Mixing equipment for ointment production

Abstract

The utility model relates to mixing equipment for ointment production, and relates to the technical field of ointment production equipment, in order to solve the problem that ointment is easily attached to the inner wall of the equipment, the mixing equipment comprises a rack, a mixing barrel is arranged on the rack, a feeding mechanism and a stirring mechanism are arranged on the mixing barrel, the feeding mechanism is arranged at an opening of the mixing barrel, and the stirring mechanism is arranged at the opening of the mixing barrel. The stirring mechanism comprises a stirring motor, a stirring rod, a plurality of connecting rods and a plurality of paste scraping plates, the stirring motor is arranged at the bottom of the mixing barrel, the stirring rod is rotationally arranged in the mixing barrel and connected to the output end of the stirring motor, the connecting rods are sequentially arranged in the length direction of the stirring rod, and the paste scraping plates are arranged on the connecting rods. The plurality of paste scraping plates are in one-to-one correspondence with the plurality of connecting rods, the paste scraping plates are connected to the end parts of the connecting rods, and the paste scraping plates are propped against the inner wall of the mixing barrel. The device has the effects of reducing ointment residues on the inner wall and reducing the cleaning difficulty.

Description

Technical Field

[0001] This application relates to the technical field of ointment production equipment, and in particular to a mixing device for ointment production. Background Art

[0002] As a common external medicine, the quality of ointment is directly related to the treatment effect and medication safety of patients. Ointment usually consists of various raw materials such as active ingredients, base oil, emulsifier, stabilizer, etc. These raw materials need to achieve a certain degree of uniformity and stability during the mixing process to ensure the quality and efficacy of the ointment. The production process of ointment includes multiple steps such as raw material preparation, mixing, emulsification, heating, cooling, inspection, and packaging. Among them, the mixing step is a key link in ointment production. Through the mixing device, various raw materials can be fully mixed, so that the active ingredients in the ointment are evenly distributed, thus achieving the expected treatment effect.

[0003] In the related art, during the mixing process of ointment, due to the viscous characteristics of the ointment, the ointment is likely to adhere to the inner wall of the equipment during the stirring process. This not only reduces the actual effective amount of ointment used in production, increases the production cost, but also increases the difficulty of equipment cleaning. Incomplete cleaning may cause residual ointment inside the equipment, which in turn affects the quality of the products produced in the next production. Therefore, it needs to be improved. Utility Model Content

[0004] In order to solve the problem that the ointment is easy to adhere to the inner wall of the equipment, this application provides a mixing device for ointment production.

[0005] The mixing device for ointment production provided by this application adopts the following technical solution:

[0006] A mixing device for ointment production includes a frame. A mixing cylinder is arranged on the frame. A feeding mechanism and a stirring mechanism are arranged on the mixing cylinder. The feeding mechanism is arranged at the opening of the mixing cylinder. The stirring mechanism includes a stirring motor, a stirring rod, a plurality of connecting rods, and a plurality of scraping plates. The stirring motor is arranged at the bottom of the mixing cylinder. The stirring rod is rotatably arranged in the mixing cylinder. The stirring rod is connected to the output end of the stirring motor. A plurality of the connecting rods are arranged in sequence along the length direction of the stirring rod. A plurality of the scraping plates correspond to the plurality of the connecting rods one by one. The scraping plates are connected to the ends of the connecting rods. The scraping plates abut against the inner wall of the mixing cylinder.

[0007] Due to the adhesive properties of the ointment, the ointment is prone to adhering to the inner wall of the equipment during the stirring process. This not only reduces the actual amount of effective ointment used in production, increases production costs, but also increases the difficulty of equipment cleaning. Incomplete cleaning may lead to residual ointment inside the equipment, which in turn affects the quality of the products in the next production. By adopting the above technical solution, including a frame, a mixing cylinder is installed on the frame, a feeding mechanism and a stirring mechanism are installed in the mixing cylinder. The stirring mechanism includes a stirring motor, a stirring rod, several connecting rods and several scraping plates. When mixing and stirring the ointment, the ointment raw materials are accurately put into the mixing cylinder through the feeding mechanism, and the stirring motor starts to operate, driving the stirring rod to slowly rotate inside the mixing cylinder. As the stirring rod rotates, the connecting rods and scraping plates connected to it also move synchronously. The scraping plates cleverly fit the inner wall of the mixing cylinder, ensuring that during the stirring process, the ointment can be evenly stirred, while preventing the ointment from adhering to the cylinder wall. As the stirring rod rotates, the scraping plates continuously scrape the ointment adhering to the cylinder wall, making it re-participate in the stirring process, forming a complex and orderly flow pattern, and achieving rapid and uniform mixing. Through the settings of the stirring motor, the stirring rod, several connecting rods and several scraping plates, etc., the scraping plates can continuously scrape the ointment adhering to the cylinder wall, effectively reducing the waste of the ointment, improving production efficiency, reducing production costs, ensuring the uniform stirring of the ointment, guaranteeing the quality and uniformity of the ointment, and at the same time making the cleaning work of the equipment simple and fast, reducing the residual ointment on the inner wall, reducing the cleaning difficulty, and further ensuring the quality of the products in the next production.

[0008] Optionally, an elastic protective sleeve for preventing scratching is provided at the abutting end of the scraping plate, and a notch for embedding the scraping plate is provided on the elastic protective sleeve.

[0009] By adopting the above technical solution, the elastic protective sleeve is installed on the scraping plate through the notch. Through the setting of the elastic protective sleeve, it can reduce the scratching caused by the direct contact between the scraping plate and the inner wall of the mixing cylinder when scraping the ointment, not only protecting the smoothness and durability of the inner wall of the mixing cylinder, but also ensuring that the scraping plate itself will not be damaged due to long-term friction with the hard inner wall, and extending its service life.

[0010] Optionally, a number of scraping teeth are provided on the elastic protective sleeve, and the number of the scraping teeth are sequentially arranged at the abutting end of the elastic protective sleeve.

[0011] By adopting the above technical solution, a number of scraping teeth are integrally formed on the elastic protective sleeve. Through the setting of the number of scraping teeth, the contact area of the elastic protective sleeve is increased, and it can more effectively scrape the ointment adhering to the cylinder wall. The scraping teeth can penetrate into the adhering layer of the ointment to ensure that the ointment is completely scraped off and avoid residue.

[0012] Optionally, a lifting mechanism is provided on the frame, and the lifting mechanism includes a lifting cylinder and a lifting seat. The lifting cylinder is connected to the frame, the lifting cylinder is arranged below the mixing barrel, the lifting seat is connected to the output end of the lifting cylinder, and the stirring motor is connected to the lifting seat.

[0013] By adopting the above technical scheme, the lifting mechanism is installed on the frame, and the lifting mechanism includes a lifting cylinder and a lifting seat; in the mixing equipment for ointment production, the lifting cylinder is in a retracted state, the lifting seat is in the lowest position, the stirring motor starts to run, and drives the stirring rod to rotate slowly inside the mixing barrel. As the stirring rod rotates, the connecting rod and the scraper plate also move synchronously, and the scraper plate continuously scrapes off the ointment attached to it along the wall of the mixing barrel, so that it re-participates in the stirring process to achieve uniform mixing of the ointment. After stirring for a certain period of time, the lifting cylinder begins to extend, pushing the lifting seat and the stirring motor, stirring rod, connecting rod and scraper plate thereon to move upward as a whole. In this process, the scraper plate always sticks to the inner wall of the mixing barrel and continues to scrape off the residual ointment during the movement. When the lifting seat rises to a certain height, the lifting cylinder begins to contract, driving the lifting seat and the components thereon Move downward. During this process, the scraper plate scrapes off any remaining ointment along the wall of the mixing barrel again to ensure the cleanliness of the barrel wall. The extension and contraction of the lifting cylinder can form a reciprocating cycle. According to the characteristics of the ointment and the need for stirring, the appropriate number and frequency of reciprocations can be set. Through the reciprocating motion of the lifting mechanism, the scraper plate can more comprehensively scrape off the ointment on the inner wall of the mixing barrel to ensure the mixing effect while reducing residue. When the ointment reaches the predetermined mixing effect, the stirring motor stops running and the lifting cylinder remains in a suitable position, waiting for the next feeding and stirring operation; through the setting of the lifting cylinder and the lifting seat, it is ensured that the scraper plate can effectively remove the ointment residue at all heights of the mixing barrel, thereby improving the scraping effect. At the same time, the ointment attached to the barrel wall is also brought back into the stirring process, making the ointment mixing more even, which helps to improve the mixing effect and product quality of the ointment.

[0014] Optionally, a guide rod is vertically arranged at the bottom of the mixing cylinder, and the lifting seat is slidably connected to the guide rod.

[0015] By adopting the above technical solution, the guide rod is installed at the bottom of the mixing barrel, and the lifting seat slides on the guide rod; through the setting of the guide rod, the guide rod provides a stable motion trajectory for the lifting seat, ensuring that the lifting seat can slide up and down along the guide rod smoothly and accurately under the drive of the lifting cylinder, reducing the possibility of shaking or deviation of the lifting seat during movement, and ensuring the stable operation of components such as the stirring motor, stirring rod, connecting rod and scraper plate.

[0016] Optionally, a support is provided on the frame, the mixing cylinder is connected to the support, and a plurality of ribs for improving the structural strength are provided on the support.

[0017] By adopting the above technical solution, the support is installed on the frame, and the rib plate is welded and fixed on the support; through the arrangement of the support and the rib plate, the support provides stable support for the mixing cylinder, ensuring that the mixing cylinder does not move or vibrate during the stirring process. At the same time, the rib plate effectively enhances the bearing capacity and rigidity of the support and the stability of the overall structure.

[0018] Optionally, the feeding mechanism is arranged on the support. The feeding mechanism includes a feeding hopper and a vibrating motor. The feeding hopper is connected to the support, the feeding hopper is arranged facing the opening direction of the mixing cylinder, and the vibrating end of the vibrating motor is connected to the feeding hopper.

[0019] By adopting the above technical solution, the feeding mechanism is installed on the support, and the feeding mechanism includes a feeding hopper and a vibrating motor; when mixing and stirring the ointment, place the ointment raw materials to be mixed in the feeding hopper, start the vibrating motor, and through the vibrating action, the ointment raw materials in the feeding hopper can smoothly flow into the mixing cylinder; through the arrangement of the feeding hopper and the vibrating motor, it helps to reduce the possibility of the ointment raw materials being blocked or forming lumps in the feeding hopper, ensuring that the raw materials can enter the mixing cylinder evenly and continuously.

[0020] Optionally, a buffer mechanism is further arranged on the support. The buffer mechanism includes a buffer spring, a spring fixing seat and a feeding fixing seat. The spring fixing seat is connected to the support, the feeding fixing seat is connected to the bottom of the feeding hopper, and the two ends of the buffer spring are respectively connected to the spring fixing seat and the feeding fixing seat.

[0021] By adopting the above technical solution, the buffer mechanism is installed on the support, and the buffer mechanism includes a buffer spring, a spring fixing seat and a feeding fixing seat; through the arrangement of the buffer spring, the spring fixing seat and the feeding fixing seat, these vibrations and impact forces can be effectively reduced, improving the stability and reliability of the equipment and prolonging the service life.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] Through the settings of the stirring motor, the stirring rod, a plurality of connecting rods and a plurality of scraping plates, etc., the scraping plates can continuously scrape the ointment attached to the cylinder wall, effectively reducing the waste of the ointment, improving the production efficiency, reducing the production cost, ensuring the uniform stirring of the ointment, guaranteeing the quality and uniformity of the ointment, and at the same time making the cleaning work of the equipment simple and fast, reducing the ointment residue on the inner wall, reducing the cleaning difficulty, and further ensuring the product quality of the next production;

[0024] Through the setting of the elastic protective sleeve, it is possible to reduce the scratching caused by the direct contact between the paste scraping plate and the inner wall of the mixing cylinder when scraping the paste. This not only protects the smoothness and durability of the inner wall of the mixing cylinder, but also ensures that the paste scraping plate itself will not be damaged due to long-term friction with the hard inner wall, thus extending its service life.

[0025] Through the setting of a number of scraping teeth on the wall, the contact area of the elastic protective sleeve is increased, and it can more effectively scrape the paste adhering to the cylinder wall. The scraping teeth on the wall can penetrate into the adhesion layer of the paste to ensure that the paste is completely scraped off and avoid residue. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a mixing device for paste production in an embodiment of the present application.

[0027] Figure 2 It is a front view of a mixing device for paste production in an embodiment of the present application.

[0028] Figure 3 It is a schematic structural diagram for embodying the stirring mechanism in an embodiment of the present application.

[0029] Figure 4 is Figure 3 An enlarged view of part A of.

[0030] Description of the reference numerals: 1, frame; 2, mixing cylinder; 3, feeding mechanism; 31, feeding hopper; 32, vibrating motor; 4, stirring mechanism; 41, stirring motor; 42, stirring rod; 43, connecting rod; 44, paste scraping plate; 5, elastic protective sleeve; 51, notch; 52, scraping teeth on the wall; 6, lifting mechanism; 61, lifting oil cylinder; 62, lifting seat; 7, guide rod; 8, support; 81, rib plate; 9, buffer mechanism; 91, buffer spring; 92, spring fixing seat; 93, feeding fixing seat. Detailed Description of the Embodiment

[0031] The following will Figures 1-4 make a further detailed description of the present application in conjunction with the attached

[0032] The embodiment of the present application discloses a mixing device for paste production. Referring to Figure 1 , the mixing device for paste production includes a frame 1, which can be made by welding multiple square steels. A support 8 is installed on the frame 1 through bolts, and a mixing cylinder 2 is installed on the support 8. The inside of the mixing cylinder 2 is a hollow structure, and the mixing cylinder 2 is cylindrical. A feeding mechanism 3 is installed at the inlet of the mixing cylinder 2, and a stirring mechanism 4 is installed inside the mixing cylinder 2. In this embodiment, the feeding mechanism 3 is used to feed the paste raw materials into the mixing cylinder 2, and the stirring mechanism 4 is used to fully stir the paste raw materials in the mixing cylinder 2.

[0033] Referring to Figure 1 andFigure 2 Several rib plates 81 are welded and fixed on the support 8, and the rib plates 81 effectively enhance the bearing capacity and rigidity of the support 8, as well as the stability of the overall structure.

[0034] Refer to Figure 1 , the feeding mechanism 3 includes a feeding hopper 31 and a vibrating motor 32. The feeding hopper 31 is funnel-shaped and is arranged towards the opening of the mixing cylinder 2. The output end of the vibrating motor 32 is installed on the feeding hopper 31; through the vibrating action, the ointment raw materials in the feeding hopper 31 can smoothly flow into the mixing cylinder 2, which helps to reduce the possibility of blockage or agglomeration of the ointment raw materials in the feeding hopper 31 and ensures that the raw materials can enter the mixing cylinder 2 evenly and continuously.

[0035] Refer to Figure 1 and Figure 2 , a buffer mechanism 9 is installed on the support 8. The buffer mechanism 9 can be in two groups, and the two groups of buffer mechanisms 9 are symmetrically installed on the support 8. Each buffer mechanism 9 includes a buffer spring 91, a spring fixing seat 92 and a feeding fixing seat 93. The spring fixing seat 92 is installed and fixed on the support 8, the feeding fixing seat 93 is installed and fixed at the bottom of the feeding hopper 31, the feeding fixing seat 93 corresponds to the spring fixing seat 92, and both ends of the buffer spring 91 are respectively installed on the spring fixing seat 92 and the feeding fixing seat 93. In this embodiment, the number of buffer springs 91 can be multiple groups, and each buffer spring 91 has a corresponding damper; it is used to effectively reduce vibration and impact force, improve the stability and reliability of the equipment, and extend the service life.

[0036] Refer to Figure 2 and Figure 3 , the stirring mechanism 4 includes a stirring motor 41, a stirring rod 42, several connecting rods 43 and several scraping plates 44. The stirring motor 41 is installed at the bottom of the mixing cylinder 2, the stirring rod 42 is rotatably installed in the mixing cylinder 2 through a bearing, and the stirring rod 42 is located at the center of the mixing cylinder 2. The end of the stirring rod 42 is fixedly connected to the output end of the stirring motor 41. Several connecting rods 43 are sequentially installed along the length direction of the stirring rod 42. The number of connecting rods 43 is the same as the number of scraping plates 44. The scraping plates 44 are installed at the ends of the corresponding connecting rods 43, and the scraping plates 44 correspond to the inner wall of the mixing cylinder 2.

[0037] Refer to Figure 2 and Figure 4 , an elastic protective sleeve 5 is installed at the end of each scraping plate 44. A notch 51 for embedding the scraping plate 44 is provided on the elastic protective sleeve 5. In this embodiment, the elastic protective sleeve 5 can be made of rubber material, and the elastic protective sleeve 5 abuts against the inner wall of the mixing cylinder 2; it can reduce the scratching caused by the direct contact between the scraping plate 44 and the inner wall of the mixing cylinder 2 when scraping the ointment, not only protecting the smoothness and durability of the inner wall of the mixing cylinder 2, but also ensuring that the scraping plate 44 itself will not be damaged due to long-term friction with the hard inner wall, and extending the service life.

[0038] Refer to Figure 2 and Figure 4 , several scraping teeth 52 are integrally formed at the abutting end of the elastic retaining sleeve 5. The scraping teeth 52 protrude towards the outside of the elastic retaining sleeve 5, which increases the contact area of the elastic retaining sleeve 5 and can more effectively scrape the ointment attached to the cylinder wall. The scraping teeth 52 can penetrate into the attachment layer of the ointment to ensure that the ointment is completely scraped off and avoid residue.

[0039] Refer to Figure 2 , a lifting mechanism 6 is installed on the frame 1. The lifting mechanism 6 includes a lifting oil cylinder 61 and a lifting seat 62. The lifting oil cylinder 61 is installed on the frame 1. The lifting oil cylinder 61 is located below the mixing cylinder 2. The lifting oil cylinder 61 is vertically arranged towards the mixing cylinder 2. The lifting seat 62 is installed on the output end of the lifting oil cylinder 61. The stirring motor 41 is installed on the lifting seat 62. In this embodiment, the lifting mechanism 6 realizes the lifting of the stirring rod 42 in a small range, and the lifting mechanism 6 does not affect the normal operation of the stirring motor 41 and the stirring rod 42.

[0040] Refer to Figure 2 , a guide rod 7 is vertically installed at the bottom of the mixing cylinder 2. A through hole is formed through the lifting seat 62, so that the lifting seat 62 is slidably connected to the guide rod 7 through the through hole. The guide rod 7 provides a stable movement track for the lifting seat 62, ensuring that the lifting seat 62 can smoothly and accurately slide up and down along the guide rod 7 under the drive of the lifting oil cylinder 61, reducing the possibility of shaking or deviation that may occur during the movement of the lifting seat 62, and ensuring the stable operation of components such as the stirring motor 41, the stirring rod 42, the connecting rod 43, and the scraping plate 44.

[0041] The implementation principle of a mixing device for ointment production in an embodiment of the present application is as follows: In the mixing device for ointment production, the ointment raw materials to be mixed are placed in the feeding hopper 31. The vibrating motor 32 is started, and through the vibrating action, the ointment raw materials in the feeding hopper 31 smoothly flow into the mixing cylinder 2. The lifting oil cylinder 61 is in a contracted state, and the lifting seat 62 is located at the lowest position. The stirring motor 41 starts to operate, driving the stirring rod 42 to slowly rotate inside the mixing cylinder 2. As the stirring rod 42 rotates, the connecting rod 43 and the scraping plate 44 also move synchronously. The scraping plate 44 continuously scrapes the ointment attached to the inner wall of the mixing cylinder 2, making it re-participate in the stirring process to achieve uniform mixing of the ointment;

[0042] After the stirring has been carried out for a certain period of time, the lifting oil cylinder 61 starts to extend, pushing the lifting seat 62 and the stirring motor 41, stirring rod 42, connecting rod 43 and scraping plate 44 thereon to move upward as a whole. During this process, the scraping plate 44 always clings to the inner wall of the mixing cylinder 2 and continues to scrape the remaining ointment during the movement. When the lifting seat 62 rises to a certain height, the lifting oil cylinder 61 starts to contract, driving the lifting seat 62 and the components thereon to move downward. During this process, the scraping plate 44 scrapes the possibly remaining ointment along the inner wall of the mixing cylinder 2 again to ensure the cleanliness of the cylinder wall. The extension and contraction of the lifting oil cylinder 61 can form a reciprocating cycle. According to the characteristics of the ointment and the needs of stirring, an appropriate number of reciprocating times and frequencies can be set. Through the reciprocating movement of the lifting mechanism 6, the scraping plate 44 can scrape the ointment on the inner wall of the mixing cylinder 2 more comprehensively, ensuring the mixing effect while reducing residues. When the ointment reaches the predetermined mixing effect, the stirring motor 41 stops operating, and the lifting oil cylinder 61 remains in a suitable position, waiting for the next feeding and stirring operation; through the settings of the stirring motor 41, stirring rod 42, several connecting rods 43 and several scraping plates 44, etc., the scraping plate 44 can continuously scrape the ointment adhering to the cylinder wall, effectively reducing the waste of the ointment, improving the production efficiency, reducing the production cost, ensuring the uniform stirring of the ointment, guaranteeing the quality and uniformity of the ointment, and at the same time making the cleaning work of the equipment simple and fast, reducing the ointment residue on the inner wall, reducing the cleaning difficulty, and further ensuring the product quality of the next production.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A mixing device for ointment production, comprising a frame (1), characterized in that: The frame (1) is provided with a mixing drum (2), and the mixing drum (2) is provided with a feeding mechanism (3) and a stirring mechanism (4). The feeding mechanism (3) is arranged at the opening of the mixing drum (2), and the stirring mechanism (4) comprises a stirring motor (41), a stirring rod (42), a plurality of connecting rods (43) and a plurality of scraping plates (44). The stirring motor (41) is arranged at the bottom of the mixing drum (2), and the stirring rod (42) is rotatably arranged in the mixing drum (2). The stirring rod (42) is connected to the output end of the stirring motor (41), and the plurality of connecting rods (43) are arranged in sequence along the length direction of the stirring rod (42). The plurality of scraping plates (44) correspond to the plurality of connecting rods (43) one by one, and the scraping plates (44) are connected to the ends of the connecting rods (43). The scraping plates (44) abut against the inner wall of the mixing drum (2).

2. A mixing device for ointment production according to claim 1, characterized in that: The abutting end of the cream scraper plate (44) is provided with an elastic wall protection sleeve (5) for preventing scratches, and the elastic wall protection sleeve (5) is provided with a notch (51) for embedding the cream scraper plate (44).

3. A mixing device for ointment production according to claim 2, characterized in that: The elastic wall protection sleeve (5) is provided with a plurality of wall scraping protruding teeth (52), and the plurality of wall scraping protruding teeth (52) are sequentially arranged at the abutting end of the elastic wall protection sleeve (5).

4. A mixing device for ointment production according to claim 1, characterized in that: The frame (1) is provided with a lifting mechanism (6), the lifting mechanism (6) comprising a lifting cylinder (61) and a lifting seat (62), the lifting cylinder (61) being connected to the frame (1), the lifting cylinder (61) being arranged below the mixing barrel (2), the lifting seat (62) being connected to the output end of the lifting cylinder (61), and the stirring motor (41) being connected to the lifting seat (62).

5. A mixing device for ointment production according to claim 4, characterized in that: A guide rod (7) is vertically arranged at the bottom of the mixing cylinder (2), and the lifting seat (62) is slidably connected to the guide rod (7).

6. A mixing device for ointment production according to claim 1, characterized in that: The frame (1) is provided with a support (8), the mixing cylinder (2) is connected to the support (8), and the support (8) is provided with a plurality of ribs (81) for improving structural strength.

7. A mixing device for ointment production according to claim 6, characterized in that: The feeding mechanism (3) is arranged on a support (8), and comprises a feeding hopper (31) and a vibrating motor (32). The feeding hopper (31) is connected to the support (8), and the feeding hopper (31) is arranged toward the opening direction of the mixing barrel (2), and the vibrating end of the vibrating motor (32) is connected to the feeding hopper (31).

8. A mixing device for ointment production according to claim 7, characterized in that: The support (8) is also provided with a buffer mechanism (9), the buffer mechanism (9) comprising a buffer spring (91), a spring fixing seat (92) and a feeding fixing seat (93), the spring fixing seat (92) being connected to the support (8), the feeding fixing seat (93) being connected to the bottom of the feeding hopper (31), and the two ends of the buffer spring (91) being respectively connected to the spring fixing seat (92) and the feeding fixing seat (93).

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