Clamping jaw structure controlled by single motor

Abstract

The invention provides a clamping jaw structure controlled by a single motor, and belongs to the technical field of machinery. The problem that an existing clamping jaw needs two power components to achieve clamping and rotating is solved. The clamping jaw structure controlled by the single motor comprises a framework, the motor arranged on the framework, a rotating piece rotationally arranged in the framework and a pre-tightening structure used for temporarily positioning the rotating piece, and a plurality of clamping jaws distributed along the rotating center line of the rotating piece in an annular array mode are arranged on the rotating piece in a sliding mode. A transmission structure driven by the motor is arranged between the clamping jaws and the motor, when the transmission structure rotates forwards, the multiple clamping jaws can be driven to move inwards synchronously, and when the multiple clamping jaws clamp an object, the transmission structure drives the rotating piece and the multiple clamping jaws to rotate together. Clamping and rotating are achieved only through one motor, and cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a clamping claw structure controlled by a single motor. Background Art

[0002] In the process of testing or inspecting blood in hospitals, laboratories or scientific research institutions, it is necessary to open the top cover of the blood collection tube, usually manually or semi-automatically. Manual opening may cause blood contamination, and manual opening is inefficient and labor-intensive; using a semi-automatic opening device still requires manual operation, and the opening efficiency is not significantly improved.

[0003] To this end, a Chinese patent discloses a cover opening device and a cover opening system [authorization announcement number is CN108408670B], including a frame and an upper clamping jaw mechanism; the upper clamping jaw mechanism includes an upper clamping jaw assembly, an upper clamping drive assembly and a rotation drive assembly, and the driving ends of the upper clamping drive assembly and the rotation drive assembly are both connected to the upper clamping jaw assembly, which respectively drive the upper clamping jaw assembly to clamp and rotate, so that the upper clamping jaw mechanism can realize automatic clamping and rotation of the blood collection tube cover, thereby improving the efficiency of opening and closing the cover.

[0004] However, in the above device, the clamping and screwing of the upper clamping jaws are driven by the upper clamping drive assembly and the rotation drive assembly respectively, and two power components are used, which increases the cost. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a single-motor controlled clamping jaw structure that can achieve clamping and rotation by only one motor.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A single-motor controlled clamping structure comprises a frame, a motor arranged on the frame, a rotating member rotatably arranged in the frame, and a pre-tightening structure for temporarily positioning the rotating member. The rotating member is slidably provided with a plurality of clamping jaws distributed in a circular array along the rotation center line of the rotating member. A transmission structure driven by the motor is arranged between the clamping jaw and the motor. When the transmission structure rotates forward, it can drive the plurality of clamping jaws to move inward synchronously. Only when the plurality of clamping jaws clamp an object, the transmission structure drives the rotating member and the plurality of clamping jaws to rotate together.

[0008] The rotation centerline of the transmission structure coincides with the rotation centerline of the rotating part. When the motor is working, it will drive the transmission structure to rotate. The positive rotation of the transmission structure will drive several clamps to move inward synchronously to clamp the object. When the object is clamped, the transmission structure will drive the rotating part and several clamps to rotate together. The reverse rotation of the transmission structure will drive several clamps to move outward synchronously to release the object. It only uses one motor to achieve clamping and rotation, which reduces costs.

[0009] In the above-mentioned single-motor controlled clamping structure, the transmission structure includes a pitch disc coaxially arranged on the rotating shaft of the motor and a groove wheel arranged on the clamping jaw, the pitch disc is provided with a plurality of guide grooves distributed in a circular array along the rotation center line of the pitch disc, the guide grooves are arranged to be inclined relative to the radial direction of the pitch disc, the groove wheel extends upward into the guide groove opposite thereto, and when the pitch disc rotates in the forward direction, the guide groove can drive the groove wheel to move toward the inner end of the guide groove.

[0010] When the motor is working, it will drive the pitch disc to rotate. When the pitch disc rotates forward, the guide groove can drive the groove wheel to move toward the inner end of the guide groove to clamp the object. When the pitch disc rotates reversely, the guide groove can drive the groove wheel to move toward the outer end of the guide groove to release the object.

[0011] In the above-mentioned single-motor controlled clamping structure, the rotating member is provided with a plurality of guide rails equal in number to the clamping jaws and extending radially along the rotating member, each of the guide rails is slidably provided with a slider, and the clamping jaws are fixed on the slider corresponding thereto.

[0012] A plurality of guide rails are distributed in a circular array along the rotation centerline of the rotating member, and a plurality of sliders are also distributed in a circular array along the rotation centerline of the rotating member, so that a plurality of clamps are distributed in a circular array along the rotation centerline of the rotating member. Under the action of the transmission structure, the sliders can slide along the guide rails that are matched therewith, thereby realizing radial movement of each clamp along the rotating member.

[0013] In the above-mentioned single-motor controlled clamp structure, the clamp is located directly below the corresponding guide rail, and the clamp is provided with two connecting parts extending upward to both sides of the slider, and the connecting parts are fixedly connected to the slider, thereby improving the stability of the clamp.

[0014] In the above-mentioned single-motor controlled clamping jaw structure, the groove wheel is rotatably arranged on the slider.

[0015] The outer diameter of the sheave is equal to the width of the guide groove. When the pitch disc rotates, the sheave slides in the guide groove and rotates around its own center line, thereby reducing friction.

[0016] In the above-mentioned clamping structure controlled by a single motor, a limit seat is provided in the middle of the rotating member, and an elastic member extending radially along the rotating member is provided between the limit seat and the slider.

[0017] The elastic member is a spring, and the elastic force of the elastic member acts on the slider. When the pitch disc reverses, the elastic member can make the slider move outward quickly.

[0018] In the above-mentioned single-motor controlled clamping structure, the limit seat is provided with a plurality of guide holes arranged one by one opposite to the sliders, the slider is fixedly connected with a guide rod slidingly inserted into the guide holes opposite to it, and the elastic member is sleeved on the guide rod.

[0019] The guide rod guides and limits the spring. When the pitch disc rotates forward, the slider moves toward the inner end of the guide rail, the spring is compressed, and the guide rod moves toward the inner end of the guide hole.

[0020] In the above-mentioned single-motor controlled clamping jaw structure, an annular guide groove is provided inside the lower end of the frame, a follower ring is rotatably fitted in the annular guide groove, a plurality of radial guide grooves are provided inside the follower ring, the number of which is equal to the number of the clamping jaws and which are arranged one-to-one, and the lower end of the clamping jaw is slidably fitted in the radial guide grooves arranged correspondingly thereto. The lower end of the clamping jaw is guided by the radial guide grooves, thereby improving the stability of the clamping jaw.

[0021] In the above-mentioned single-motor controlled clamping structure, the pre-tightening structure is arranged between the follower ring and the frame. The pre-tightening structure includes a ratchet arranged on the outer ring of the follower ring and a pawl arranged in the annular guide groove. When rotating forward, the ratchet can pass over the pawl.

[0022] The follower ring is connected to the ratchet wheel, that is, the ratchet wheel is formed by setting ratchet teeth on the outer ring of the follower ring. The pawl exerts a certain pressure on the ratchet wheel. When the clamping jaws do not clamp objects and the pitch disc rotates, the follower ring cannot be driven to rotate together. Only when the clamping jaws clamp objects, the rotation of the pitch disc will drive the follower ring to rotate together. When the pitch disc rotates in the opposite direction, the pawl blocks the ratchet wheel to prevent the ratchet wheel from rotating.

[0023] In the above-mentioned single-motor controlled clamp structure, the skeleton includes a cylindrical skeleton tube, a skeleton disk arranged above the skeleton tube, and a connecting column for connecting the skeleton tube and the skeleton disk. The lower end of the clamp extends into the skeleton tube, and the motor is fixed on the skeleton disk. The connecting columns are multiple and evenly distributed along the circumference of the skeleton tube. The inner side of the connecting column is provided with a groove, and the plurality of grooves constitute an annular groove that cooperates with the rotating part for rotation.

[0024] The annular groove is used to support and limit the rotating member, thereby improving the stability of the rotating member. The annular guide groove is arranged in the frame tube.

[0025] Compared with the prior art, the single-motor controlled clamping jaw structure has the following advantages: the clamping and rotation of the clamping jaw are achieved by only one motor, which reduces the cost; the overall structural design is reasonable, the structural stability is good, the assembly is convenient, and the blood collection tube can be effectively clamped, and the blood collection tube can be uncapped in conjunction with the rotating action. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a gripper structure controlled by a single motor.

[0027] Figure 2 It is a schematic diagram of the structure of a single-motor controlled gripper structure without the frame.

[0028] Figure 3It is a diagram showing the coordination relationship among the rotating part, the clamping claw and the ratchet.

[0029] Figure 4 This is a top view of the pitch disc.

[0030] Figure 5 It is a cross-sectional view of a single-motor controlled gripper structure through a ratchet.

[0031] In the figure, 1, motor; 2, rotating part; 3, clamping claw; 4, pitch disc; 5, groove wheel; 6, guide groove; 7, guide rail; 8, slider; 9, connecting part; 10, limit seat; 11, elastic part; 12, guide rod; 13, annular guide groove; 14, radial guide groove; 15, ratchet; 16, pawl; 17, skeleton tube; 18, skeleton disc; 19, connecting column; 20, slot. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1 The single-motor controlled clamp structure shown includes a frame, a motor 1 arranged on the frame, a rotating part 2 rotatably arranged in the frame, and a pre-tightening structure for temporarily positioning the rotating part 2. The frame includes a cylindrical frame tube 17, a frame disk 18 arranged above the frame tube 17, and connecting columns 19 for connecting the frame tube 17 and the frame disk 18. There are three connecting columns 19 and they are evenly distributed along the circumference of the frame tube 17. The motor 1 is fixed on the frame disk 18.

[0034] like Figure 1 As shown, the inner side of the connecting column 19 is provided with a slot 20, and the plurality of slots 20 form an annular groove that rotates with the rotating member 2, and the rotating member 2 is supported and limited by the annular groove, thereby improving the stability of the rotating member 2. Among them, the annular guide groove 13 is arranged in the frame tube 17.

[0035] like Figure 2 and Figure 3 As shown, a plurality of clamping jaws 3 are slidably provided on the rotating member 2 and are distributed in a circular array along the rotation center line of the rotating member 2. The lower ends of the clamping jaws 3 extend into the frame tube 17. A transmission structure driven by the motor 1 is provided between the clamping jaws 3 and the motor 1. When the transmission structure rotates forward, it can drive the plurality of clamping jaws 3 to move inward synchronously. Only when the plurality of clamping jaws 3 clamp objects, the transmission structure drives the rotating member 2 and the plurality of clamping jaws 3 to rotate together.

[0036] The rotation centerline of the transmission structure coincides with the rotation centerline of the rotating member 2. When the motor 1 is working, it will drive the transmission structure to rotate. The positive rotation of the transmission structure will drive the plurality of clamps 3 to move inward synchronously to clamp the object. When the object is clamped, the transmission structure will drive the rotating member 2 and the plurality of clamps 3 to rotate together. When the transmission structure is reversed, it will drive the plurality of clamps 3 to move outward synchronously to release the object. It realizes clamping and rotation through only one motor 1, which reduces the cost.

[0037] like Figure 2 As shown, the transmission structure includes a pitch disc 4 coaxially arranged on the rotating shaft of the motor 1 and a groove wheel 5 arranged on the clamping jaw 3. The pitch disc 4 is provided with three guide grooves 6 distributed in a circular array along the rotation center line of the pitch disc 4. Figure 4 As shown, the guide groove 6 is tilted relative to the radial direction of the pitch disc 4, and the sheave 5 extends upward into the guide groove 6 opposite thereto. When the pitch disc 4 rotates forward, the guide groove 6 can drive the sheave 5 to move toward the inner end of the guide groove 6. When the motor 1 is working, it will drive the pitch disc 4 to rotate. When the pitch disc 4 rotates forward, the guide groove 6 can drive the sheave 5 to move toward the inner end of the guide groove 6 to clamp the object. When the pitch disc 4 rotates reversely, the guide groove 6 can drive the sheave 5 to move toward the outer end of the guide groove 6 to release the object.

[0038] like Figure 3 As shown, the rotating member 2 is provided with three guide rails 7, which are equal in number to the clamping jaws 3 and extend radially along the rotating member 2. A slider 8 is slidably provided on each guide rail 7, and the clamping jaws 3 are fixed on the slider 8 corresponding thereto. A plurality of guide rails 7 are distributed along the rotating centerline annular array of the rotating member 2, and a plurality of sliders 8 are also distributed along the rotating centerline annular array of the rotating member 2, so that a plurality of clamping jaws 3 are distributed along the rotating centerline annular array of the rotating member 2. Under the action of the transmission structure, the slider 8 can slide along the guide rail 7 provided therewith, so as to realize the radial movement of each clamping jaw 3 along the rotating member 2.

[0039] like Figure 3 As shown, the clamping jaw 3 is located directly below the guide rail 7 corresponding thereto, and the clamping jaw 3 is provided with two connecting portions 9 extending upward to both sides of the slider 8 respectively, and the connecting portions 9 are fixedly connected to the slider 8, thereby improving the stability of the clamping jaw 3.

[0040] In this embodiment, the sheave 5 is rotatably arranged on the slider 8. The outer diameter of the sheave 5 is equal to the width of the guide groove 6. When the pitch disc 4 rotates, the sheave 5 slides in the guide groove 6 and rotates around its own center line, thereby reducing friction.

[0041] like Figure 3 As shown, a limit seat 10 is provided in the middle of the rotating member 2, and an elastic member 11 extending radially along the rotating member 2 is provided between the limit seat 10 and the slider 8. The elastic member 11 is a spring, and the elastic force of the elastic member 11 acts on the slider 8. When the pitch disc 4 reverses, the elastic member 11 can make the slider 8 move outward quickly.

[0042] In this embodiment, the limit seat 10 is provided with a plurality of guide holes arranged one by one with the sliders 8, the sliders 8 are fixedly connected with guide rods 12 which are slidably arranged in the guide holes opposite thereto, and the elastic member 11 is sleeved on the guide rods 12. The guide rods 12 guide and limit the spring, and when the pitch disc 4 rotates forward, the slider 8 moves toward the inner end of the guide rail 7, the spring is compressed, and the guide rods 12 move toward the inner end of the guide holes.

[0043] like Figure 5 As shown, an annular guide groove 13 is provided inside the lower end of the skeleton tube 17, a follower ring is rotatably fitted in the annular guide groove 13, and radial guide grooves 14 corresponding to the clamping jaws 3 are provided inside the follower ring, and the lower end of the clamping jaw 3 is slidably fitted in the radial guide grooves 14 corresponding thereto. The lower end of the clamping jaw 3 is guided by the radial guide grooves 14, thereby improving the stability of the clamping jaw 3.

[0044] In this embodiment, Figure 5 As shown, the pre-tightening structure is arranged between the follower ring and the frame, and the pre-tightening structure includes a ratchet 15 arranged on the outer ring of the follower ring and a pawl 16 arranged in the annular guide groove 13. When rotating forward, the ratchet 15 can pass over the pawl 16.

[0045] The follower ring and the ratchet 15 are connected as one, that is, the ratchet 15 is formed by setting ratchet teeth on the outer ring of the follower ring. The pawl 16 applies a certain pressure to the ratchet 15. When the clamping jaws 3 do not clamp an object and the pitch disc 4 rotates, the follower ring cannot be driven to rotate together. Only when the clamping jaws 3 clamp an object, the rotation of the pitch disc 4 will drive the follower ring to rotate together. When the pitch disc 4 rotates in the opposite direction, the pawl 16 blocks the ratchet 15 to prevent the ratchet 15 from rotating.

[0046] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A single motor controlled gripper structure, characterized in that: The invention comprises a frame, a motor (1) arranged on the frame, a rotating member (2) rotatably arranged in the frame, and a pre-tightening structure for temporarily positioning the rotating member (2); the rotating member (2) is slidably provided with a plurality of clamping jaws (3) distributed in a circular array along the rotation center line of the rotating member (2); a transmission structure driven by the motor (1) is arranged between the clamping jaws (3) and the motor (1); when the transmission structure rotates forward, the plurality of clamping jaws (3) can be driven to move inward synchronously; and when the plurality of clamping jaws (3) clamp an object, the transmission structure drives the rotating member (2) and the plurality of clamping jaws (3) to rotate together.

2. The single-motor controlled gripper structure according to claim 1, characterized in that: The transmission structure comprises a pitch disc (4) coaxially arranged on a rotating shaft of a motor (1) and a groove wheel (5) arranged on a clamping jaw (3); the pitch disc (4) is provided with a plurality of guide grooves (6) distributed in a circular array along a rotation center line of the pitch disc (4); the guide grooves (6) are arranged to be inclined relative to the radial direction of the pitch disc (4); the groove wheel (5) extends upward into the guide groove (6) opposite thereto; when the pitch disc (4) rotates in the forward direction, the guide groove (6) can drive the groove wheel (5) to move toward the inner end of the guide groove (6).

3. The single-motor controlled gripper structure according to claim 2, characterized in that: The rotating member (2) is provided with a plurality of guide rails (7) which are equal in number to the number of the clamping jaws (3) and extend radially along the rotating member (2), each of the guide rails (7) is slidably provided with a slider (8), and the clamping jaws (3) are fixed on the slider (8) correspondingly provided therewith.

4. The single-motor controlled gripper structure according to claim 3, characterized in that: The clamping jaw (3) is located directly below a guide rail (7) corresponding thereto, and the clamping jaw (3) is provided with two connecting portions (9) respectively extending upward to the two sides of the slider (8), and the connecting portions (9) are fixedly connected to the slider (8).

5. The single-motor controlled gripper structure according to claim 3, characterized in that: The groove wheel (5) is rotatably mounted on the slider (8).

6. The single-motor controlled gripper structure according to claim 3, characterized in that: A limit seat (10) is provided in the middle of the rotating member (2), and an elastic member (11) extending radially along the rotating member (2) is provided between the limit seat (10) and the sliding block (8).

7. The single-motor controlled gripper structure according to claim 6, characterized in that: The limit seat (10) is provided with a plurality of guide holes arranged one by one opposite to the sliders (8); the sliders (8) are fixedly connected with guide rods (12) which slide through the guide holes opposite to the sliders; and the elastic member (11) is sleeved on the guide rods (12).

8. The single-motor controlled gripper structure according to claim 1, characterized in that: An annular guide groove (13) is provided on the inner side of the lower end of the frame, a follower ring is rotatably fitted in the annular guide groove (13), a plurality of radial guide grooves (14) equal in number to the number of the clamping jaws (3) and arranged one-to-one are provided on the inner side of the follower ring, and the lower end of the clamping jaw (3) is slidably fitted in the radial guide groove (14) arranged correspondingly thereto.

9. The single-motor controlled gripper structure according to claim 8, characterized in that: The pre-tightening structure is arranged between the follower ring and the frame, and comprises a ratchet (15) arranged on the outer ring of the follower ring and a pawl (16) arranged in the annular guide groove (13). When rotating forward, the ratchet (15) can pass over the pawl (16).

10. The single-motor controlled gripper structure according to claim 1, characterized in that: The skeleton comprises a cylindrical skeleton tube (17), a skeleton disk (18) arranged above the skeleton tube (17), and a connecting column (19) for connecting the skeleton tube (17) and the skeleton disk (18); the lower end of the clamping jaw (3) extends into the skeleton tube (17); the motor (1) is fixed on the skeleton disk (18); the connecting columns (19) are multiple and evenly distributed along the circumference of the skeleton tube (17); the inner side of the connecting column (19) is provided with a groove (20); the plurality of grooves (20) constitute an annular groove that cooperates with the rotating member (2) for rotation.

Images