Capping device and rotary capping machine

Abstract

The present invention relates to a cap-grabbing device and a rotary capping machine for grasping bottle caps, comprising an upper cover shell, a lower cover shell, a cap-grabbing assembly, and a driving assembly. The upper cover shell is provided with an upper communicating hole extending through its upper and lower surfaces, and the lower cover shell is provided with a lower communicating hole extending through its upper and lower surfaces. The upper cover shell and the lower cover shell are elastically connected in a vertical direction. The cap-grabbing assembly includes three cap-gripping heads, which are evenly arranged around the lower communicating hole, and the first ends of the three cap-gripping heads extend from the lower end of the lower communicating hole to the outside of the lower cover shell. The driving assembly includes two first and second connecting rods capable of relative movement, each of which passes through the upper and lower communicating holes and is connected to the three cap-gripping heads. The first and second connecting rods can drive the three cap-gripping heads to clamp or loosen the bottle cap. This structure is characterized by convenient centering and positioning of the bottle cap and guaranteed quality of the bottle cap.

Description

Technical Field

[0001] The present invention relates to the technical field of capping machines, and in particular to a cap grabbing device and a rotary capping machine comprising the cap grabbing device. Background Art

[0002] Currently, many beverages and condiments on the market are packaged and sold in bottles. This packaging consists of a bottle and a cap, a tinplate three-screw cap. During packaging, the cap must be installed on the bottle and twisted to achieve a threaded connection. Because the tinplate three-screw cap has a smooth surface and is not conducive to applying torque, it requires a high force to grasp and twist the cap, which can easily cause deformation and affect the sealing of the package. Furthermore, when grasping the cap, the grasping device and the cap are misaligned, which can easily prevent the cap from docking with the bottle, affecting packaging efficiency. Summary of the Invention

[0003] The object of the present invention is to provide a cap grabbing device and a rotary capping machine, which are convenient for centering and positioning bottle caps and preventing the bottle caps from being deformed.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A cap-grabbing device is provided for installing bottle caps, comprising: an upper cover shell, a lower cover shell, a cap-grabbing assembly and a driving assembly, the upper cover shell is provided with an upper communicating hole passing through its upper and lower surfaces, the lower cover shell is provided with a lower communicating hole passing through its upper and lower surfaces, the upper cover shell is elastically connected to the lower cover shell in a vertical direction, the cap-grabbing assembly includes three cap-clamping heads, the three cap-clamping heads are evenly arranged in a circle around the lower communicating hole, and the first ends of the three cap-clamping heads extend from the lower end of the lower communicating hole to the outside of the lower cover shell, the driving assembly includes two first connecting rods and a second connecting rod that can move relative to each other, the first connecting rod and the second connecting rod both pass through the upper communicating hole and the lower communicating hole and are connected to the three cap-clamping heads, and the first connecting rod and the second connecting rod can drive the three cap-clamping heads to clamp or loosen the bottle cap.

[0006] Furthermore, a card slot is provided at the second end of the clamping cover head, and an abutment surface is provided between the first end and the second end of the clamping cover head, which is at an angle to the horizontal plane. The first connecting rod is provided with a through hole connecting its two ends, and the second connecting rod is passed through the through hole, and the lower end of the second connecting rod is located outside the through hole. A convex portion is provided at the lower end of the first connecting rod, and the first connecting rod and the clamping cover head are plugged into the convex portion and the card slot, and an abutment portion is provided at the lower end of the second connecting rod that cooperates with the abutment surface, and the second connecting rod and the clamping cover head abut against the abutment surface through the abutment portion.

[0007] Furthermore, the upper end of the second connecting rod is located in the through hole, and a driving rod is provided at the upper end of the first connecting rod, one end of the driving rod is inserted into the through hole, and a first spring is provided between the driving rod and the second connecting rod, and the driving member can compress the first spring and make the second connecting rod abut against the clamping cover head, and the driving rod can selectively abut against the upper end of the first connecting rod, so that the driving rod can drive the first connecting rod and the second connecting rod to move in the vertical direction.

[0008] Furthermore, a first adjusting nut is sleeved on the upper end of the first connecting rod, and a second spring is arranged between an end surface of the lower cover shell close to the upper cover shell and the first adjusting nut. When the first connecting rod moves downward, the first adjusting nut can compress the second spring, and the second spring can drive the first connecting rod to move upward.

[0009] Furthermore, a third spring is provided between the upper cover and the lower cover, and the upper cover and the lower cover can compress the third spring and make opposite ends of the upper cover and the lower cover selectively abut against each other.

[0010] Furthermore, it also includes a connecting cover shell, and the opposite ends of the upper cover shell and the lower cover shell are respectively connected to the connecting cover shell, and the connecting cover shell is provided with an internal thread on the side close to the upper cover shell, and the upper cover shell is provided with an external thread that cooperates with the internal thread, and the connecting cover shell and the upper cover shell are connected and fixed by the internal thread and the external thread, and the connecting cover shell is provided with a guide hole on the side close to the lower cover shell, and the lower cover shell is provided with a guide key that cooperates with the guide hole, and the guide key is plugged into the guide hole and can slide along the length direction of the guide hole, and the connecting cover shell and the lower cover shell are slidably connected through the guide hole and the guide key.

[0011] Furthermore, a cap clamping colloid is provided on a side of the cap clamping head facing the bottle cap, the cap clamping colloid is matched with the bottle cap, and the hardness of the cap clamping colloid is less than the hardness of the bottle cap.

[0012] A rotary capping machine is also provided, comprising the above-mentioned capping device, and further comprising a lifting device and a rotating device, wherein the lifting device is connected to the driving rod of the capping device, and the lifting device can drive the driving rod to move in a vertical direction, and the rotating device is connected to the upper cover shell, and the rotating device can drive the capping device to rotate horizontally around the axis of the capping device.

[0013] Furthermore, the lifting device includes a first driving member and a second driving member, the first driving member is used to drive the upper cover shell and the lower cover shell to move in the vertical direction, and the second driving member is used to drive the driving rod to move in the vertical direction.

[0014] Furthermore, there are multiple cover grabbing devices, and the multiple cover grabbing devices are arranged in a ring shape along the horizontal direction.

[0015] The present invention has the following advantages compared to the prior art:

[0016] The cap-grabbing device and rotary capping machine of the present invention utilize three cap-gripping heads arranged in a ring on the cap-grabbing assembly, which facilitates alignment of the axis of the cap-grabbing assembly with the axis of the bottle cap, thereby facilitating centering and positioning of the bottle cap. Furthermore, a third spring elastically connects the upper and lower cap shells, providing a buffering effect when downward pressure is applied, preventing deformation of the bottle cap caused by significant impact forces. This facilitates centering and positioning of the bottle cap and ensures its quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 2 is a cross-sectional view of a cover grabbing device according to an embodiment.

[0018] Figure 2 2 is a cross-sectional view of a grab cover assembly according to an embodiment.

[0019] Figure 3 Schematic diagram of a rotary capping machine according to an embodiment.

[0020] In the picture:

[0021] 1. Upper cover shell; 10. Upper connecting hole; 2. Lower cover shell; 20. Lower connecting hole; 21. Spring seat; 22. Third spring; 23. Sleeve; 24. Guide screw; 3. Clamping cover head; 30. Clamping cover colloid; 31. Slot; 32. Abutment surface; 33. Guide key; 4. Drive assembly; 40. Drive rod; 401. Boss; 41. First connecting rod; 410. Protrusion; 42. Second connecting rod; 420. Abutment; 43. First spring; 44. First adjusting nut; 45. Second spring; 46. Second adjusting nut; 5. Connecting cover shell; 50. Guide hole; 6. Rotating device; 7. First push rod; 8. Second push rod. DETAILED DESCRIPTION

[0022] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figures 1 to 3As shown, the present invention provides a cap grabbing device for grabbing bottle caps, comprising an upper cover shell 1, a lower cover shell 2, a cap grabbing assembly and a driving assembly 4. The upper cover shell 1 is provided with an upper communicating hole 10 passing through its upper and lower surfaces, and the lower cover shell 2 is provided with a lower communicating hole 20 passing through its upper and lower surfaces. The upper cover shell 1 and the lower cover shell 2 are elastically connected along the vertical direction. The cap grabbing assembly includes three cap clamping heads 3, which are evenly arranged in a circle around the lower communicating hole 20, and the first ends of the three cap clamping heads 3 extend from the lower end of the lower communicating hole 20 to the outside of the lower cover shell 2. The driving assembly 4 includes two first connecting rods 41 and a second connecting rod 42 that can move fairly well. The first connecting rod 41 and the second connecting rod 42 both pass through the upper communicating hole 10 and the lower communicating hole 20 and are connected to the three cap clamping heads 3. The first connecting rod 41 and the second connecting rod 42 can drive the three cap clamping heads 3 to clamp or loosen the bottle cap. It is understood that the cap grabbing assembly is composed of three cap clamping heads 3, which are arranged in a ring shape along the horizontal direction and are driven by the driving assembly 4 to move closer to or away from each other to clamp or loosen the bottle cap. When clamping the bottle cap, the three cap clamping heads 3 are respectively located at the periphery of the bottle cap. The three-point positioning makes the axis of the bottle cap coincide with the axis of the cap grabbing assembly, which facilitates the centering of the bottle cap during the capping operation. At the same time, after grabbing the bottle cap and docking the bottle cap with the bottle body, it is necessary to apply a certain pressure to the bottle cap in the vertical direction to connect the bottle cap with the bottle mouth of the bottle body. Because the upper cover shell 1 and the lower cover shell 2 are elastically connected, an elastic member is provided between the two. When the pressure is transmitted, the elastic member can buffer the pressure, reduce the impact on the bottle cap, and thus prevent the bottle cap from being deformed due to a large impact force.

[0024] In this embodiment, refer to Figure 1As shown, the upper and lower cover shells 1 and 2 are rotating structures for mounting the cover grabbing assembly and drive assembly 4, both serving as a supporting base. Upper and lower cover shells 1 and 2 are respectively provided with upper and lower communication holes 10 and 20 extending through their upper and lower surfaces. The drive assembly 4 and the cover grabbing assembly are mounted within these holes. The upper and lower communication holes 10 and 20 are provided with corresponding steps to meet installation requirements. The upper and lower covers 1 and 2 are coaxially arranged vertically, spaced apart from each other. A connecting cover 5, a spring seat 21, and a sleeve 23 are also provided between the upper and lower covers 1 and 2. The connecting cover 5 is threadedly connected to the lower end of the upper cover 1 and the upper end of the lower cover 2, respectively. The connecting cover 5 is slidably connected to the upper end of the lower cover 2 via a guide key 33, allowing relative vertical movement between the upper and lower covers 1 and transmitting torque horizontally. A spring seat 21 is mounted on the upper end of the lower cover 2 and is used to mount a spring. A mounting groove corresponding to the spring is provided on the spring seat 21. A sleeve 23 is provided between the spring seat 21 and the upper cover 1, with a gap between the sleeve 23 and the upper cover 1. A third spring 22 is provided between the spring seat 21 and the upper cover shell 1, thereby elastically connecting the upper cover shell 1 and the lower cover shell 2 via the third spring 22. When downward pressure is applied to the bottle cap, the upper cover shell 1 and the lower cover shell 2 approach each other, compressing the third spring 22, causing the upper cover shell 1 and the upper end of the sleeve 23 to abut. When the pressure is removed, the upper cover shell 1 and the sleeve 23 separate under the elastic force of the third spring 22. The drive assembly 4 includes a drive rod 40, a first connecting rod 41, and a second connecting rod 42. The drive rod 40 is connected to an external power device and provides axial thrust to the first connecting rod 41 and the second connecting rod 42, thereby causing the first connecting rod 41 and the second connecting rod 42 to move in a vertical direction. The drive rod 40 is provided with a second adjusting nut 46, which can be used to adjust the travel of the drive rod 40. The first connecting rod 41 is provided with a through hole for inserting the second connecting rod 42, and the lower end of the first connecting rod 41 is provided with a protrusion 410. The second connecting rod 42 is inserted into the through hole, and the upper end of the second connecting rod 42 is located in the through hole. The lower end of the second connecting rod 42 extends from the lower end of the first connecting rod 41, and the lower end of the second connecting rod 42 is provided with an abutment 420. The driving rod 40 is provided with a boss 401 at one end near the first connecting rod 41, and the intersection of the boss 401 and the end of the first connecting rod 41 forms a step surface. The boss 401 is inserted into the through hole at the upper end of the first connecting rod 41 and is spaced from the second connecting rod 42 in the through hole. A first spring 43 is provided between the boss 401 and the second connecting rod 42. The first spring 43 is continuously in a compressed state so that the elastic force of the first spring 43 can drive the abutment 420 of the second connecting rod 42 to abut against the abutment surface 32 of the clamping cap head 3. The clamping cap head 3 is installed in the lower connecting hole 20 of the lower cover shell 2, and the three clamping cap heads 3 are distributed in an annular manner so that the bottle cap can be clamped between the three clamping cap heads 3.The first end of the clamping head 3 extends out of the lower communicating hole 20, and the first end of the clamping head 3 is provided with a clamping colloid 30 on the contact surface with the bottle cap. The clamping colloid 30 can be made of rubber material or plastic material, which plays a protective role for the bottle cap and increases the friction between the clamping head 3 and the bottle cap to facilitate torque transmission. The second end of the clamping head 3 is provided with a draw-in slot 31, and the protrusion 410 on the first connecting rod 41 is connected to the draw-in slot 31 and is used to transmit power. When the bottle cap is released, the driving rod 40 moves downward, the protrusion 401 compresses the first spring 43, and the step surface at the lower end of the driving rod 40 abuts the upper end face of the first connecting rod 41 and pushes the first connecting rod 41 downward. At this time, the first connecting rod 41 can move downward relative to the second connecting rod 42. The first connecting rod 41 drives the clamping head 3 to rotate around the connection between the abutment surface 32 and the second connecting rod 42 through the protrusion 410, so that the three clamping heads 3 are separated from each other, realizing the release of the cap grasping assembly. When clamping the bottle cap, the driving rod 40 moves upward, the stepped surface disengages from the upper end surface of the first connecting rod 41, the boss 401 moves upward and can continue to compress the first spring 43, causing the second connecting rod 42 to abut against the abutment surface 32 of the cap clamping head 3. The first connecting rod 41 moves upward under the elastic force of the second spring 45, and drives the cap clamping head 3 to rotate about the connection between the abutment surface 32 and the second connecting rod 42 through the boss 410, so that the three cap clamping heads 3 approach each other and achieve the clamping of the cap assembly. A guide screw 24 is provided between the lower cover shell 2 and the cap clamping head 3. The lower cover shell 2 is provided with a screw hole that cooperates with the guide screw 24. The cap clamping head 3 is provided with a guide groove for the guide screw 24 to be inserted. The guide groove is arranged in the vertical direction. The guide screw 24 is installed in the screw hole and one end of the guide screw 24 is inserted into the guide groove. The guide screw 24 can move vertically along the guide groove. This structure enables the cap clamping head 3 to move up and down relative to the lower cover shell 2, and at the same time, torque can be transmitted through the guide screw 24, so that the cap grasping assembly rotates synchronously with the lower cover shell 2 to screw the bottle cap onto the bottle body.

[0025] It should be noted that the first end and the second end of the capping head 3 are arranged opposite to each other.

[0026] Specifically, refer to Figure 2As shown, the second end of the clamping cover head 3 is provided with a card slot 31, and an abutment surface 32 is provided between the first end and the second end of the clamping cover head 3, which is at an angle to the horizontal plane. The first connecting rod 41 is provided with a through hole connecting its two ends, and the second connecting rod 42 is passed through the through hole, and the lower end of the second connecting rod 42 is located outside the through hole. The lower end of the first connecting rod 41 is provided with a protrusion 410, and the first connecting rod 41 and the clamping cover head are plugged into the protrusion 410 and the card slot 31. The lower end of the second connecting rod 42 is provided with an abutment portion 420 that cooperates with the abutment surface 32, and the second connecting rod 42 and the clamping cover head 3 abut against the abutment surface 32 through the abutment portion 420. In this embodiment, the first connecting rod 41 and the second connecting rod 42 are respectively connected to the second end and the middle position of the clamping head 3, and the abutment surface 32 located at the middle position of the clamping head serves as the rotation fulcrum of the clamping head 3. When the first connecting rod 41 drives the second end of the clamping head 3 to move up and down, the first end of the clamping head 3 can rotate around the connection position between the abutment surface 32 and the second connecting rod 42 under the action of the inclined abutment surface 32, so that the three clamping heads 3 move away from or close to each other, thereby achieving the loosening and clamping of the bottle cap.

[0027] Specifically, the upper end of the second connecting rod 42 is located in the through hole of the first connecting rod 41, and a driving rod 40 is provided at the upper end of the first connecting rod 41. One end of the driving rod 40 is inserted into the through hole, and a first spring 43 is provided between the driving rod 40 and the second connecting rod 42. The driving rod 40 can compress the first spring 43 and make the second connecting rod 42 abut against the clamping head 3, and the driving rod 40 can selectively abut against the upper end of the first connecting rod 41, so that the driving rod 40 can drive the first connecting rod 41 and the second connecting rod 42 to move in the vertical direction. In this embodiment, a through hole is provided on the first connecting rod 41, and the second connecting rod 42 is passed through the through hole, and the lower end of the first connecting rod 41 and the lower end of the second connecting rod 42 are respectively connected to the slot 31 and the abutment surface 32 of the clamping head 3, and a boss 401 and a step surface are provided at one end of the driving rod 40 close to the through hole. The boss 401 is inserted into the through hole to compress the first spring 43. The downward movement of the driving rod 40 can drive the two connecting rods to move at the same time, and the first spring 43 can be used to make relative movement between the two connecting rods, thereby driving the clamping head 3 to rotate, thereby realizing the loosening and clamping of the cover grabbing assembly.

[0028] Specifically, the upper end of the first connecting rod 41 is sleeved with a first adjusting nut 44, and a second spring 45 is provided between an end surface of the lower cover shell 2 close to the upper cover shell 1 and the first adjusting nut 44. When the first connecting rod 41 moves downward, the first adjusting nut 44 can compress the second spring 45, and the second spring 45 can drive the first connecting rod 41 to move upward. In this embodiment, when the cap grabbing assembly is released, the driving rod 40 moves downward, its stepped surface abuts against the first connecting rod 41 and pushes the cap clamping head 3 to rotate to the loosened position. When the cap grabbing assembly is clamped, the driving rod 40 moves upward, its stepped surface disengages from the first connecting rod 41, and the elastic force of the second spring 45 pushes the first adjusting nut 44 upward, thereby causing the first connecting rod 41 to move upward and drive the cap clamping head 3 to rotate to the clamping position. The three cap clamping heads 3 approach each other and clamp the bottle cap. At this time, the clamping force of the three cap-gripping heads 3 on the bottle cap comes from the elastic force of the second spring 45. The compression of the second spring 45 can be changed by adjusting the first adjusting nut 44, thereby adjusting the clamping force of the cap-gripping heads 3 on the bottle cap. This structure, by providing the second spring 45 to provide clamping force for the cap-grabbing assembly, helps protect the bottle cap and prevent deformation of the bottle cap caused by excessive clamping force.

[0029] Specifically, a third spring 22 is provided between the upper cover shell 1 and the lower cover shell 2. The upper cover shell 1 and the lower cover shell 2 can compress the third spring 22 and selectively abut the opposite ends of the upper cover shell 1 and the lower cover shell 2. In this embodiment, the upper cover shell 1 and the lower cover shell 2 are elastically connected by the third spring 22. After the cap-grabbing device clamps the bottle cap, it is transferred to the bottle body and the bottle cap is aligned with the bottle mouth on the bottle body, and downward pressure is applied to cause the bottle cap to be sleeved on the bottle mouth. When pressure is applied, the upper cover shell 1 moves downward and compresses the third spring 22, and drives the lower cover shell 2 to move downward. The lower cover shell 2 abuts against the cap-grabbing assembly and drives the cap-grabbing assembly downward to cause the bottle cap to be sleeved on the bottle mouth. This structure, by providing the third spring 22, elastically connects the upper cover shell 1 and the lower cover shell 2, acting as a buffer when transmitting power downward, thereby preventing the bottle cap from being deformed due to excessive impact force.

[0030] Specifically, the cover-grabbing device also includes a connecting cover shell 5, to which the upper cover shell 1 and the lower cover shell 2 are connected at opposite ends. The connecting cover shell 5 is provided with an internal thread on the side of the connecting cover shell 5 near the upper cover shell 1, and the upper cover shell 1 is provided with an external thread that mates with the internal thread. The connecting cover shell 5 and the upper cover shell 1 are fixedly connected by the internal and external threads. The connecting cover shell 5 is provided with a guide hole 50 on the side of the connecting cover shell 5 near the lower cover shell 2, and the lower cover shell 2 is provided with a guide key 33 that mates with the guide hole 50. The guide key 33 is plugged into the guide hole 50 and can slide along the length of the guide hole 50. The connecting cover shell 5 and the lower cover shell 2 are slidably connected via the guide hole 50 and the guide key 33. In this embodiment, the connecting cover shell 5 has a cylindrical structure, and the two ends of the connecting cover shell 5 are respectively sleeved on the opposite ends of the upper cover shell 1 and the lower cover shell 2. The guide key 33 slides vertically along the guide hole 50. The guide key 33 is annularly arranged around the circumference of the lower cover shell 2 and is mounted on the lower cover shell 2 by fastening screws. The guide key 33 is provided to enable the lower cover shell 2 and the upper cover shell 1 to move relative to each other in the vertical direction, and the upper cover shell 1 can transmit torque to the lower cover shell 2 through the guide key 33 .

[0031] Specifically, refer to Figure 2 As shown, a cap-gripping colloid 30 is provided on the side of the cap-gripping head 3 facing the bottle cap. The cap-gripping colloid 30 is provided in cooperation with the bottle cap and has a hardness less than that of the bottle cap. It is understood that the cap-gripping colloid 30 is provided on the contact surface between the cap-gripping head 3 and the bottle cap and is made of an elastic rubber material to facilitate gripping of the bottle cap and improve stability when gripping the bottle cap.

[0032] The significant effect of this embodiment is that the three cap-gripping heads 3 are arranged in a ring on the cap-grabbing assembly, which facilitates the alignment of the axis of the cap-grabbing assembly with the axis of the bottle cap, thereby facilitating the centering and positioning of the bottle cap. At the same time, the upper cover shell 1 and the lower cover shell 2 are elastically connected by a third spring 22, which acts as a buffer when downward pressure is applied, preventing the bottle cap from being deformed by a large impact force, thereby facilitating the centering and positioning of the bottle cap and ensuring the quality of the bottle cap.

[0033] A rotary capping machine is also provided, comprising the aforementioned capping device, a lifting device, and a rotating device 6. The lifting device is connected to the drive rod 40 of the capping device, and can drive the drive rod 40 to move vertically. The rotating device 6 is connected to the upper cover shell 1, and can drive the capping device to rotate horizontally about its axis. In this embodiment, the lifting device is used to drive the capping device to move vertically, and the rotating device 6 is used to drive the capping device to rotate horizontally about its axis. This enables the capping device to grasp the bottle cap and rotate the bottle cap horizontally to thread the bottle cap into the bottle body.

[0034] Specifically, refer to Figure 3As shown, the lifting device includes a first driving member and a second driving member. The first driving member is used to drive the upper cover shell 1 and the lower cover shell 2 in a vertical direction, and the second driving member is used to drive the driving rod 40 in a vertical direction. In this embodiment, the first driving member includes a driving cylinder and a first push rod 7 connected to the driving cylinder. The driving cylinder drives the first push rod 7 in a vertical direction. The first push rod 7 is connected to the driving rod 40 of the cap-grabbing device. The driving cylinder and the first push rod 7 drive the driving rod 40 to move, thereby clamping and releasing the cap-grabbing assembly. The second driving member includes a cam and a second push rod 8. The second push rod 8 is movably connected to the cam. The cam is provided with a guide groove that matches the motion trajectory of the second push rod 8. The second push rod 8 is rolled in the guide groove. When the cam rotates, it drives the second push rod 8 in a vertical direction. The second push rod 8 is connected to the upper cover shell 1 of the cap-grabbing device and drives the upper cover shell 1 and the lower cover shell 2 in a vertical direction, thereby applying downward pressure on the bottle cap to mate with the bottle mouth.

[0035] Specifically, the rotating device 6 is arranged between the lifting device and the cover grabbing device. The rotating device 6 includes a first shell and a second shell that can rotate relative to each other. The first shell and the second shell can rotate coaxially, wherein the first shell is connected and fixed to the lifting device, and the second shell is connected and fixed to the cover grabbing device, and the relative rotation between the two shells drives the cover grabbing device to rotate around its own axis.

[0036] Specifically, there are multiple cap grabbing devices, which are arranged in a horizontal ring. It can be understood that multiple cap grabbing devices can simultaneously grab multiple bottle caps, thereby improving packaging operation efficiency.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A cap grabbing device for installing bottle caps, characterized in that: The bottle cap bottle bottle comprises an upper cover shell, a lower cover shell, a cover grabbing assembly and a driving assembly, wherein the upper cover shell is provided with an upper communicating hole passing through the upper and lower surfaces thereof, and the lower cover shell is provided with a lower communicating hole passing through the upper and lower surfaces thereof, the upper cover shell and the lower cover shell are elastically connected in the vertical direction, the cover grabbing assembly comprises three cover clamping heads, the three cover clamping heads are evenly arranged in an annular manner on the lower communicating hole, and the first ends of the three cover clamping heads extend from the lower end of the lower communicating hole to the outside of the lower cover shell, the driving assembly comprises two first connecting rods and a second connecting rod capable of relative movement, the first connecting rod and the second connecting rod both pass through the upper communicating hole and the lower communicating hole and are connected to the three cover clamping heads, the first connecting rod and the second connecting rod can drive the three cover clamping heads to clamp or loosen the bottle cap; The second end of the clamping cover head is provided with a card slot, and an abutment surface is provided between the first end and the second end of the clamping cover head, which is at an angle to the horizontal plane. The first connecting rod is provided with a through hole connecting the two ends thereof, the second connecting rod is passed through the through hole, and the lower end of the second connecting rod is located outside the through hole, the lower end of the first connecting rod is provided with a convex portion, the first connecting rod and the clamping cover head are plugged into the convex portion and the card slot, the lower end of the second connecting rod is provided with an abutment portion that matches the abutment surface, and the second connecting rod and the clamping cover head abut against the abutment surface through the abutment portion; The upper end of the second connecting rod is located in the through hole. A driving rod is provided at the upper end of the first connecting rod. One end of the driving rod is inserted into the through hole. A first spring is provided between the driving rod and the second connecting rod. The driving rod can compress the first spring and make the second connecting rod abut against the clamping cover head. The driving rod can selectively abut against the upper end of the first connecting rod, so that the driving rod can drive the first connecting rod and the second connecting rod to move in the vertical direction. A first adjusting nut is sleeved on the upper end of the first connecting rod, and a second spring is provided between an end surface of the lower cover shell close to the upper cover shell and the first adjusting nut; When the bottle cap is released, the driving rod moves downward, the boss compresses the first spring, and the step surface at the lower end of the driving rod abuts against the upper end surface of the first connecting rod, pushing the first connecting rod downward. At this time, the first connecting rod moves downward relative to the second connecting rod, and the first connecting rod drives the clamping head to rotate around the connection between the abutment surface and the second connecting rod through the boss, so that the three clamping heads move away from each other, realizing the loosening of the clamping cap assembly; when the bottle cap is clamped, the driving rod moves upward, the step surface disengages from the upper end surface of the first connecting rod, and the boss moves upward and can continue to compress the first spring, so that the second connecting rod abuts against the abutment surface of the clamping head, and the first connecting rod moves upward under the elastic force of the second spring, and drives the clamping head to rotate around the connection between the abutment surface and the second connecting rod through the boss, so that the three clamping heads move close to each other, realizing the clamping of the clamping cap assembly.

2. The cover grabbing device according to claim 1, characterized in that: When the first connecting rod moves downward, the first adjusting nut can compress the second spring, and the second spring can drive the first connecting rod to move upward.

3. The cover grabbing device according to claim 1, characterized in that: A third spring is provided between the upper cover and the lower cover. The upper cover and the lower cover can compress the third spring and selectively abut opposite ends of the upper cover and the lower cover.

4. The cover grabbing device according to claim 3, characterized in that: The cam is secured to the upper and lower covers by means of an internal thread, and the cam is secured to the lower cover by means of an external thread.

5. The cover grabbing device according to claim 1, characterized in that: A cap clamping colloid is provided on a side of the cap clamping head facing the bottle cap. The cap clamping colloid is matched with the bottle cap, and the hardness of the cap clamping colloid is less than the hardness of the bottle cap.

6. A rotary capping machine, comprising the cap grabbing device according to any one of claims 1 to 5, characterized in that: It also includes a lifting device and a rotating device, the lifting device is connected to the driving rod of the cover grabbing device, the lifting device can drive the driving rod to move in the vertical direction, the rotating device is connected to the upper cover shell, and the rotating device can drive the cover grabbing device to rotate horizontally around the axis of the cover grabbing device.

7. The rotary capping machine according to claim 6, characterized in that: The lifting device includes a first driving member and a second driving member, wherein the first driving member is used to drive the upper cover shell and the lower cover shell to move in a vertical direction, and the second driving member is used to drive the driving rod to move in a vertical direction.

8. The rotary capping machine according to claim 6, characterized in that: There are multiple cover grabbing devices, and the multiple cover grabbing devices are arranged in a ring along the horizontal direction.

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