A mushroom bag mouth tightening device

Abstract

The present invention relates to a bag mouth tightening device, comprising a base, a transmission assembly, and a plurality of bag grabbing claws and mouth shrinking claws uniformly distributed in an annular array on the base; the vertical transmission assembly is rotatably fixed to the middle part of the base; a clamping claw is arranged at the lower end of the mouth shrinking claw, and the clamping claw is rotatably fixed to the base; a first driving mechanism matched with the guide of the clamping claw is arranged on the transmission assembly; the clamping claw can reciprocate along the guide of the first driving mechanism; a clamping claw is arranged at the lower end of the bag grabbing claw, and the clamping claw is slidably fixed on the base; a second driving mechanism matched with the guide of the clamping claw is arranged on the transmission assembly; the clamping claw can reciprocate along the guide of the second driving mechanism.

Description

Technical Field

[0001] The invention relates to a bag opening tightening device for a fungus bag, belonging to the technical field of automated mechanical equipment. Background Art

[0002] During the cultivation of edible fungi, many processes are required, such as putting the stirred culture medium into stick-shaped bags and sealing the bag openings. Automated packaging machinery for edible fungi sticks is becoming more and more popular in the market for its convenience in mass production.

[0003] The Chinese utility model patent "A bag tightening device and bag ring cap buckling machine" with the authorization announcement number CN209047151U includes a main clamping part and a shrinking motion mechanism arranged on the periphery of the main clamping part; the main clamping part includes a plurality of clamping hand motion mechanisms and a clamping hand linkage mechanism that drives the plurality of clamping hand motion mechanisms to synchronously close inward or open outward; the clamping hand motion mechanism includes a clamping assembly and a power unit, and the clamping assembly includes an inner claw, an outer claw and an auxiliary claw attached to one side of the outer claw, and the upper end of the auxiliary claw The auxiliary claw is movably connected to the middle part of the inner claw, the middle part of the auxiliary claw is hinged to the lower part of the outer claw, the lower parts of the outer claw and the auxiliary claw are provided with recesses opposite to the inner claw, and the end of the outer claw is provided with a clamping block that fits with the inner claw; the power unit drives the inner claw and the outer claw to open, and the auxiliary claw rotates with its upper end and the movably connected part of the inner claw as a fulcrum, so that the lower part of the auxiliary claw expands outward over the outer claw; the shrinking movement mechanism includes a plurality of locking claws and a shrinking linkage mechanism between the inner claw and the outer claw that drives the plurality of locking claws to synchronously insert or remove each clamping assembly.

[0004] However, the structures of the shrinking motion mechanism and the clamping motion mechanism in the above patent are still relatively complex, and the disassembly, assembly and maintenance are relatively cumbersome; at the same time, the linkage effect between the two is poor. Summary of the invention

[0005] In order to overcome the above-mentioned problems, the present invention provides a bag mouth tightening device, which has a simple structure and simplifies the relatively complex structure of most tightening devices currently available. In addition, the bag mouth tightening device improves the linkage effect between the bag grabbing claw and the shrinking claw through the cooperation of the main shaft with the first driving mechanism and the second driving mechanism, thereby improving the coordination of the entire device during operation.

[0006] The technical solution of the present invention is as follows:

[0007] A bag mouth tightening device for fungi, comprising a base, a transmission assembly, and a plurality of bag grabbing claws and mouth shrinking claws uniformly distributed in an annular array on the base; the vertical transmission assembly is rotatably fixed to the middle part of the base; a clamping claw is provided at the lower end of the mouth shrinking claw, and the clamping claw is rotatably fixed to the base; a first driving mechanism that cooperates with the guide of the clamping claw is provided on the transmission assembly; the clamping claw can reciprocate along the guide of the first driving mechanism; a clamping claw is provided at the lower end of the bag grabbing claw, and the clamping claw is slidably fixed to the base; a second driving mechanism that cooperates with the guide of the clamping claw is provided on the transmission assembly; the clamping claw can reciprocate along the guide of the second driving mechanism.

[0008] Furthermore, the base includes an upper fixed plate and a lower fixed plate which are arranged horizontally corresponding to each other; a plurality of vertical columns are fixed between the upper fixed plate and the lower fixed plate in a uniform annular array; the clamping claw is slidably fixed on the lower fixed plate; the clamping claw is rotatably fixed on the lower fixed plate; the transmission assembly includes a vertical main shaft and a power assembly fixed on the upper end of the main shaft; the main shaft vertically passes through the middle of the upper fixed plate and the lower fixed plate; the power assembly includes an upper cam sleeved on the upper end of the main shaft and a power gear fixed on the lower end of the upper cam; the power gear is located above the upper fixed plate; the power gear can drive the main shaft to rotate through an external gear; the first driving mechanism is arranged in the middle of the main shaft; the second driving mechanism is arranged at the lower part of the main shaft; a first cam contour line is arranged on the first driving mechanism; the first driving mechanism can drive the clamping claw to reciprocate along the guide of the first cam contour line; the second driving mechanism is arranged on the second driving mechanism; the second driving mechanism can drive the clamping claw to reciprocate along the guide of the second cam contour line.

[0009] Furthermore, the bag grabbing claw includes a vertical support arm, the clamping claw vertically fixed at the lower end of the support arm, and a fixing seat horizontally fixed at the upper end of the support arm; the clamping claw is in a fan-shaped column, and the clamping claws can be enclosed to form a complete cylindrical structure; a vertical support rod is fixed on one side of the upper end of the fixing seat, and a horizontal linear slider is fixed on the other side; a linear slide rail is fixed to the lower end of the lower fixed plate; the linear slider is slidably mounted on the linear slide rail; a plurality of vertical through bag grabbing grooves are evenly spaced on the lower fixed plate; the upper end of the support rod passes through the bag grabbing groove and is connected to the second cam contour guide; the support rod can slide in the bag grabbing groove.

[0010] Furthermore, the shrinking claw includes a vertical L-shaped connecting piece, the clamping claw vertically fixed at the lower end of the connecting piece, and a connecting rod with one end hinged to the upper end of the connecting piece; the other end of the connecting rod is guide-connected to the first driving mechanism; the lower fixed plate is evenly spaced and provided with a plurality of vertically penetrating shrinking grooves; a pressure block is fixed on the lower fixed plate on the side of the shrinking groove close to the main shaft; the middle part of the connecting piece passes through the shrinking groove, and the end of the short side of the L-shaped connecting piece is hinged to the pressure block.

[0011] Furthermore, the first driving mechanism includes an annular shrinking guide rail movably mounted on the outside of the middle part of the main shaft and a connecting arm fixed to the middle part of the main shaft at one end; a driving wheel is rotatably fixed to the other end of the connecting arm; the first cam contour line is arranged on the shrinking guide rail; the driving wheel cooperates with the first cam contour line to drive the shrinking guide rail to move up and down; the upper end of the connecting rod is hinged to the outside of the shrinking guide rail through a hinge seat; a plurality of guide rods are vertically fixed to the upper end of the shrinking guide rail; the guide rods pass through the upper fixed plate upward; a linear bearing is also sleeved between the guide rod and the upper fixed plate; the main shaft rotates, driving the driving wheel at the end of the connecting arm to move along the first cam contour line, and the shrinking guide rail moves up and down, driving the clamping claw at the lower end of the connecting piece to open and close through the connecting rod, thereby controlling the opening and closing of the shrinking claw.

[0012] Furthermore, the second driving mechanism includes a driving gear coaxially fixed to the lower part of the main shaft; a cam plate is rotatably fixed on the upper end of the lower fixed plate corresponding to each of the support rods; a driven gear is fixed to the upper end of the cam plate; the driven gear is meshed with the driving gear; the second cam contour is arranged on the cam plate; the upper end of the support rod can reciprocate along the second cam contour; the main shaft rotates, driving the driving gear to rotate, and the driven gear meshed with the driving gear drives the cam plate below to rotate, and the support rod reciprocates along the second cam contour on the cam plate, moves back and forth in the bag grabbing groove, drives the linear slider to move back and forth on the linear slide rail, and finally drives the clamping claw to move back and forth through the support arm, thereby controlling the opening and closing of the bag grabbing claw.

[0013] Furthermore, the first cam contour line is the undulating lower end surface of the shrinking guide rail; the driving wheel can roll along the undulating lower end surface of the shrinking guide rail.

[0014] Furthermore, an inverted "V"-shaped recess is opened upward at the lower end of the shrinking guide rail; the rotation of the main shaft can drive the driving wheel at the end of the connecting arm to roll along the lower end surface of the shrinking guide rail; the driving wheel enters the recess from the lower end of the shrinking guide rail, and the shrinking guide rail gradually descends due to its own gravity, and the lower end of the connecting rod opens outward, driving the upper end of the connecting piece to open outward and the lower end to retract inward, and the claws at the lower end of the connecting piece retract inward, so that the shrinking claws are closed; the driving wheel moves from the recess to the lower end of the shrinking guide rail, and the driving wheel gradually lifts the shrinking guide rail, and the lower end of the connecting rod retracts inward, driving the upper end of the connecting piece to retract inward and the lower end to open outward, and the claws at the lower end of the connecting piece open outward, so that the shrinking claws open.

[0015] Furthermore, the second cam contour line is a slide groove provided at the lower end of the cam plate; the upper end of the support rod can slide back and forth in the slide groove.

[0016] Furthermore, a cam bearing is coaxially fixed to the upper end of the support rod; the cam bearing can slide freely in the slide groove.

[0017] The present invention has the following beneficial effects:

[0018] 1. The bag mouth tightening device has a simple structure, which simplifies the relatively complex structure of most tightening devices currently available; in addition, the bag mouth tightening device improves the linkage effect between the bag grabbing claw and the shrinking claw through the cooperation of the main shaft with the first driving mechanism and the second driving mechanism, thereby improving the coordination of the entire device during operation.

[0019] 2. The driven gear drives the support rod to move forward and backward through the cam plate, which can make the bag grabbing claw more stable when opening and closing, and run more smoothly.

[0020] 3. The clamping jaws, connecting pieces, connecting rods, shrinking guide rails and lower fixing plates form a connecting rod mechanism, which can ensure the stability of the shrinking jaws when opening and closing.

[0021] 4. The main shaft cooperates with the shrinking guide rail and the main shaft cooperates with the driving gear respectively, and then controls the opening and closing of the bag grabbing claw and the shrinking claw respectively, which is stable, effective and well coordinated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure from another angle of the present invention.

[0024] Figure 3 for Figure 1 main view.

[0025] Figure 4 It is a schematic diagram of the overall structure of the bag grabbing claw.

[0026] Figure 5 It is a schematic diagram of the overall structure of the shrinking jaws.

[0027] Figure 6 Schematic diagram of the structure of the cam plate.

[0028] Figure 7 It is a schematic diagram of the overall structure of the present invention when the bag grabbing claws are in an open state.

[0029] Figure 8 It is a schematic diagram of the overall structure of the present invention from another angle when the bag grabbing claws are in an open state.

[0030] Fig. 9 for Figure 7 Bottom view of .

[0031] Fig.10 for Fig. 9 A partial enlarged view of point A.

[0032] Fig.11 It is a schematic diagram of the overall structure of the present invention when the shrinking jaws are in a clamping state.

[0033] Fig.12 It is a schematic diagram of the overall structure of the present invention at another angle when the necking jaws are in a clamped state.

[0034] Fig.13 for Fig.11 Bottom view of .

[0035] Fig.14 for Fig.13 A partial enlarged view of point B.

[0036] The reference numerals in the figure represent:

[0037] 1. Base; 11. Upper fixed plate; 12. Lower fixed plate; 13. Column; 14. Bag grabbing groove; 15. Shrinking groove; 2. Transmission assembly; 21. Main shaft; 22. Upper cam; 23. Power gear; 3. Bag grabbing claw; 31. Clamping claw; 32. Support arm; 33. Fixed seat; 34. Support rod; 35. Cam bearing; 36. Linear slider; 37. Linear slide rail; 4. Shrinking claw; 41. Clamping claw; 42. Connecting plate; 43. Connecting rod; 44. Articulated seat; 45. Pressing block; 5. First driving mechanism; 51. Shrinking guide rail; 52. Concave; 53. Connecting arm; 54. Driving wheel; 55. Guide rod; 56. Linear bearing; 6. Second driving mechanism; 61. Driving gear; 62. Driven gear; 63. Cam plate; 64. Slide groove. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See also Figure 1-14 A bag mouth tightening device for fungus bags comprises a base 1, a transmission assembly 2, and a plurality of bag grabbing claws 3 and mouth-shrinking claws 4 uniformly distributed in an annular array on the base 1; the vertical transmission assembly 2 is rotatably fixed to the middle of the base 1; a clamping claw 41 is arranged at the lower end of the mouth-shrinking claw 4, and the clamping claw 41 is rotatably fixed to the base 1; a first driving mechanism 5 is arranged on the transmission assembly 2 to cooperate with the clamping claw 41; the clamping claw 41 can reciprocate along the guidance of the first driving mechanism 5; a clamping claw 31 is arranged at the lower end of the bag grabbing claw 3, and the clamping claw 31 is slidably fixed to the base 1; a second driving mechanism 6 is arranged on the transmission assembly 2 to cooperate with the clamping claw 31; the clamping claw 31 can reciprocate along the guidance of the second driving mechanism 6.

[0040] According to the above description, the bag mouth tightening device mainly includes a base 1, a transmission assembly 2, a bag grabbing claw 3 and a shrinking claw 4. The base 1 is used as a skeleton for installing various components. The transmission assembly 2 is vertically penetrated and rotatably fixed in the middle of the base 1; the transmission assembly 2 is provided with a first driving mechanism 5 and a second driving mechanism 6. The clamping claw 41 of the shrinking claw 4 can reciprocate along the guide of the first driving mechanism 5, thereby realizing the opening and closing of the shrinking claw 4; the clamping claw 31 of the bag grabbing claw 3 can reciprocate along the guide of the second driving mechanism 6, thereby realizing the opening and closing of the bag grabbing claw 3.

[0041] In particular, four groups of bag grabbing claws 3 and mouth-shrinking claws 4 are provided. With the axis of the transmission assembly 2 as the center, the bag grabbing claws 3 are arranged in the east, west, south and north directions, while the mouth-shrinking claws 4 are arranged in the southeast, northeast, southwest and northwest directions.

[0042] Furthermore, the base 1 includes an upper fixing plate 11 and a lower fixing plate 12 which are arranged horizontally in correspondence with each other; a plurality of vertical columns 13 are fixed between the upper fixing plate 11 and the lower fixing plate 12 in a uniform annular array; the clamping claw 31 is slidably fixed on the lower fixing plate 12; the clamping claw 41 is rotatably fixed on the lower fixing plate 12; the transmission assembly 2 includes a vertical main shaft 21 and a power assembly fixed on the upper end of the main shaft 21; the main shaft 21 vertically passes through the middle of the upper fixing plate 11 and the lower fixing plate 12; the power assembly includes an upper cam 22 which is sleeved on the upper end of the main shaft 21 and a power assembly fixed on the upper end of the main shaft 21. The power gear 23 at the lower end of the upper cam 22; the power gear 23 is located above the upper fixed plate 11; the power gear 23 can drive the main shaft 21 to rotate through an external gear; the first driving mechanism 5 is arranged in the middle of the main shaft 21; the second driving mechanism 6 is arranged in the lower part of the main shaft 21; the first driving mechanism 5 is provided with a first cam contour line; the first driving mechanism 5 can drive the clamping jaw 41 to reciprocate along the guide of the first cam contour line; the second driving mechanism 6 is provided with a second cam contour line; the second driving mechanism 6 can drive the clamping jaw 31 to reciprocate along the guide of the second cam contour line.

[0043] According to the above description, the base 1 includes an upper fixed plate 11, a lower fixed plate 12 and a column 13. The transmission assembly 2 includes a main shaft 21, an upper cam 22 and a power gear 23. The clamping claw 31 is slidably fixed on the lower fixed plate 12; the clamping claw 41 is rotatably fixed on the lower fixed plate 12. The first driving mechanism 5 can drive the clamping claw 41 to reciprocate along the guide of the first cam contour line; the second driving mechanism 6 is provided with a second cam contour line; the second driving mechanism 6 can drive the clamping claw 31 to reciprocate along the guide of the second cam contour line. The power gear 23 can drive the main shaft 21 to rotate through an external gear (or rack), thereby driving the first driving mechanism 5 and the second driving mechanism 6 to work, and then through the first cam contour line and the second cam contour line, respectively control the opening and closing of the bag grabbing claw 3 and the shrinking claw 4.

[0044] Furthermore, the bag grabbing claw 3 includes a vertical support arm 32, the clamping claw 31 vertically fixed at the lower end of the support arm 32, and a fixing seat 33 horizontally fixed at the upper end of the support arm 32; the clamping claw 31 is in a fan-shaped column, and the clamping claw 31 is enclosed to form a complete cylindrical structure; a vertical support rod 34 is fixed on one side of the upper end of the fixing seat 33, and a horizontal linear slider 36 is fixed on the other side; a linear slide rail 37 is fixed at the lower end of the lower fixed plate 12; the linear slider 36 is slidably mounted on the linear slide rail 37; a plurality of vertical through bag grabbing grooves 14 are evenly spaced on the lower fixed plate 12; the upper end of the support rod 34 passes through the bag grabbing groove 14 and is connected to the second cam contour guide; the support rod 34 can slide in the bag grabbing groove 14.

[0045] According to the above description, the bag grabbing claw 3 includes a claw 31, a support arm 32, a fixed seat 33, a support rod 34, a linear slider 36 and a linear slide rail 37. The claw 31 is fixed to the lower end of the support arm 32, and all the claws 31 can be closed to form a complete cylindrical structure; the fixed seat 33 is fixed to the upper end of the support arm 32, and the support rod 34 and the linear slider 36 are fixed on both sides of the upper end of the fixed seat 33, respectively. After the support rod 34 penetrates the base 1, it is connected with the second cam contour line guide, and the linear slider 36 is sleeved outside the linear slide rail 37. The support rod 34 cooperates with the second cam contour line to drive the bag grabbing claw 3 (claw 31) to open and close along the linear slide rail 37.

[0046] Furthermore, the shrinking claw 4 includes a vertical L-shaped connecting piece 42, the clamping claw 41 vertically fixed at the lower end of the connecting piece 42, and a connecting rod 43 with one end hinged to the upper end of the connecting piece 42; the other end of the connecting rod 43 is guided and connected to the first driving mechanism 5; a plurality of vertical through shrinking grooves 15 are evenly spaced apart on the lower fixed plate 12; a pressure block 45 is fixed on the lower fixed plate 12 on the side of the shrinking groove 15 close to the main shaft 21; the middle part of the connecting piece 42 passes through the shrinking groove 15, and the end of the short side of the L-shaped connecting piece 42 is hinged to the pressure block 45.

[0047] According to the above description, the shrinking jaw 4 includes a clamping jaw 41, a connecting piece 42 and a connecting rod 43. The clamping jaw 41 is fixed to the lower end of the connecting piece 42, and the connecting rod 43 is hinged to the upper end of the connecting piece 42. The upper end of the connecting rod 43 is connected to the first driving mechanism 5, and the short side end of the connecting piece 42 is hinged to the pressing block 45, so that a connecting rod structure is formed, and the shrinking jaw 4 (clamping jaw 41) can be driven to open and close through the connecting rod 43.

[0048] Furthermore, the first driving mechanism 5 includes an annular shrinking guide rail 51 movably sleeved on the outer side of the middle part of the main shaft 21 and a connecting arm 53 with one end fixed to the middle part of the main shaft 21; a driving wheel 54 is rotatably fixed to the other end of the connecting arm 53; the first cam profile is arranged on the shrinking guide rail 51; the driving wheel 54 cooperates with the first cam profile to drive the shrinking guide rail 51 to move up and down; the upper end of the connecting rod 43 is hinged to the outer side of the shrinking guide rail 51 through a hinge seat 44; a plurality of guide rods 55 are vertically fixed to the upper end of the shrinking guide rail 51; the guide rods 55 pass through the upper fixed plate 11 upward; a linear bearing 56 is also sleeved between the guide rods 55 and the upper fixed plate 11; the main shaft 21 rotates, driving the driving wheel 54 at the end of the connecting arm 53 to move along the first cam profile, the shrinking guide rail 51 moves up and down, and the claw 31 at the lower end of the connecting piece 42 is driven to open and close through the connecting rod 43, thereby controlling the opening and closing of the shrinking claw 4.

[0049] According to the above description, the first driving mechanism 5 includes a shrinking guide rail 51, a connecting arm 53 and a driving wheel 54. The driving wheel 54 is rotatably fixed to the end of the connecting arm 53, and the first cam profile is set on the shrinking guide rail 51; the upper end of the connecting rod 43 is hinged to the outside of the shrinking guide rail 51 through the hinge seat 44. In this way, when the main shaft 21 rotates, the main shaft 21 can drive the driving wheel 54 at the end of the connecting arm 53 to cooperate with the first cam profile, drive the shrinking guide rail 51 to move up and down, and drive the claw 31 at the lower end of the connecting piece 42 to open and close through the connecting rod 43 hinged on the shrinking guide rail 51, thereby controlling the opening and closing of the shrinking claw 4. The guide rod 55 and the linear bearing 56 help to ensure the smooth operation of the shrinking guide rail 51 during the lifting and lowering process of the shrinking guide rail 51.

[0050] Furthermore, the second driving mechanism 6 includes a driving gear 61 coaxially fixed to the lower part of the main shaft 21; a cam plate 63 is rotatably fixed on the upper end of the lower fixed plate 12 corresponding to each of the support rods 34; a driven gear 62 is fixed to the upper end of the cam plate 63; the driven gear 62 is meshed with the driving gear 61; the second cam profile is arranged on the cam plate 63; the upper end of the support rod 34 can reciprocate along the second cam profile; the main shaft 21 rotates, driving the driving gear 61 to rotate, and the driven gear 62 meshing with the driving gear 61 drives the cam plate 63 below to rotate, and the support rod 34 reciprocates along the second cam profile on the cam plate 63, moves back and forth in the bag grabbing groove 14, drives the linear slider 36 to move back and forth on the linear slide rail 37, and finally drives the claw 31 to move back and forth through the support arm 32, thereby controlling the opening and closing of the bag grabbing claw 3.

[0051] According to the above description, the second driving mechanism 6 includes a driving gear 61, a driven gear 62 and a cam plate 63. The driven gear 62 is meshed with the driving gear 61. The driven gear 62 is fixed to the upper end of the cam plate 63, and a second cam profile is provided on the cam plate 63, and the upper end of the support rod 34 can reciprocate along the second cam profile. In this way, when the main shaft 21 rotates, it can drive the driving gear 61 to rotate, and the driven gear 62 meshed with the driving gear 61 drives the cam plate 63 below to rotate, and the support rod 34 reciprocates along the second cam profile on the cam plate 63, moves back and forth in the bag grabbing groove 14, drives the linear slider 36 to move back and forth on the linear slide rail 37, and finally drives the claw 31 to move back and forth through the support arm 32, thereby controlling the opening and closing of the bag grabbing claw 3.

[0052] Furthermore, the first cam contour line is the undulating lower end surface of the shrinking guide rail 51 ; the driving wheel 54 can roll along the undulating lower end surface of the shrinking guide rail 51 .

[0053] Furthermore, an inverted "V"-shaped recess 52 is opened upward at the lower end of the shrinking guide rail 51; the rotation of the main shaft 21 can drive the driving wheel 54 at the end of the connecting arm 53 to roll along the lower end surface of the shrinking guide rail 51; the driving wheel 54 enters the recess 52 from the lower end of the shrinking guide rail 51, and the shrinking guide rail 51 gradually descends due to its own gravity, and the lower end of the connecting rod 43 opens outward, driving the upper end of the connecting piece 42 to open outward and the lower end to retract inward, and the claw 31 at the lower end of the connecting piece 42 retracts inward, so that the shrinking claw 4 is closed; the driving wheel 54 moves from the recess 52 to the lower end of the shrinking guide rail 51, and the driving wheel 54 gradually lifts the shrinking guide rail 51, and the lower end of the connecting rod 43 retracts inward, driving the upper end of the connecting piece 42 to retract inward and the lower end to open outward, and the claw 31 at the lower end of the connecting piece 42 opens outward, so that the shrinking claw 4 is opened.

[0054] Furthermore, the second cam contour is a slide groove 64 provided at the lower end of the cam plate 63 ; the upper end of the support rod 34 can slide back and forth in the slide groove 64 .

[0055] Furthermore, a cam bearing 35 is coaxially rotatably fixed on the upper end of the support rod 34; the cam bearing 35 can slide freely in the slide groove 64. The cam bearing 35 is rotatably fixed on the support rod 34 and sleeved in the slide groove 64. When the cam plate 63 rotates to drive the support rod 34 to move, the cam bearing 35 can roll with the slide groove 64, reducing the wear caused by the direct sliding cooperation between the support rod 34 and the slide groove 64, and improving the service life.

[0056] Working principle of the present invention:

[0057] See also Figure 1-14 When the bag mouth tightening device is used, first, the bag mouth of the bag is transported to the bottom of the bag mouth tightening device. At this time, the bag grabbing claw 3 is in a closed state, and the shrinking claw 4 is in an open state. Then, the external component pushes the bag to lift, and the open bag mouth of the bag is located on the outside of the bag grabbing claw 3 and on the inside of the shrinking claw 4. Then, the external component drives the main shaft 21 to rotate by meshing with the power gear 23. Then, the main shaft 21 rotates, driving the connecting arm 53 and the driving gear 61 to rotate, and the driving gear 61 in turn drives the driven gear 62 to rotate, and then drives the cam plate 63 to rotate. The support rod 34 moves in the bag grabbing groove 14 under the push of the slide groove 64 opened under the cam plate 63, and through the cooperation with the linear slider 36 and the linear slide rail 37, the claw 31 is driven by the support arm 32 to slide along the linear slide rail 37 in the direction away from the main shaft 21, so that the bag grabbing claw 3 is opened, and the outer side surface of the claw 31 presses and opens the inner side surface of the bag mouth of the bag (such as Figure 7-10Then, the main shaft 21 continues to rotate, driving the cam plate 63 to rotate, and the cam plate 63 drives the claw 31 to slide along the linear guide rail 37 toward the main shaft 21 through the support rod 34, so that the bag grabbing claw 3 is gradually tightened; at the same time, during the rotation of the main shaft 21, the driving wheel 54 enters the recess 52 from the lower end of the shrinking guide rail 51, and the shrinking guide rail 51 gradually drops due to its own gravity, so that the lower end of the connecting rod 43 opens outward, driving the upper end of the connecting piece 42 to open outward and the lower end to close inward, and the claw 31 at the lower end of the connecting piece 42 closes inward, so that the shrinking claw 4 is closed, and the lower end of the clamping claw 41 on the shrinking claw 4 enters the gap between the two adjacent clamping claws 31 on the shrinking claw 4, so that the bag mouth is clamped (as shown in FIG. Figure 11-Figure 14 Finally, as the main shaft 21 rotates, the driving wheel 54 moves from the recess 52 to the lower end of the shrinking guide rail 51, so that the shrinking claw 4 opens; the bag grabbing claw 3 also opens under the drive of the cam plate 63, and the whole device is reset to prepare for the tightening of the next bag.

[0058] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bag opening tightening device, characterized in that: The invention comprises a base (1), a transmission assembly (2), and a plurality of bag-grabbing claws (3) and mouth-shrinking claws (4) uniformly distributed in an annular array on the base (1); the vertical transmission assembly (2) is rotatably fixed to the middle of the base (1); a clamping claw (41) is arranged at the lower end of the mouth-shrinking claw (4), and the clamping claw (41) is rotatably fixed to the base (1); a first driving mechanism (5) is arranged on the transmission assembly (2) and is matched with the clamping claw (41); the clamping claw (41) can reciprocate along the guide of the first driving mechanism (5); a clamping claw (31) is arranged at the lower end of the bag-grabbing claw (3), and the clamping claw (31) is slidably fixed to the base (1); a second driving mechanism (6) is arranged on the transmission assembly (2) and is matched with the clamping claw (31); the clamping claw (31) can reciprocate along the guide of the second driving mechanism (6); The base (1) comprises an upper fixing plate (11) and a lower fixing plate (12) which are arranged horizontally in correspondence with each other; a plurality of vertical columns (13) are fixed between the upper fixing plate (11) and the lower fixing plate (12) in a uniform annular array; the clamping claw (31) is slidably fixed on the lower fixing plate (12); the clamping claw (41) is rotatably fixed on the lower fixing plate (12); the transmission assembly (2) comprises a vertical main shaft (21) and a power assembly fixed to the upper end of the main shaft (21); the main shaft (21) vertically passes through the middle of the upper fixing plate (11) and the lower fixing plate (12); the power assembly comprises an upper cam (22) sleeved on the upper end of the main shaft (21) and a cam fixed to the lower fixing plate (12); a power gear (23) at the lower end of the upper cam (22); the power gear (23) is located above the upper fixed plate (11); the power gear (23) can drive the main shaft (21) to rotate through an external gear; the first driving mechanism (5) is arranged at the middle of the main shaft (21); the second driving mechanism (6) is arranged at the lower part of the main shaft (21); the first driving mechanism (5) is provided with a first cam contour line; the first driving mechanism (5) can drive the clamping claw (41) to reciprocate along the guide of the first cam contour line; the second driving mechanism (6) is provided with a second cam contour line; the second driving mechanism (6) can drive the clamping claw (31) to reciprocate along the guide of the second cam contour line; The bag grabbing claw (3) comprises a vertical support arm (32), a clamping claw (31) vertically fixed to the lower end of the support arm (32), and a fixing seat (33) horizontally fixed to the upper end of the support arm (32); the clamping claw (31) is in the shape of a fan-shaped column, and the clamping claws (31) are enclosed to form a complete cylindrical structure; a vertical support rod (34) is fixed on one side of the upper end of the fixing seat (33), and a horizontal linear slide block (36) is fixed on the other side; a linear slide rail (37) is fixed on the lower end of the lower fixing plate (12); the linear slide block (36) is slidably mounted on the linear slide rail (37); a plurality of vertically penetrating bag grabbing grooves (14) are evenly spaced on the lower fixing plate (12); the upper end of the support rod (34) passes through the bag grabbing groove (14) and is connected to the second cam contour line guide; the support rod (34) can slide in the bag grabbing groove (14); the second driving mechanism (6) comprises a coaxially fixed A driving gear (61) is provided at the lower part of the main shaft (21); a cam plate (63) is rotatably fixed on the upper end of the lower fixed plate (12) corresponding to each of the support rods (34); a driven gear (62) is fixed on the upper end of the cam plate (63); the driven gear (62) is meshed with the driving gear (61); the second cam profile is arranged on the cam plate (63); the upper end of the support rod (34) can reciprocate along the second cam profile; the main shaft (21) rotates, driving the driving gear (61) to rotate, the driven gear (62) meshed with the driving gear (61) drives the cam plate (63) below to rotate, the support rod (34) reciprocates along the second cam profile on the cam plate (63), moves forward and backward in the bag grabbing groove (14), drives the linear slider (36) to move forward and backward on the linear slide rail (37), and finally drives the clamping claw (31) to move forward and backward through the support arm (32), thereby controlling the opening and closing of the bag grabbing claw (3); The shrinking claw (4) comprises a vertical L-shaped connecting piece (42), the clamping claw (41) vertically fixed to the lower end of the connecting piece (42), and a connecting rod (43) one end of which is hinged to the upper end of the connecting piece (42); the other end of the connecting rod (43) is connected to the first driving mechanism (5) in a guiding manner; a plurality of vertically penetrating shrinking grooves (15) are evenly spaced on the lower fixed plate (12); a pressure block (45) is fixed on the lower fixed plate (12) at a side of the shrinking groove (15) close to the main shaft (21); the middle part of the connecting piece (42) passes through the shrinking groove (15), and the short side end of the L-shaped connecting piece (42) is hinged to the pressure block (45); the first driving mechanism (5) comprises an annular shrinking guide rail (51) movably sleeved on the outer side of the middle part of the main shaft (21) and a connecting arm (53) one end of which is fixed to the middle part of the main shaft (21); a driving The wheel (54) is rotatably fixed to the other end of the connecting arm (53); the first cam contour is arranged on the shrinking guide rail (51); the driving wheel (54) cooperates with the first cam contour to drive the shrinking guide rail (51) to move up and down; the upper end of the connecting rod (43) is hinged to the outer side of the shrinking guide rail (51) through a hinge seat (44); a plurality of guide rods (55) are vertically fixed to the upper end of the shrinking guide rail (51); the guide rods (55) pass through the upper fixing plate (11) upward; a linear bearing (56) is also sleeved between the guide rods (55) and the upper fixing plate (11); the main shaft (21) rotates to drive the driving wheel (54) at the end of the connecting arm (53) to move along the first cam contour, the shrinking guide rail (51) moves up and down, and the claw (31) at the lower end of the connecting plate (42) is driven to open and close through the connecting rod (43), thereby controlling the opening and closing of the shrinking claw (4).

2. The bag opening tightening device according to claim 1, characterized in that: The first cam contour line is the undulating lower end surface of the shrinking guide rail (51); and the driving wheel (54) is capable of rolling along the undulating lower end surface of the shrinking guide rail (51).

3. The bag opening tightening device according to claim 2, characterized in that: The lower end of the shrinking guide rail (51) is provided with an inverted "V"-shaped recess (52) extending upward. The main shaft (21) rotates to drive the driving wheel (54) at the end of the connecting arm (53) to roll along the lower end surface of the shrinking guide rail (51). The driving wheel (54) enters the recess (52) from the lower end of the shrinking guide rail (51). The shrinking guide rail (51) gradually descends due to its own gravity, and the lower end of the connecting rod (43) opens outward, driving the upper end of the connecting piece (42) to open outward and downward. The lower end of the connecting rod (43) is retracted inwardly, and the claw (31) at the lower end of the connecting piece (42) is retracted inwardly, so that the shrinking claw (4) is closed; the driving wheel (54) moves from the recess (52) to the lower end of the shrinking guide rail (51), and the driving wheel (54) gradually lifts the shrinking guide rail (51), and the lower end of the connecting rod (43) is retracted inwardly, driving the upper end of the connecting piece (42) to retract inwardly and the lower end to open outwardly, and the claw (31) at the lower end of the connecting piece (42) is opened outwardly, so that the shrinking claw (4) is opened.

4. The bag opening tightening device according to claim 1, characterized in that: The second cam contour line is a slide groove (64) provided at the lower end of the cam plate (63); the upper end of the support rod (34) is capable of reciprocatingly sliding in the slide groove (64).

5. The bag opening tightening device according to claim 4, characterized in that: A cam bearing (35) is coaxially rotatably fixed to the upper end of the support rod (34); the cam bearing (35) is able to slide freely in the slide groove (64).

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