Bag clamping mechanism

Abstract

The utility model discloses a bag clamping mechanism which comprises two clamping assemblies which are oppositely arranged, and each clamping assembly comprises a driving piece, a push rod, a first clamping piece, a connecting rod and a second clamping piece. The output end of the driving piece is connected with one end of the push rod, the other end of the push rod penetrates through the first clamping piece and is rotationally connected with one end of the connecting rod, the other end of the connecting rod is rotationally connected with the second clamping piece, and one end of the second clamping piece is rotationally connected with one end of the first clamping piece. The push rod is used for driving the free end of the second clamping piece to be close to or far away from the first clamping piece, and compared with a traditional clamping mechanism needing two clamping jaws to move independently at the same time, the clamping mechanism has the advantages that the first clamping piece is fixed, only the second clamping piece is made to rotate, and the mechanical structure and the operation process are simplified. In the clamping process, the first clamping piece is kept still and serves as a stable supporting point, the second clamping piece is close to or away from the first clamping piece through rotation, it is ensured that a stable datum point exists in the clamping process, and therefore the clamping stability and reliability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging machines, in particular to a bag clamping mechanism. Background Art

[0002] In packaging operations, especially when filling solid powdered or granular products (such as food, medicine, chemical raw materials, etc.), it is usually necessary to use a bag clamping mechanism to firmly clamp the bag to ensure that the material can be accurately filled into the bag. Currently, most common bag clamping mechanisms on the market use mechanical or pneumatic clamping methods, using two opposing clamping arms, each equipped with a pair of rotatable clamping jaws at the end. The bag is clamped by opening and closing the two clamping jaws simultaneously. However, the two independently moving clamping jaws may be unstable due to poor synchronization during the clamping process. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a bag clamping mechanism.

[0004] The technical solution adopted in this utility model is:

[0005] A bag clamping mechanism includes two clamping assemblies arranged opposite to each other, each of the clamping assemblies includes a driving member, a push rod, a first clamping member, a connecting rod and a second clamping member; the output end of the driving member is connected to one end of the push rod, the other end of the push rod is passed through the first clamping member and is rotatably connected to one end of the connecting rod, the other end of the connecting rod is rotatably connected to the second clamping member, one end of the second clamping member is rotatably connected to one end of the first clamping member, and the push rod is used to drive the free end of the second clamping member to move closer to or away from the first clamping member.

[0006] Preferably, a sleeve is provided on the outside of the push rod, the push rod is slidably connected to the inner wall of the sleeve, and one end of the sleeve is connected to the first clamping member.

[0007] Preferably, the first clamping member includes a first connecting portion, a first fixing portion and a first clamping portion, the first connecting portion, the first fixing portion and the first clamping portion are integrally formed, the first connecting portion is rotatably connected to the second clamping member, the first fixing portion is sleeved on the sleeve, a first through hole is opened on the first fixing portion, the first through hole is communicated with the sleeve, and the push rod passes through the first through hole and is rotatably connected to the connecting rod.

[0008] Preferably, the push rod passing through the first through hole and being rotatably connected to the connecting rod includes: a first groove is opened at one end of the push rod passing through the first through hole, a first rotating member is provided in the first groove, and one end of the connecting rod is rotatably connected to the first rotating member.

[0009] Preferably, the second clamping member includes a second connecting portion, a second fixing portion and a second clamping portion, the second connecting portion, the second fixing portion and the second clamping portion are integrally formed, the second connecting portion is rotatably connected to the first connecting portion, a second through hole is provided on the second fixing portion, a second rotating member is provided in the second through hole, and the other end of the connecting rod is rotatably connected to the second rotating member.

[0010] Preferably, the second connecting portion is rotatably connected to the first connecting portion, comprising: a second groove is formed on the first connecting portion, a third rotating member is provided in the second groove, and the second connecting portion is rotatably connected to the third rotating member.

[0011] Preferably, a limiting groove is provided on the side wall of the sleeve, the limiting groove is communicated with the push rod, a limiting member is provided on the push rod, and the limiting member is located in the limiting groove.

[0012] Preferably, a support member is further included, and a fixing member is provided on the sleeve, and the fixing member is connected to the support member.

[0013] The beneficial effects of the present invention are at least one of the following:

[0014] Compared with the traditional clamping mechanism that requires two clamping jaws to move independently and simultaneously, the utility model simplifies the mechanical structure and operation process by fixing the first clamping member and only rotating the second clamping member.

[0015] The first clamping member remains stationary and serves as a stable support point, while the second clamping member moves closer to or away from the first clamping member by rotating. This design ensures a stable reference point during the clamping process, thereby improving the stability and reliability of the clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic top view of the bag clamping mechanism in Example 1 of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of a clamping assembly in Example 1 of the present utility model;

[0018] Figure 3 This is a side structural diagram of the bag clamping mechanism in Example 1 of the present utility model;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the first clamping member in the first embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the second clamping member in the first embodiment of the present utility model;

[0021] Figure 6This is a structural diagram of the limiting groove and the limiting member in the second embodiment of the present utility model.

[0022] Figure numerals: 1. clamping assembly; 10. driving member; 11. push rod; 110. first groove; 111. first rotating member; 12. first clamping member; 120. first connecting portion; 121. first fixing portion; 122. first clamping portion; 123. first through hole; 124. second groove; 125. third rotating member; 13. connecting rod; 14. second clamping member; 140. second connecting portion; 141. second fixing portion; 142. second clamping portion; 143. second through hole; 144. second rotating member; 15. sleeve; 150. limiting groove; 16. limiting member; 17. supporting member; 18. fixing member. DETAILED DESCRIPTION

[0023] In order to make the purpose, scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0025] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout this specification do not necessarily refer to the same embodiment or example. In addition, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a bag clamping mechanism includes two clamping assemblies 1 arranged opposite to each other. Figure 2 As shown, each of the clamping assemblies 1 includes a driving member 10, a push rod 11, a first clamping member 12, a connecting rod 13 and a second clamping member 14; the output end of the driving member 10 is connected to one end of the push rod 11, the other end of the push rod 11 is passed through the first clamping member 12 and is rotatably connected to one end of the connecting rod 13, the other end of the connecting rod 13 is rotatably connected to the second clamping member 14, one end of the second clamping member 14 is rotatably connected to one end of the first clamping member 12, and the push rod 11 is used to drive the free end of the second clamping member 14 to move closer to or away from the first clamping member 12.

[0029] The driving member 10 can be an electric motor that converts the rotational motion of the motor into the linear motion of the push rod 11 through a reduction mechanism (such as a gear reducer or a worm gear reducer). It can also be a pneumatic cylinder or a hydraulic cylinder, which can be selected according to actual needs. In this embodiment, the driving member 10 takes a cylinder as an example, and the piston rod of the cylinder can be fixedly connected to one end of the push rod 11 by means of threads, welding or a pin. Alternatively, a connecting member (such as a connecting plate, flange, etc.) can be added between the cylinder piston rod and the push rod 11, and the connecting member and the two can be fastened together by bolts or screws. This method can provide a more stable connection and allow a certain amount of adjustment space to adapt to different installation and connection requirements.

[0030] Considering the need for synchronized movement of the two clamping assemblies 1, a synchronous control valve (not shown) can be configured when using a pneumatic cylinder as the drive element 10. This valve allows for simultaneous control of the air intake and exhaust ports of both cylinders, ensuring that the pistons of both cylinders move simultaneously. When the synchronous control valve receives a start signal, it simultaneously opens the air intakes of both cylinders, allowing the piston rods of both cylinders to extend or retract simultaneously. Similarly, when it receives a stop signal, it simultaneously closes the air intakes and opens the exhaust ports, causing the piston rods of both cylinders to stop moving simultaneously.

[0031] like Figure 2As shown, a sleeve 15 is provided on the outside of the push rod 11 , the push rod 11 is slidably connected to the inner wall of the sleeve 15 , and one end of the sleeve 15 is connected to the first clamping member 12 .

[0032] For reference, a precision sliding bearing or a lubricant with a low friction coefficient is used between the push rod 11 and the inner wall of the sleeve 15 to reduce friction and wear. One end of the sleeve 15 is firmly connected to the first clamping member 12 by welding, threaded connection or clamping.

[0033] It is understandable that if Figure 3 As shown, a support member 17 is further included, and a fixing member 18 is provided on the sleeve 15, and the fixing member 18 is connected to the support member 17. For reference, one end of the fixing member 18 is fixedly connected to the sleeve 15, and the other end of the fixing member 18 is fixedly connected to the support member 17. The support member 17 can be a mounting plate, a bracket or a frame for fixing the clamping assembly 1.

[0034] like Figure 4 As shown, the first clamping member 12 includes a first connecting portion 120, a first fixing portion 121 and a first clamping portion 122. The first connecting portion 120, the first fixing portion 121 and the first clamping portion 122 are integrally formed. The first connecting portion 120 is rotatably connected to the second clamping member 14. The first fixing portion 121 is sleeved on the sleeve 15. A first through hole 123 is opened on the first fixing portion 121. The first through hole 123 is communicated with the sleeve 15. The push rod 11 passes through the first through hole 123 and is rotatably connected to the connecting rod 13.

[0035] like Figure 4 As shown, the push rod 11 passes through the first through hole 123 and is rotatably connected to the connecting rod 13, including: a first groove 110 is opened at one end of the push rod 11 passing through the first through hole 123, a first rotating member 111 is provided in the first groove 110, and one end of the connecting rod 13 is rotatably connected to the first rotating member 111.

[0036] like Figure 4 As shown, the second clamping member 14 includes a second connecting portion 140, a second fixing portion 141 and a second clamping portion 142. The second connecting portion 140, the second fixing portion 141 and the second clamping portion 142 are integrally formed. The second connecting portion 140 is rotatably connected to the first connecting portion 120. A second through hole 143 is provided on the second fixing portion 141. A second rotating member 144 is provided in the second through hole 143. The other end of the connecting rod 13 is rotatably connected to the second rotating member 144.

[0037] like Figure 4As shown, the second connection part 140 is rotatably connected to the first connection part 120 , including: a second groove 124 is opened on the first connection part 120 , a third rotating member 125 is arranged in the second groove 124 , and the second connection part 140 is rotatably connected to the third rotating member 125 .

[0038] In this embodiment, the bag clamping mechanism is initially in an unclamped state, with the two clamping assemblies 1 positioned relative to each other, and the first clamping member 12 and the second clamping member 14 of each clamping assembly 1 in contact. When a bag needs to be clamped, the cylinder begins operating. The piston rod of the cylinder pushes forward (or pulls backward, depending on the cylinder type), connecting to one end of the push rod 11 via a fixed connection or a connector, driving the push rod 11 to slide within the sleeve 15. During the sliding process, the push rod 11's end, which penetrates the first through hole 123 of the first clamping member 12, is rotatably connected to one end of the connecting rod 13 via the first rotating member 111, and the other end of the rod is rotatably connected to the second clamping member 14 via the second rotating member 144. As the connecting rod 13 swings, the second clamping member 14 rotates around its rotational connection point with the first clamping member 12 (i.e., the connection between the second connecting portion 140 and the first connecting portion 120), so that the free end of the second clamping member 14 gradually moves away from the first clamping member 12, thereby opening the clamping space, and the packaging bag is placed in the clamping space. Then the cylinder works in reverse, the piston rod retracts, and the push rod 11 moves in the opposite direction. The connecting rod 13 swings in the opposite direction, driving the second clamping member 14 to rotate close to the first clamping member 12 until the two tightly clamp the packaging bag.

[0039] Example 2:

[0040] like Figure 4 As shown, a limiting groove 150 is provided on the side wall of the sleeve 15 , and the limiting groove 150 is communicated with the push rod 11 . A limiting member 16 is provided on the push rod 11 , and the limiting member 16 is located in the limiting groove 150 .

[0041] The limiting groove can be defined longitudinally along the sidewall of the sleeve and can be linear, arc-shaped, or other shapes suitable for the sliding motion of the push rod. The length of the limiting groove should be determined based on the maximum sliding stroke of the push rod to ensure that the push rod is effectively restrained by the limiting groove throughout the entire sliding process. The limiting member can be cylindrical, square, or other shapes suitable for sliding within the limiting groove. The limiting member should be securely fixed to the push rod to prevent it from falling off during sliding. Fixing methods can include welding, threading, etc.

[0042] In one possible implementation, a control system can be configured with corresponding stroke control logic in conjunction with a limit slot and a limit member. When the push rod slides to a specific position in the limit slot, a sensor (such as a proximity switch or photoelectric sensor) can detect the position signal of the limit member and, accordingly, control the start and stop of the cylinder or adjust the cylinder's intake / exhaust volume. The sensor is commonly used in the prior art and is not described in detail in this embodiment.

[0043] In this embodiment, when the push rod 11 begins to slide due to an external force, the stopper 16 subsequently slides within the stopper slot 150. Because the stopper slot constrains the stopper, the push rod can only move along the trajectory of the stopper slot, thereby achieving precise control over the direction and range of the push rod's sliding. If the push rod attempts to move beyond the limit slot, the stopper will be blocked by the slot wall, preventing further movement of the push rod.

[0044] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A bag clamping mechanism, characterized in that: The invention comprises two clamping assemblies (1) arranged opposite to each other, wherein the clamping assembly (1) comprises a driving member (10), a push rod (11), a first clamping member (12), a connecting rod (13) and a second clamping member (14); the output end of the driving member (10) is connected to one end of the push rod (11), the other end of the push rod (11) is passed through the first clamping member (12) and is rotatably connected to one end of the connecting rod (13), the other end of the connecting rod (13) is rotatably connected to the second clamping member (14), one end of the second clamping member (14) is rotatably connected to one end of the first clamping member (12), and the push rod (11) is used to drive the free end of the second clamping member (14) to approach or move away from the first clamping member (12).

2. A bag clamping mechanism according to claim 1, characterized in that: A sleeve (15) is provided on the outside of the push rod (11), the push rod (11) is slidably connected to the inner wall of the sleeve (15), and one end of the sleeve (15) is connected to the first clamping member (12).

3. A bag clamping mechanism according to claim 2, characterized in that: The first clamping member (12) includes a first connecting portion (120), a first fixing portion (121) and a first clamping portion (122), wherein the first connecting portion (120), the first fixing portion (121) and the first clamping portion (122) are integrally formed, the first connecting portion (120) is rotatably connected to the second clamping member (14), the first fixing portion (121) is sleeved on the sleeve (15), a first through hole (123) is provided on the first fixing portion (121), the first through hole (123) is communicated with the sleeve (15), and the push rod (11) passes through the first through hole (123) and is rotatably connected to the connecting rod (13).

4. A bag clamping mechanism according to claim 3, characterized in that: The push rod (11) passes through the first through hole (123) and is rotatably connected to the connecting rod (13), comprising: a first groove (110) is provided at one end of the push rod (11) passing through the first through hole (123), a first rotating member (111) is provided in the first groove (110), and one end of the connecting rod (13) is rotatably connected to the first rotating member (111).

5. A bag clamping mechanism according to claim 4, characterized in that: The second clamping member (14) includes a second connecting portion (140), a second fixing portion (141) and a second clamping portion (142); the second connecting portion (140), the second fixing portion (141) and the second clamping portion (142) are integrally formed; the second connecting portion (140) is rotatably connected to the first connecting portion (120); a second through hole (143) is provided on the second fixing portion (141); a second rotating member (144) is provided in the second through hole (143); and the other end of the connecting rod (13) is rotatably connected to the second rotating member (144).

6. A bag clamping mechanism according to claim 5, characterized in that: The second connecting portion (140) is rotatably connected to the first connecting portion (120), comprising: a second groove (124) is provided on the first connecting portion (120), a third rotating member (125) is provided in the second groove (124), and the second connecting portion (140) is rotatably connected to the third rotating member (125).

7. A bag clamping mechanism according to claim 2, characterized in that: A limiting groove (150) is provided on the side wall of the sleeve (15), the limiting groove (150) is communicated with the push rod (11), a limiting member (16) is provided on the push rod (11), and the limiting member (16) is located in the limiting groove (150).

8. The bag clamping mechanism according to claim 2, characterized in that: It also includes a support member (17), a fixing member (18) is provided on the sleeve (15), and the fixing member (18) is connected to the support member (17).

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