Plastic bottle capping machine

Abstract

The invention discloses a plastic bottle capping machine which comprises a first belt conveyor, two second belt conveyors, a bottle cap placing device and a bottle cap tightening device, the two second belt conveyors are symmetrically arranged on the two sides of the first belt conveyor, and the two second belt conveyors are symmetrically arranged on the two sides of the first belt conveyor. A conveying belt of the second belt conveyor is perpendicular to a conveying belt of the first belt conveyor; the bottle cap placing device and the bottle cap tightening device are erected above the first belt conveyor side by side, the bottle cap tightening device comprises a guide seat, a rack, a chain transmission mechanism, a driving mechanism, a transmission part and a plurality of tightening mechanisms, the guide seat is erected above the first belt conveyor, and a guide groove forming a closed loop is formed in the guide seat. Therefore, the retention time of the plastic bottles on an assembly line can be effectively shortened, the production efficiency is improved, more plastic bottles can be capped in unit time, the overall yield is increased, and the production cost of unit products is reduced.

Description

Technical Field

[0001] This application relates to the technical field of plastic bottle caps, and particularly to a plastic bottle capping machine. Background Art

[0002] In the production process of plastic bottles, the capping step is a crucial one. The operating efficiency and quality of the plastic bottle capping machine on the production line directly affect the entire production process.

[0003] With the continuous improvement of the market's requirements for the production efficiency and product quality of plastic bottles, the automation level of plastic bottle capping machines is also constantly increasing. Traditional plastic bottle capping machines use mechanical devices (e.g., mechanical claws) to complete the capping operation. Its working principle is to place the bottle cap on the bottle mouth through the mechanical device, and then fix the bottle cap on the bottle mouth by rotating or pressing, etc.

[0004] However, there are still some problems with the existing plastic bottle capping machines when capping. Specifically, in the actual production process, in order to ensure that the bottle cap can be installed on the bottle mouth, the plastic bottle needs to stay briefly on the production line so that the mechanical device can install the bottle cap (e.g., by rotating or pressing, etc.) on the bottle mouth. This seemingly insignificant stay time actually slows down the overall production rhythm invisibly, resulting in a limited number of plastic bottles that can be produced per unit time, thereby affecting the overall production efficiency. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems in the related technologies to some extent.

[0006] For this reason, one objective of this application is to provide a plastic bottle capping machine, which can effectively reduce the stay time of plastic bottles on the production line, improve the production efficiency, and complete the capping operation of more plastic bottles per unit time. This not only increases the overall output but also reduces the production cost per unit product.

[0007] To achieve the above object, an embodiment of the first aspect of the present application provides a plastic bottle capping machine, which includes a first belt conveyor, two second belt conveyors, a cap placing device, and a cap tightening device. Among them, the two second belt conveyors are symmetrically arranged on both sides of the first belt conveyor, and the conveyor belts of the second belt conveyors are arranged perpendicular to the conveyor belt of the first belt conveyor; the cap placing device and the cap tightening device are arranged side by side above the first belt conveyor. The cap tightening device includes a guide seat, a frame, a chain drive mechanism, a drive mechanism, a transmission member, and a plurality of tightening mechanisms. Among them, the guide seat is arranged above the first belt conveyor, and a closed-loop guide groove is formed on the guide seat; the frame is fixedly arranged on the bottom wall of the guide seat; the chain drive mechanism is arranged on the frame, the drive mechanism is arranged on the frame, and the output end of the drive mechanism is connected to the chain drive mechanism; the transmission member is detachably arranged on the bottom wall of the frame; the plurality of tightening mechanisms are distributed around the frame, and the plurality of tightening mechanisms are respectively connected to the chain drive mechanism, and each tightening mechanism is slidably connected to the guide groove.

[0008] The plastic bottle capping machine according to the embodiment of the present application can effectively reduce the residence time of plastic bottles on the production line, improve production efficiency, and complete more capping operations of plastic bottles per unit time, which not only increases the overall output but also reduces the production cost per unit product.

[0009] In addition, the plastic bottle capping machine proposed above according to the present application may further have the following additional technical features: In an embodiment of the present application, the cap placing device includes a guide cylinder, two first limiting mechanisms, a spring, and a second limiting mechanism. Among them, the guide cylinder is obliquely arranged above the first belt conveyor, and the outlet end of the guide cylinder is close to the cap tightening device; the two first limiting mechanisms are respectively arranged on both sides of the guide cylinder, and one end of the first limiting mechanism is pivotally connected to the side wall of the guide cylinder, and the other end of the first limiting mechanism extends to the outlet of the guide cylinder; both ends of the spring are respectively connected to the two first limiting mechanisms; the second limiting mechanism is pivotally connected to the top wall of the guide cylinder.

[0010] In an embodiment of the present application, the first limiting mechanism includes a support arm and a clamping plate. Among them, one end of the support arm is pivotally connected to the side wall of the guide cylinder, the other end of the support arm extends to the outlet of the guide cylinder, and the support arm is fixedly connected to the end of the spring through a connecting rod; one end of the clamping plate is fixedly connected to the other end of the support arm, the other end of the clamping plate extends to the inside of the outlet of the guide cylinder, and the clamping plate is wavy.

[0011] In an embodiment of the present application, the second limiting mechanism includes a pressing plate, a U-shaped frame, a guide rod, a baffle plate, and a tension spring. Wherein, one end of the pressing plate is pivotally connected to the top wall of the guiding cylinder, the other end of the pressing plate extends below the corresponding tightening mechanism, and an upper cover opening is formed on the pressing plate; the U-shaped frame is close to the outlet end of the guiding cylinder and is fixedly arranged on the top wall of the guiding cylinder; one end of the guide rod is pivotally connected to the pressing plate, the other end of the guide rod penetrates through the U-shaped frame and is fixedly connected to the baffle plate; the tension spring is sleeved on the guide rod, and one end of the tension spring is fixedly connected to the pressing plate, and the other end of the tension spring is fixedly connected to the U-shaped frame.

[0012] In an embodiment of the present application, the transmission member is an external gear ring.

[0013] In an embodiment of the present application, the tightening mechanism includes a support seat, a spline sleeve, a gear, a spline shaft, an upper cover plate, a connecting seat, and a roller. Wherein, the support seat is slidably arranged on the frame, and the support seat is connected to the chain transmission mechanism; the spline sleeve is rotatably arranged on the support seat, and the spline sleeve penetrates through the support seat; the gear is sleeved and fixed on the spline sleeve, and the gear meshes with the transmission member; one end of the spline shaft penetrates through the spline sleeve and is fixedly connected to the upper cover plate, the other end of the spline shaft is rotatably connected to the connecting seat, wherein the diameter of the upper cover plate is smaller than the diameter of the upper cover opening; the roller is slidably arranged in the guiding groove, and the support shaft of the roller is fixedly connected to the connecting seat.

[0014] Compared with the prior art, the beneficial effects of the present application are: it can effectively reduce the residence time of plastic bottles on the production line, improve production efficiency, and complete more plastic bottle capping operations per unit time, which not only increases the overall output but also reduces the production cost per unit product.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein: Figure 1 is the front view of a plastic bottle capping machine according to an embodiment of the present application; Figure 2 is the three-dimensional view of a plastic bottle capping machine according to an embodiment of the present application; Figure 3 is the partial structural schematic diagram of a plastic bottle capping machine according to an embodiment of the present application; Figure 4 Schematic structural diagram of a bottle cap tightening device according to an embodiment of the present application; Figure 5 Schematic structural diagram of a bottle cap placing device according to an embodiment of the present application.

[0017] As shown in the figure: 10, the first belt conveyor; 20, the second belt conveyor; 30, the bottle cap placing device; 31, the guide cylinder; 32, the first limiting mechanism; 321, the support arm; 322, the clamping plate; 33, the spring; 34, the second limiting mechanism; 341, the pressing plate; 342, the U-shaped frame; 343, the guide rod; 344, the baffle; 345, the tension spring; 301, the upper cover opening; 40, the bottle cap tightening device; 41, the guide seat; 42, the frame; 43, the chain drive mechanism; 44, the drive mechanism; 45, the transmission member; 46, the tightening mechanism; 461, the support seat; 462, the spline sleeve; 463, the gear; 464, the spline shaft; 465, the upper cover plate; 466, the connecting seat; 467, the roller; 401, the guide groove. Detailed implementation manners

[0018] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as a limitation to the present application.

[0019] The plastic bottle capping machine according to the embodiments of the present application will be described below with reference to the drawings.

[0020] The plastic bottle capping machine provided by the embodiments of the present application can be applied not only to capping plastic bottles but also to capping glass bottles, metal bottles, etc.

[0021] As Figures 1 - 5 shown, the plastic bottle capping machine according to the embodiments of the present application may include a first belt conveyor 10, two second belt conveyors 20, a bottle cap placing device 30, and a bottle cap tightening device 40.

[0022] Among them, the two second belt conveyors 20 are symmetrically arranged on both sides of the first belt conveyor 10, and the conveyor belts of the second belt conveyors 20 are arranged perpendicular to the conveyor belt of the first belt conveyor 10.

[0023] It should be noted that the first belt conveyor 10 and the second belt conveyor 20 described in this embodiment are both composed of a plurality of conveyor rollers (not shown in the figure), a conveyor belt (not specifically marked in the figure), and a driving motor (not shown in the figure). It should be particularly noted that the conveyor belts of the two second belt conveyors 20 enclose a conveying channel for conveying plastic bottles, and the inlet and outlet ends of the conveying channel both expand outward (that is, the width of the waist of the conveying channel is smaller than the width of the two end ports of the conveying channel, and the two end ports are funnel-shaped). It can be understood that such a design facilitates the entry of plastic bottles from the inlet end of the conveying channel and the output from the outlet end. At the same time, the waist of the conveying channel can also form a clamping force on the plastic bottles to prevent the plastic bottles from shaking during capping (for example, for plastic bottles that need to tighten the bottle caps, when tightening the bottle caps, the plastic bottles rotate, which affects the tightening effect). The cap placing device 30 and the cap tightening device 40 are arranged side by side above the first belt conveyor 10. The cap tightening device 40 may include a guide seat 41, a frame 42, a chain drive mechanism 43, a drive mechanism 44, a transmission member 45, and a plurality of tightening mechanisms 46.

[0024] Among them, the guide seat 41 is arranged above the first belt conveyor 10, and a closed-loop guide groove 401 is formed on the guide seat 41. It should be noted that the guide groove 401 described in this example is opened around the guide seat 41, and the height of the guide groove 401 located at the waist of the guide seat 41 is lower than the height of the guide groove 401 located at both ends of the guide seat 41, that is, the guide groove 401 is a closed loop with undulations. The undulating change of the guide groove 401 from one end to the other end of the guide seat 41 is in the state of high-low-high-low-high.

[0025] The frame 42 is fixedly arranged on the bottom wall of the guide seat 41. The chain drive mechanism 43 is arranged on the frame 42. The drive mechanism 44 is arranged on the frame 42, and the output end of the drive mechanism 44 is connected to the chain drive mechanism 43. It should be noted that the drive mechanism 44 described in this embodiment may be a servo motor.

[0026] It should be noted that the chain drive mechanism 43 described in this embodiment is composed of two sprockets (not shown in the figure), a chain (not specifically marked in the figure), and a driving motor (not shown in the figure), that is, the staff controls the drive mechanism 44 to drive the sprockets to drive the chain to move in a circular motion on the frame 42. The chain in circular motion drives a plurality of tightening mechanisms 46 to perform synchronous motion around the frame 42.

[0027] The transmission member 45 is detachably arranged on the bottom wall of the frame 42. Among them, the transmission member 45 may be an external gear ring.

[0028] It can be understood that the transmission member 45 described in this embodiment is detachably arranged on the bottom wall of the frame 42, which is convenient for the installation and replacement of the transmission member 45. For example, the transmission member 45 can be connected to the frame 42 by means of snap connection, threaded fasteners (screws, bolts or nuts), etc.

[0029] A plurality of tightening mechanisms 46 are distributed around the frame 42, and the plurality of tightening mechanisms 46 are respectively connected to the chain transmission mechanism 43. For example, the plurality of tightening mechanisms 46 can be 2, 4, 6, 8, 10 tightening mechanisms 46, etc. The specific number can be selected according to the actual situation (for example, the number of the tightening mechanisms 46 is 4), which is not limited here. Each tightening mechanism 46 is slidably connected to the guide groove 401.

[0030] It should be particularly noted that the moving speed of the conveyor belt in the first belt conveyor 10 and the two second belt conveyors 20 described in this embodiment is the same as the moving speed of the chain in the chain transmission mechanism 43.

[0031] Specifically, when it is necessary to cap plastic bottles filled with objects (liquids, semi-solids or solids), relevant staff can first convey the bottle caps to the cap placing device 30 one by one. When the plastic bottles filled with objects are conveyed to the first belt conveyor 10 through the conveyor belt, with the movement of the first belt conveyor 10, the plastic bottles pass between the two second belt conveyors 20, and the conveyor belts in the two second belt conveyors 20 generate a certain clamping force on the plastic bottles (the clamping force is not sufficient to squeeze out the objects in the plastic bottles). When the plastic bottles pass under the cap placing device 30, the cap placing device 30 places the bottle caps on the bottle mouths of the plastic bottles.

[0032] At the same time, the staff controls the driving mechanism 44 to drive the chain transmission mechanism 43 to drive the plurality of tightening mechanisms 46 to perform circular motion around the frame 42, and makes the moving plastic bottles move synchronously with the corresponding tightening mechanisms 46 (the synchronous movement can be obtained by the staff's debugging. For example, the staff can adjust the distance between any two adjacent plastic bottles to be capped to be the same as the distance between any two adjacent tightening mechanisms 46). At the same time, during the movement of the tightening mechanism 46, the tightening mechanism 46 is driven by the transmission member 45 to rotate self.

[0033] When the tightening mechanism 46 moves along the guide groove 401, when the tightening mechanism 46 moves from the high place to the low place of the guide groove 401, the rotating tightening mechanism 46 gradually moves down and screws the bottle cap tightly on the plastic bottle.

[0034] As the tightening mechanism 46 continues to move, the tightening mechanism 46 moves from the lower part to the upper part of the guiding groove 401. At this time, the tightening mechanism 46 gradually moves upward and away from the bottle cap of the plastic bottle to cap the next plastic bottle. With this capping method, there is no need for the plastic bottle to stay for capping, which can effectively reduce the residence time of the plastic bottle on the production line, improve production efficiency, and complete more capping operations of plastic bottles per unit time. This not only increases the overall output but also reduces the production cost per unit product.

[0035] Optionally, since there is no screw connection (i.e., no need to tighten) when capping some plastic bottles, the bottle cap can be tightened on the plastic bottle just by pressing. According to this situation, the staff can pre-dismantle the transmission member 45 from the frame 42. At this time, when the tightening mechanism 46 moves along the guiding groove 401, it only moves up and down to press the bottle cap against the mouth of the plastic bottle.

[0036] In an embodiment of the present application, as Figures 1 - 3 and Figure 5 shown, the bottle cap placing device 30 may include a guiding cylinder 31, two first limiting mechanisms 32, a spring 33, and a second limiting mechanism 34.

[0037] In the example of the present application, the inlet end of the guiding cylinder 31 may be connected to a cap feeder (not shown in the figure) through a cap feeding channel (not shown in the figure). Among them, the cap feeding channel may be surrounded by multiple metal bars.

[0038] Among them, the guiding cylinder 31 is inclined and installed above the first belt conveyor 10. The inclination angle of the guiding cylinder 31 can be set according to the actual situation and is not limited herein (it is appropriate that the plastic bottle can take away the bottle cap located in the guiding cylinder 31 when passing through the guiding cylinder 31). And the outlet end of the guiding cylinder 31 is close to the bottle cap tightening device 40. It should be noted that the height of the outlet end of the guiding cylinder 31 described in this embodiment is lower than the height of its inlet end.

[0039] It should be noted that a lower cap opening (not specifically marked in the figure) is provided at the bottom wall of the outlet end of the guiding cylinder 31 described in this embodiment. When the plastic bottle passes through the guiding cylinder 31, the mouth of the plastic bottle extends into this lower cap opening (see Figure 5 shown) and takes the bottle cap out of the guiding cylinder 31.

[0040] The two first limiting mechanisms 32 are respectively arranged on both sides of the guiding cylinder 31, and one end of the first limiting mechanism 32 is pivotally connected to the side wall of the guiding cylinder 31, and the other end of the first limiting mechanism 32 extends to the outlet of the guiding cylinder 31.

[0041] Both ends of the spring 33 are respectively connected to the two first limiting mechanisms 32, and the second limiting mechanism 34 is pivotally connected to the top wall of the guiding cylinder 31.

[0042] For clearly illustrating the previous embodiment, in one embodiment of the present application, as Figure 5 shown, the first limiting mechanism 32 may include a support arm 321 and a clamping plate 322. Among them, one end of the support arm 321 is pivotally connected to the side wall of the guiding cylinder 31, the other end of the support arm 321 extends to the outlet of the guiding cylinder 31, and the support arm 321 is fixedly connected to the end of the spring 33 through a connecting rod.

[0043] One end of the clamping plate 322 is fixedly connected to the other end of the support arm 321, the other end of the clamping plate 322 extends to the inner side of the outlet of the guiding cylinder 31, and the clamping plate 322 is wavy.

[0044] Furthermore, in one embodiment of the present application, as Figure 5 shown, the second limiting mechanism 34 may include a pressing plate 341, a U-shaped frame 342, a guide rod 343, a baffle plate 344 and a tension spring 345.

[0045] Among them, one end of the pressing plate 341 is pivotally connected to the top wall of the guiding cylinder 31, the other end of the pressing plate 341 extends to the lower part of the corresponding tightening mechanism 46, and an upper cover opening 301 is formed on the pressing plate 341.

[0046] The U-shaped frame 342 is close to the outlet end of the guiding cylinder 31 and is fixedly arranged on the top wall of the guiding cylinder 31. One end of the guide rod 343 is pivotally connected to the pressing plate 341, and the other end of the guide rod 343 penetrates through the U-shaped frame 342 and is fixedly connected to the baffle plate 344. It should be noted that one end of the guide rod 343 described in this embodiment can be pivotally connected to the pressing plate 341 through a pin shaft.

[0047] The tension spring 345 is sleeved on the guide rod 343, and one end of the tension spring 345 is fixedly connected to the pressing plate 341, and the other end of the tension spring 345 is fixedly connected to the U-shaped frame 342.

[0048] Specifically, when the bottle cap is fed into the guiding cylinder 31, the two clamping plates 322 clamp and limit the bottle cap close to the outlet end of the guiding cylinder 31.

[0049] When the plastic bottle containing an object passes through the guiding cylinder 31 and the bottle mouth of the plastic bottle extends into the lower cover opening of the guiding cylinder 31. As the plastic bottle moves, the bottle mouth of the plastic bottle abuts against the inner wall of the bottle cap and applies a thrust to the bottle cap. At this time, the two clamping plates 322 are forced to expand outward and drive the corresponding support arms 321 to rotate, and the two support arms 321 rotating outward stretch the spring 33.

[0050] As the plastic bottle continues to move, the plastic bottle pushes the bottle cap out of the guiding cylinder 31. When the bottle cap moves out of the guiding cylinder 31, the pressing plate 341 presses the bottle cap on the bottle mouth of the plastic bottle under the action of the tension of the tension spring 345, thus completing the automatic placement of the bottle cap.

[0051] Further, in an embodiment of the present application, as Figures 1 - 4 shown, the tightening mechanism 46 may include a support base 461, a spline sleeve 462, a gear 463, a spline shaft 464, an upper cover plate 465, a connecting seat 466, and a roller 467.

[0052] Among them, the support base 461 is slidably arranged on the frame 42, and the support base 461 is connected to the chain drive mechanism 43. It should be noted that the support base 461 described in this embodiment can be connected to the chain of the chain drive mechanism 43 through threaded fasteners.

[0053] The spline sleeve 462 is rotatably arranged on the support base 461, and the spline sleeve 462 penetrates through the support base 461. The gear 463 is sleeved and fixed on the spline sleeve 462, and the gear 463 meshes with the transmission member 45.

[0054] One end of the spline shaft 464 penetrates through the spline sleeve 462 and is fixedly connected to the upper cover plate 465, and the other end of the spline shaft 464 is rotatably connected to the connecting seat 466. Among them, the diameter of the upper cover plate 465 is smaller than the diameter of the upper cover opening 301.

[0055] The roller 467 is slidably arranged in the guide groove 401, and the support shaft of the roller 467 is fixedly connected to the connecting seat 466.

[0056] It can be understood that when the drive mechanism 44 drives the chain drive mechanism 43 to move, the chain in the chain drive mechanism 43 drives the spline sleeve 462, the gear 463, the spline shaft 464, the upper cover plate 465, the connecting seat 466, and the roller 467 to move synchronously through the support base 461, and the moving roller 467 slides along the guide groove 401. Since the gear 463 meshes with the fixedly arranged transmission member 45 (external gear ring), when the gear 463 moves, the gear 463 is driven to rotate, and the rotating gear 463 drives the spline shaft 464 to rotate through the spline sleeve 462, and the rotating spline shaft 464 drives the upper cover plate 465 to rotate synchronously.

[0057] When the roller 467 moves from the high position to the low position of the guide groove 401, the roller 467 drives the rotating spline shaft 464 to move downward through the connecting seat 466, and the downward moving spline shaft 464 drives the upper cover plate 465 to move downward along the inner hole of the spline sleeve 462. Furthermore, the upper cover plate 465 moves downward during rotation and screws the bottle cap onto the mouth of the plastic bottle.

[0058] When the roller 467 moves from the low position to the high position of the guide groove 401, the upper cover plate 465 moves away from the bottle cap of the plastic bottle.

[0059] Optionally, in order to increase the friction when the upper cover plate 465 contacts the bottle cap, a leather pad with anti-slip patterns can also be provided on the bottom wall of the upper cover plate 465.

[0060] In summary, the plastic bottle capping machine according to the embodiment of the present application can effectively reduce the residence time of plastic bottles on the production line, improve production efficiency, and complete more capping operations of plastic bottles per unit time. This not only increases the overall output but also reduces the production cost per unit product.

[0061] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A plastic bottle capping machine, characterized in that: It includes a first belt conveyor, two second belt conveyors, a bottle cap placing device and a bottle cap tightening device, wherein: The two second belt conveyors are symmetrically arranged on both sides of the first belt conveyor, and the conveyor belts of the second belt conveyors are arranged perpendicular to the conveyor belt of the first belt conveyor; The bottle cap placing device and the bottle cap tightening device are arranged side by side above the first belt conveyor, and the bottle cap tightening device comprises a guide seat, a frame, a chain transmission mechanism, a driving mechanism, a transmission member and a plurality of tightening mechanisms, wherein: The guide seat is mounted above the first belt conveyor, and a guide groove forming a closed loop is provided on the guide seat; The frame is fixedly arranged on the bottom wall of the guide seat; The chain transmission mechanism is arranged on the frame, The driving mechanism is arranged on the frame, and the output end of the driving mechanism is connected to the chain transmission mechanism; The transmission member is detachably arranged on the bottom wall of the frame; A plurality of tightening mechanisms are distributed around the frame, and the plurality of tightening mechanisms are respectively connected to the chain transmission mechanism, and each of the tightening mechanisms is slidably connected to the guide groove.

2. The plastic bottle capping machine according to claim 1, characterized in that: The bottle cap placement device comprises a guide cylinder, two first limiting mechanisms, a spring and a second limiting mechanism, wherein: The guide cylinder is tiltedly mounted above the first belt conveyor, and the outlet end of the guide cylinder is close to the bottle cap tightening device; The two first limiting mechanisms are respectively arranged on both sides of the guide cylinder, and one end of the first limiting mechanism is pivotally connected to the side wall of the guide cylinder, and the other end of the first limiting mechanism extends to the exit of the guide cylinder; The two ends of the spring are respectively connected to the two first limiting mechanisms; The second limiting mechanism is pivotally connected to the top wall of the guide cylinder.

3. The plastic bottle capping machine according to claim 2, characterized in that: The first limiting mechanism includes a support arm and a clamping plate, wherein: One end of the support arm is pivotally connected to the side wall of the guide cylinder, the other end of the support arm extends to the outlet of the guide cylinder, and the support arm is fixedly connected to the end of the spring through a connecting rod; One end of the clamping plate is fixedly connected to the other end of the support arm, the other end of the clamping plate extends to the inner side of the outlet of the guide cylinder, and the clamping plate is wavy.

4. The plastic bottle capping machine according to claim 2, characterized in that: The second limiting mechanism includes a pressure plate, a U-shaped frame, a guide rod, a baffle and a tension spring, wherein: One end of the pressing plate is pivotally connected to the top wall of the guide cylinder, the other end of the pressing plate extends to the bottom of the corresponding tightening mechanism, and an upper cover opening is opened on the pressing plate; The U-shaped frame is close to the outlet end of the guide cylinder and is fixedly arranged on the top wall of the guide cylinder; One end of the guide rod is pivotally connected to the pressure plate, and the other end of the guide rod passes through the U-shaped frame and is fixedly connected to the baffle; The tension spring is sleeved on the guide rod, one end of the tension spring is fixedly connected to the pressure plate, and the other end of the tension spring is fixedly connected to the U-shaped frame.

5. The plastic bottle capping machine according to claim 1, characterized in that: The transmission member is an outer gear ring.

6. The plastic bottle capping machine according to claim 4 or 5, characterized in that: The tightening mechanism includes a support seat, a spline sleeve, a gear, a spline shaft, an upper cover plate, a connecting seat and a roller, wherein: The support seat is slidably arranged on the frame, and the support seat is connected to the chain transmission mechanism; The spline sleeve is rotatably arranged on the support seat, and the spline sleeve passes through the support seat; The gear is sleeved and fixed on the spline sleeve, and the gear is meshed with the transmission member; One end of the spline shaft passes through the spline sleeve and is fixedly connected to the upper cover plate, and the other end of the spline shaft is rotatably connected to the connecting seat, wherein the diameter of the upper cover plate is smaller than the diameter of the upper cover opening; The roller is slidably arranged in the guide groove, and the supporting shaft of the roller is fixedly connected to the connecting seat.

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