threaded connection manner, the return spring 150 is pressed between the limit ring 122 and the limit step 1311.

The clamping jaws 140 include a connecting section 141, a guiding section 142 and an arc-shaped clamping section 143 which are sequentially connected from top to bottom, the connecting section 141 is located in the clamping jaw sleeve 130, an inward extending hanging edge 1411 is arranged at the upper end of the connecting section 141, a radially outward extending supporting rib 1211 is arranged at the lower end of the outer periphery side of the floating sleeve body 121, and the hanging edge 1411 is hung on the supporting rib 1211, so that the upper end of the connecting section 141 is rotatably connected with the floating sleeve 120, the lower end face of the floating rod 110 is a spherical surface 111 which protrudes downwards, when the clamping jaws 140 are in a folded state, the inner side faces of the connecting sections 141 of the three clamping jaws 140 enclose a concave cavity which accommodates the spherical surface 111, the concave cavity is a spherical cavity or a conical cavity with a large top and a small bottom, and the concave cavity is preferably a conical cavity for facilitating the processing and forming of the connecting section 141. The spherical surface 111 abuts against the inner wall of the cavity. The outer side of the guide section 142 is provided with a guide inclined plane, the guide inclined plane comprises an upper guide inclined plane 1421 and a lower guide inclined plane 1422, the upper guide inclined plane 1421 and the lower guide inclined plane 1422 both gradually expand from top to bottom, wherein an included angle between the upper guide inclined plane 1421 and the axis of the floating sleeve 120 is smaller than an included angle between the lower guide inclined plane 1422 and the axis of the floating sleeve 120, before a bottle cap picking action is performed, the upper guide inclined plane 1421 is located in the clamping jaw sleeve 130, the lower guide inclined plane 1422 abuts against the bottom edge of the inner side surface of the tapered section 133, the clamping section 143 is located outside the clamping jaw sleeve 130, the arc lengths and the central angles of the three clamping sections 143 are equal, the bottom surface of the tapered section 133 is further provided with a partition 1331 which horizontally extends radially inwards, the partition 1331 is located between the two clamping sections 143, and the inner end surface of the partition 1331 is located outside the inner side surface of the clamping section 143.

In order to realize the synchronous rotation of the driving jaw assembly 100 of the screw-capping shaft sleeve 200, two through holes 210 which are symmetrically arranged and radially penetrate are arranged on the side wall of the screw-capping shaft sleeve 200 in the present embodiment, two transmission grooves 134 which are symmetrically arranged are arranged on the outer peripheral side of the small cylindrical section 131, each transmission groove 134 comprises a guide groove 1341, a transition groove 1342 and a guide groove 1343, wherein the guide grooves 1341 and the guide grooves 1343 are circumferentially arranged at intervals, and both are strip-shaped grooves which axially extend along the jaw sleeve 130, the transition groove 1342 is an arc-shaped groove which circumferentially extends along the jaw sleeve 130, the transition groove 1342 connects the bottom ends of the guide grooves 1341 and the guide grooves 1343, the upper end of the guide groove 1341 extends upwards to the top surface of the jaw sleeve 130, and the top end of the guide groove 1343 is closed, when the pin rod 500 is assembled, one end of the pin rod 500 firstly passes through the through hole 210 to extend into the screw-capping shaft sleeve 200, then enters the guide groove 1341 and axially slides downwards to the transition groove 1342, then, the jaw sleeve 130 is rotated to insert one end of the pin rod 500 into the guide slot 1343, so that the assembly is simple and convenient. Further, an upper limit shoulder 220 is provided on the outer peripheral side of the screw-cap bush 200, a lower limit shoulder 1321 is provided on the outer peripheral side of the large cylindrical section 132, and a buffer spring 600 is provided between the lower limit shoulder 1321 and the upper limit shoulder 220.

When the cap screwing device in the embodiment is used, the driving rod 300 moves downwards and presses the floating rod 110 downwards, the floating rod 110 presses the clamping jaws 140 downwards to enable the clamping jaws 140 to drive the floating sleeve 120 to move downwards, in the downward moving process of the clamping jaws 140, the bottom edge of the inner side surface of the conical section 133 is sequentially matched with the lower guide inclined surface 1422 and the upper guide inclined surface 1421 to enable the clamping jaws 140 to be opened, the floating sleeve 120 moves downwards to compress the return spring 150, the three clamping jaws 140 are sleeved on the outer side of the bottle cap after being opened, after the driving rod 300 is reset, the pressing force on the floating rod 110 is lost, at the moment, the return spring 150 drives the floating sleeve 120 to move upwards to reset, in the upward moving and resetting process of the floating sleeve 120, the floating sleeve 120 drives the clamping jaws 140 to move upwards to reset and clamp the bottle cap, the bottle cap is lifted upwards for a distance, and when the clamping jaws 140 reset, the floating rod 110 is driven to reset. Therefore, in the embodiment, the bottle cap is picked up by the three clamping jaws 140 in a manner of opening and then closing, so that the bottle cap is prevented from being damaged, and the requirement on the alignment precision of the cap screwing device and the bottle cap in the vertical direction can be lowered; finally, the versatility of the capping device is also increased, since the jaw assembly 100 is able to pick up caps of different sizes.

It should be noted that, during the whole process of picking up the bottle cap, the jaw case 130 moves down to make the upper end of the guide slot 1343 abut against one end of the pin rod 500 under the action of gravity. Subsequently, the whole capping device is moved downwards to cover the bottle cap on the bottle body and apply continuous pressing force to the bottle cap, at this time, the jaw sleeve 130 moves upwards and compresses the buffer spring 600, one end of the pin rod 500 is located at the bottom end of the guide groove 1343, then the motor drives the capping shaft sleeve 200 to rotate, the capping shaft sleeve 200 drives the jaw sleeve 130 to synchronously rotate through the pin rod 500, the rotation direction of the jaw sleeve 130 is the same as the direction in which the transition groove 1342 is rotated into the guide groove 1343 when the pin rod 500 is assembled, and thus the pin rod 500 can be prevented from being separated from the guide groove 1343. The rotation of the jaw sleeve 130 drives the three jaws 140 to rotate through the partition 1331, thereby achieving the tightening of the bottle cap.

In the process of screwing the cap, as the cap rotates and moves downwards, the clamping jaw sleeve 130 is pulled to move downwards, that is, the pin rod 500 moves towards the upper end of the guide groove 1343, so as to avoid interference on the movement of the cap, and therefore, a platform for placing a bottle body does not need to be driven to move upwards in the process of screwing the cap, so that the structure of the equipment is simplified, and the cost of the equipment is reduced; finally, after the cap is screwed, the whole cap screwing device is moved upwards, and the clamping jaws 140 clamp the bottle cap, so that the clamping jaw sleeves 130 move upwards before the clamping jaws 140, in the process, the clamping jaw sleeves 130 lose the effect of closing the clamping jaws 140, and the clamping jaws 140 open and release the bottle cap, thereby completing the release of the bottle cap by the cap screwing device and preparing for next cap screwing.

Because in the process of screwing the cap, the clamping jaw sleeve 130 can vertically move for a plurality of times relative to the screwing cap shaft sleeve 200, so that abrasion exists between the clamping jaw sleeve and the screwing cap shaft sleeve 200, and noise, metal filings and the like can be generated, in order to avoid the above situation, the inside of the screwing cap shaft sleeve 200 in the embodiment is also provided with the sliding film 700, the sliding film 700 is arranged between the screwing cap shaft sleeve 200 and the clamping jaw sleeve 130, the screwing cap shaft sleeve 200 is a metal part, the sliding film 700 is a plastic part, the sliding film 700 is a split ring, the peripheral side of the sliding film 700 is provided with the limit boss 710, the inner side wall of the screwing cap shaft sleeve 200 is provided with the limit groove 230, the limit boss 710 is inserted into the limit groove 230 to axially limit the sliding film 700, the pin rod 500 penetrates through the opening of the split ring to be arranged, so that the synchronous rotation of the sliding film 700 and the screwing cap shaft sleeve 200 can be realized, meanwhile, the sliding film 700 is in contact with the clamping jaw sleeve 130, so that the abrasion of the screwing cap shaft sleeve 200 can be avoided, and the design, and facilitates the later independent replacement of the slip film 700.

Finally, in order to prevent dust from entering the jaw sleeve 130, in the present embodiment, an annular boss 240 extending radially inward is provided in the screw cap shaft sleeve 200, the annular boss 240 is located above the jaw sleeve 130 and the floating sleeve 120, a flexible diaphragm 800 is fixed on the annular boss 240, the floating rod 110 penetrates through the flexible diaphragm 800, and the floating rod 110 is in sealing fit with the flexible diaphragm 800, so that external dust can be isolated by the flexible diaphragm 800.

It is understood that in other embodiments of the present invention, the floating sleeve body and the spacing ring are integrally formed.

It will be appreciated that in other embodiments of the invention, the lower end surface of the float rod may also be planar in the case where the cavity is a conical cavity.

It is understood that, in other embodiments of the present invention, the included angle between the upper guiding inclined plane and the floating sleeve axis may be equal to the included angle between the lower guiding inclined plane and the floating sleeve axis.

It can be understood that in other embodiments of the utility model, in order to realize that the linkage segment is connected with the rotation of the cover that floats, be equipped with the pivot hole in the linkage segment, the circumference interval is equipped with three pairs of mounting panels on the outer wall of the cover that floats, and the pivot runs through the pivot hole and every pair of mounting panel to this realizes that the linkage segment is connected with the rotation of the cover that floats.

It is understood that in other embodiments of the present invention, in order to simplify the structure of the transmission groove, the transmission groove only includes the guide groove, and thus, when the pin rod is assembled, the clamping jaw sleeve needs to be rotated continuously to adjust the position so as to insert one end of the pin rod into the guide groove.

It can be understood that in other embodiments of the utility model, the clamping jaw cover is fixed in the axial direction still can be relatively the screw capping axle sleeve, and the size of driving groove matches with the one end phase-match of pin pole promptly, for the screw in of cooperation bottle lid this moment, still can be through setting up the platform that actuating mechanism drive placed the bottle and along with the screw in distance of bottle lid and rise the same height.

It can be understood that, in other embodiments of the present invention, the limiting boss can also be convexly arranged on the inner wall of the screw capping shaft sleeve, and the limiting groove is arranged on the outer wall of the sliding film; alternatively, to simplify the assembly process, the slip film can also be fixed to the inner wall of the screw-on sleeve by injection molding.

It will be appreciated that in other implementations of the invention, the jaw assembly may also include two jaws or more than three jaws.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (9)

1. A cap screwing device comprises a clamping jaw assembly, a driving rod, a floating sleeve and a clamping jaw sleeve, wherein the clamping jaw assembly comprises at least two clamping jaws, the floating rod, the floating sleeve and the clamping jaw sleeve are sequentially arranged from inside to outside, the at least two clamping jaws surround the floating sleeve, the screw cap shaft sleeve is sleeved on the outer side of the clamping jaw sleeve and drives the clamping jaw sleeve to rotate, a reset spring for driving the floating sleeve to float is clamped between the inner wall of the clamping jaw sleeve and the floating sleeve, the clamping jaws comprise a connecting section, a guide section and an arc-shaped clamping section which are sequentially connected from top to bottom, the connecting section is positioned in the clamping jaw sleeve, the upper end of the connecting section is rotationally connected with the floating sleeve, and the guide section is provided with a guide inclined plane matched with the bottom edge of the inner side face of the clamping jaw sleeve, when the driving rod drives the floating rod to move downwards, the floating rod presses the clamping jaw downwards to open the clamping jaw, and when the reset spring drives the floating sleeve and the floating rod to move upwards, the clamping jaw is folded under the driving of the floating sleeve.

2. The screw capping device according to claim 1, wherein the lower end surface of the floating rod is a spherical surface protruding downwards, the clamping jaw assembly comprises three clamping jaws, the three clamping jaws enclose a concave cavity for accommodating the spherical surface, the concave cavity is a spherical cavity or a conical cavity with a large upper part and a small lower part, and the spherical surface abuts against the inner wall of the concave cavity.

3. The screw capping device as claimed in claim 1, wherein the floating bushing is provided at an outer peripheral side thereof with a radially outwardly extending support rib, and an upper end of the connecting section is hooked on the support rib.

4. The screw capping device of claim 1 wherein a flexible diaphragm is mounted within the screw capping sleeve above the jaw sleeve, the floating rod extends through the flexible diaphragm and is in sealing engagement with the flexible diaphragm.

5. The screw capping device according to claim 1, wherein a limiting step is convexly provided on the inner wall of the jaw sleeve, the floating sleeve comprises a floating sleeve body and a limiting ring fixed on the outer side of the floating sleeve body, and the return spring is clamped between the limiting step and the limiting ring.

6. The screw capping device according to claim 1, wherein the outer peripheral side of the jaw sleeve is provided with a driving groove, the side wall of the screw capping sleeve is provided with a through hole which penetrates radially, a pin rod penetrates through the through hole and is inserted into the driving groove, and the bottom end of the jaw sleeve is provided with a partition plate which is positioned between the two jaws.

7. The screw capping device according to claim 6, wherein the driving groove comprises an axially extending guide groove into which one end of the pin rod is inserted, and a buffer spring is provided between the jaw housing and the screw capping sleeve.

8. The screw capping device of claim 7 wherein the drive slot further comprises a guide slot parallel to the guide slot and extending upwardly to the top surface of the jaw housing, and an arcuate transition slot connecting a bottom end of the guide slot to a bottom end of the guide slot.

9. The screw capping device according to any one of claims 1 to 8, further comprising a cylinder and a motor, the motor driving the capping bushing in rotation, the cylinder comprising a cylinder body and a telescopic rod, the telescopic rod forming the driving rod.

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