Paste booster

Abstract

The utility model relates to a paste booster which comprises an outer shell, an inner support arranged in the outer shell, a servo motor installed on the inner support, a motor gear driven by the servo motor, a lead screw gear driven by the motor gear, a propelling lead screw connected with the lead screw gear in a meshed mode and a push block arranged at the end of the propelling lead screw. The paste injector is placed in the shell and can be pushed by the pushing block, a channel is dug in the inner support, and the pushing lead screw is arranged in the channel and can move along the channel. According to the paste booster, the motor drives the gear, then the gear drives the lead screw, the lead screw pushes the push rod of the injector, the paste booster is compact in structure and small in occupied space, the inner support is provided with the channel in a digging mode, the channel is used for containing and pushing the lead screw and allows the lead screw to move along the channel, a metal sliding rail does not need to be additionally manufactured, cost can be effectively saved, and production efficiency is improved. And the propelling screw rod is more convenient to mount and adjust, and meanwhile, the stability and the reliability of the whole system are also improved.

Description

Technical Field

[0001] The utility model relates to the field of dental instruments, in particular to a paste booster. Background Art

[0002] The design of traditional paste boosters usually uses a motor to drive the screw, which further drives the nut, and finally the nut pushes the plunger of the syringe. However, this design has obvious shortcomings: due to the structural characteristics of the screw and nut, they occupy a large space, which directly leads to the increase of the shell volume. The larger shell not only increases the size and weight of the entire device, but also may affect the user's grip, making the operation less comfortable and convenient.

[0003] In addition, since the screw and nut occupy a large space, this also limits the layout and optimization space of other components inside the equipment, which may affect the overall performance and reliability of the equipment. For example, in order to accommodate larger screws and nuts, it may be necessary to sacrifice the compactness and stability of some internal structures, which may cause wear and failure rate of the equipment in long-term use. Utility Model Content

[0004] In view of this, the utility model provides a paste booster, in which a motor drives a gear, which in turn drives a screw, and the screw pushes the push rod of the syringe. The structure is compact and occupies a small space. A channel is dug in the inner bracket, and the channel is used to accommodate the push screw and allow it to move along the channel. There is no need to make a metal slide rail separately, which can effectively save costs and make the installation and adjustment of the push screw more convenient, while also improving the stability and reliability of the entire system.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A paste booster comprises an outer shell, an inner bracket arranged inside the outer shell, a servo motor installed on the inner bracket, a motor gear driven by the servo motor, a screw gear driven by the motor gear, a propulsion screw meshingly connected to the screw gear, and a push block arranged at the end of the propulsion screw. A paste syringe is placed inside the outer shell and can be pushed by the push block. The inner bracket is dug with a channel, and the propulsion screw is arranged in the channel and can move along the channel.

[0007] In the field of paste delivery, traditional delivery methods often have problems such as low efficiency and low control accuracy. In order to solve these problems, we have developed a new type of paste booster, which adopts a precision mechanical structure design to achieve efficient and accurate delivery of paste. The core components of the paste booster include a shell, an inner bracket, a servo motor, a motor gear, a screw gear, a push screw and a push block. The shell, as an external structure, provides a stable support environment. The inner bracket is installed inside the shell to fix and support other internal components. The servo motor is used as a power source to drive the operation of the entire system. The motor gear is connected to the servo motor to convert the rotational motion of the motor into the rotational motion of the gear. The screw gear is meshed with the motor gear to convert the rotational motion of the gear into the linear motion of the screw. The push screw is arranged in the channel and can move along the channel to achieve the advancement of the paste. The push block is installed at the end of the push screw, contacts the paste syringe, and pushes the paste out of the syringe. In particular, the inner bracket is dug with a channel, which is used to accommodate the push screw and allow it to move along the channel. This design does not require the production of additional metal slide rails, which can effectively save costs and make the installation and adjustment of the push screw more convenient, while also improving the stability and reliability of the entire system. The paste syringe is placed inside the housing and can be pushed by the push block. During operation, the servo motor drives the motor gear to rotate, which in turn drives the screw gear to rotate. The screw gear converts the rotational motion into the linear motion of the screw, pushing the push screw to move in the channel. When the push screw reaches a certain position, the push block pushes the paste syringe forward to squeeze out the paste.

[0008] Compared with the traditional paste delivery method, the paste booster of the present invention has the following advantages:

[0009] Efficient transmission: Through the precise gear transmission mechanism, efficient and stable transmission of paste is achieved, thus improving production efficiency.

[0010] Precise control: The precise control of the servo motor enables the paste delivery volume and speed to be precisely adjusted to meet different production needs.

[0011] Compact structure: The overall design is compact and occupies little space, making it easy to transport the paste in a limited space.

[0012] Easy to maintain: The connection between the components is firm and reliable, and the disassembly is easy, which facilitates daily maintenance and care.

[0013] Preferably, a pin is connected to the end of the advancement screw rod, a groove is provided on the channel, and the pin is placed in the groove and can slide along the groove.

[0014] In terms of the pin and groove design, the end of the push screw is connected with a pin, and a groove is provided on the channel, and the pin is placed in the groove and can slide along the groove. The advantage of this design is that it provides greater flexibility for the positioning and adjustment of the push screw. During installation or maintenance, if the position of the push screw needs to be adjusted, it can be easily moved in the groove by sliding the pin without disassembling the entire structure, which greatly saves time and reduces labor intensity. In addition, the combination of the pin and the groove also improves the stability of the system and ensures the precise movement of the push screw during work.

[0015] Preferably, the inner bracket includes an inner bracket upper portion and an inner bracket lower portion, and the channel is enclosed by the inner bracket upper portion and the inner bracket lower portion.

[0016] In terms of the design of the pin and the groove, the end of the push screw is connected with a pin, and the channel is provided with a groove, and the pin is placed in the groove and can slide along the groove. The advantage of this design is that it provides a stable support for the movement of the push screw. Since the pin is placed in the groove and can slide along the groove, when the servo motor drives the motor gear to rotate, it drives the screw gear to rotate, and the screw gear drives the push screw to rotate. However, since the end of the push screw is connected with a pin, and the pin is placed in the groove and can slide along the groove, the push screw does not rotate at this time, but moves forward or backward along the direction of the channel, thereby pushing the paste injector. The cooperation of the pin and the groove improves the stability of the system and ensures the precise movement of the push screw during the working process.

[0017] Preferably, a first groove is dug on the lower surface of the inner bracket, a second groove is dug on the upper surface under the inner bracket, and the channel is enclosed by the first groove and the second groove.

[0018] In terms of the structure of the inner bracket, the upper inner bracket and the lower inner bracket jointly enclose the channel, and the shape of the channel is determined by the first groove and the second groove. The advantage of this design is that it simplifies the structure of the inner bracket, making production and assembly more convenient. At the same time, the design of the first groove and the second groove also provides an accurate reference for the positioning of the channel, ensuring the consistency of the size and shape of the channel, thereby improving the reliability of the entire system.

[0019] Preferably, the groove includes a left groove and a right groove that are opposite to each other, and one end of the pin is placed in the left groove, and the other end is placed in the right groove.

[0020] By introducing the pin and groove design, as well as improving the internal bracket structure, higher work efficiency and better user experience are achieved. These designs not only improve the stability and reliability of the system, but also provide users with more convenience and flexibility.

[0021] Preferably, the left groove includes an upper left groove arranged on the inner bracket and a lower left groove arranged under the inner bracket, and the right groove includes an upper right groove arranged on the inner bracket and a lower right groove arranged under the inner bracket.

[0022] In terms of the design of the left groove and the right groove, the left groove includes an upper left groove arranged on the inner bracket and a lower left groove arranged under the inner bracket, while the right groove includes an upper right groove arranged on the inner bracket and a lower right groove arranged under the inner bracket. The advantage of this design is that it provides a more stable and precise guiding effect. The upper left groove and the upper right groove cooperate with the corresponding lower left groove and the lower right groove to ensure the stability of the push screw during movement and reduce the deviation caused by vibration or impact. This stability is essential to maintain the continuity and accuracy of paste delivery. This design also allows the push screw to move more smoothly in the channel. Due to the presence of the groove, the push screw can reduce friction with the channel wall when moving, reduce energy loss, and thus improve work efficiency. At the same time, the design of the groove also helps to dissipate heat and extend the service life of the equipment.

[0023] Preferably, a mounting hole is dug at the end of the advancement screw rod, and the pin passes through the mounting hole.

[0024] In terms of the design of the push screw, a mounting hole is dug at its end, and a pin passes through the mounting hole. The advantage of this design is that it provides a more secure connection. The design of the mounting hole enables the pin to be firmly fixed to the end of the push screw, and the presence of the pin ensures the stability of the push screw during operation. This connection method not only improves the stability of the system, but also allows for quick disassembly and installation during maintenance or replacement of parts, greatly saving time.

[0025] Preferably, the upper inner bracket and the lower inner bracket are snap-connected.

[0026] The upper and lower inner brackets are connected by snap-on connection. The snap-on connection is simple and easy. You only need to align the two parts and press them lightly to complete the connection. No tools are required, which greatly simplifies the assembly process. The snap-on design ensures the stability of the inner bracket. Once connected, the inner bracket will not loosen or fall off easily, and can maintain good structural integrity even in harsh working environments. In addition, the snap-on connection is also convenient for quick disassembly and maintenance. When the inner bracket needs to be replaced or cleaned, it can be quickly removed, which greatly saves maintenance time.

[0027] Preferably, the shell is provided with an observation port, and the position of the observation port corresponds to the position of the paste injector.

[0028] An observation port is provided on the housing, and its position corresponds to the paste injector. The setting of the observation port allows the user to easily observe the status of the paste injector, such as the remaining amount of paste, whether the injector is blocked, etc., so as to take corresponding measures in time, such as replenishing the paste or cleaning the injector. This design improves the user's ability to monitor the paste delivery process and makes the operation more intuitive and convenient. At the same time, the observation port can also be used as a maintenance window, which is convenient for users to inspect and maintain internal components. In addition, the design of the observation port also takes into account aesthetics, making the entire device look neater and more professional.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The paste booster of the utility model adopts a precision mechanical structure design to achieve efficient and accurate delivery of the paste. The core components of the paste booster include a shell, an inner bracket, a servo motor, a motor gear, a screw gear, a push screw and a push block. The shell, as an external structure, provides a stable support environment. The inner bracket is installed inside the shell to fix and support other internal components. The servo motor is used as a power source to drive the operation of the entire system. The motor gear is connected to the servo motor to convert the rotational motion of the motor into the rotational motion of the gear. The screw gear is meshed with the motor gear to convert the rotational motion of the gear into the linear motion of the screw. The push screw is arranged in the channel and can move along the channel to achieve the advancement of the paste. The push block is installed at the end of the push screw, contacts the paste syringe, and pushes the paste out of the syringe. In particular, the inner bracket is dug with a channel, which is used to accommodate the push screw and allow it to move along the channel. This design does not require the production of a metal slide rail, which can effectively save costs, and makes the installation and adjustment of the push screw more convenient, while also improving the stability and reliability of the entire system. The paste injector is placed inside the housing and can be pushed by the push block. During operation, the servo motor drives the motor gear to rotate, which in turn drives the screw gear to rotate. The screw gear converts the rotational motion into the linear motion of the screw, pushing the push screw to move in the channel. When the push screw reaches a certain position, the push block pushes the paste injector forward to squeeze out the paste. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a structural diagram of a paste booster according to an embodiment of the utility model.

[0033] Figure 2 This is a partial structural diagram of a paste booster according to an embodiment of the utility model.

[0034] Figure 3 This is a partial structural diagram of the interior of a paste booster according to an embodiment of the utility model.

[0035] Figure 4 This is a structural diagram of an inner bracket in one embodiment of the utility model. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0040] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0041] The present embodiment provides a paste booster, including a housing 100, an inner bracket 200 disposed inside the housing 100, a servo motor 300 installed on the inner bracket 200, a motor gear 400 driven by the servo motor 300, a screw gear 500 driven by the motor gear 400, a push screw 600 meshingly connected with the screw gear 500, and a push block 700 disposed at the end of the push screw 600. The paste injector 001 is placed inside the housing 100 and can be pushed by the push block 700. The inner bracket 200 is provided with a channel 210, and the push screw 600 is disposed in the channel 210 and can move along the channel 210. The battery 310 is used to supply power and drive the servo motor 300 to rotate.

[0042] In the field of paste delivery, traditional delivery methods often have problems such as low efficiency and low control accuracy. In order to solve these problems, we have developed a new type of paste booster, which adopts a precision mechanical structure design to achieve efficient and accurate delivery of paste. The core components of the paste booster include a shell 100, an inner bracket 200, a servo motor 300, a motor gear 400, a screw gear 500, a propulsion screw 600, and a push block 700. The shell 100, as an external structure, provides a stable support environment. The inner bracket 200 is installed inside the shell 100 to fix and support other internal components. The servo motor 300 is used as a power source to drive the operation of the entire system. The motor gear 400 is connected to the servo motor 300 to convert the rotational motion of the motor into the rotational motion of the gear. The screw gear 500 is meshed with the motor gear 400 to convert the rotational motion of the gear into the linear motion of the screw. The propulsion screw 600 is arranged in the channel 210 and can move along the channel 210 to achieve the advancement of the paste. The push block 700 is installed at the end of the push screw 600, contacts the paste injector, and pushes the paste out of the injector. In particular, the inner bracket 200 is provided with a channel 210, which is used to accommodate the push screw 600 and allow it to move along the channel 210. This design does not require the production of a metal slide rail, which can effectively save costs, and makes the installation and adjustment of the push screw 600 more convenient, while also improving the stability and reliability of the entire system. The paste injector is placed inside the housing 100 and can be pushed by the push block 700. During operation, the servo motor 300 drives the motor gear 400 to rotate, thereby driving the screw gear 500 to rotate. The screw gear 500 converts the rotational motion into the linear motion of the screw, pushing the push screw 600 to move in the channel 210. When the push screw 600 reaches a certain position, the push block 700 pushes the paste injector forward to extrude the paste.

[0043] Compared with the traditional paste delivery method, the paste booster of the present invention has the following advantages:

[0044] Efficient transmission: Through the precise gear transmission mechanism, efficient and stable transmission of paste is achieved, thus improving production efficiency.

[0045] Precise control: The precise control of the servo motor 300 enables the paste delivery volume and speed to be precisely adjusted to meet different production needs.

[0046] Compact structure: The overall design is compact and occupies little space, making it easy to transport the paste in a limited space.

[0047] Easy to maintain: The connection between the components is firm and reliable, and the disassembly is easy, which facilitates daily maintenance and care.

[0048] In this embodiment, a pin is connected to the end of the advancement screw 600 , and a groove 211 is provided on the channel 210 . The pin is placed in the groove 211 and can slide along the groove 211 .

[0049] In terms of the design of the pin and the groove 211, the end of the push screw 600 is connected with a pin, and the channel 210 is provided with a groove 211, and the pin is placed in the groove 211 and can slide along the groove 211. The advantage of this design is that it provides greater flexibility for the positioning and adjustment of the push screw 600. During installation or maintenance, if the position of the push screw 600 needs to be adjusted, it can be easily moved in the groove 211 by sliding the pin without disassembling the entire structure, which greatly saves time and reduces labor intensity. In addition, the cooperation of the pin and the groove 211 also improves the stability of the system and ensures the precise movement of the push screw 600 during operation.

[0050] In this embodiment, the inner bracket 200 includes an inner bracket upper portion 220 and an inner bracket lower portion 230 , and the channel 210 is enclosed by the inner bracket upper portion 220 and the inner bracket lower portion 230 .

[0051] In terms of the design of the pin and the groove 211, the end of the push screw 600 is connected with a pin, and the channel 210 is provided with a groove 211, and the pin is placed in the groove 211 and can slide along the groove 211. The advantage of this design is that it provides a stable support for the movement of the push screw 600. Since the pin is placed in the groove 211 and can slide along the groove 211, when the servo motor 300 drives the motor gear 400 to rotate, it drives the screw gear 500 to rotate, and the screw gear 500 drives the push screw 600 to rotate. However, since the end of the push screw 600 is connected with a pin, and the pin is placed in the groove 211 and can slide along the groove 211, the push screw 600 does not rotate at this time, but moves forward or backward along the direction of the channel 210, thereby pushing the paste injector. The cooperation of the pin and the groove 211 improves the stability of the system and ensures the precise movement of the push screw 600 during the working process.

[0052] In this embodiment, a first groove 221 is dug on the lower surface of the inner bracket upper 220 , a second groove 231 is dug on the upper surface of the inner bracket lower 230 , and the channel 210 is enclosed by the first groove 221 and the second groove 231 .

[0053] In terms of the structure of the inner bracket 200, the upper inner bracket 220 and the lower inner bracket 230 jointly enclose the channel 210, and the shape of the channel 210 is determined by the first groove 221 and the second groove 231. The advantage of this design is that it simplifies the structure of the inner bracket 200, making production and assembly more convenient. At the same time, the design of the first groove 221 and the second groove 231 also provides an accurate reference for the positioning of the channel 210, ensuring the consistency of the size and shape of the channel 210, thereby improving the reliability of the entire system.

[0054] In this embodiment, the groove 211 includes a left groove 212 and a right groove 213 that are opposite to each other. One end of the pin is placed in the left groove 212 , and the other end of the pin is placed in the right groove 213 .

[0055] By introducing the design of the pin and the groove 211 and improving the structure of the inner bracket 200, higher working efficiency and better user experience are achieved. These designs not only improve the stability and reliability of the system, but also provide users with more convenience and flexibility.

[0056] In this embodiment, the left groove 212 includes an upper left groove 214 disposed on the inner bracket 220 and a lower left groove 215 disposed under the inner bracket 230, and the right groove 213 includes an upper right groove 216 disposed on the inner bracket 220 and a lower right groove 217 disposed under the inner bracket 230.

[0057] In terms of the design of the left groove 212 and the right groove 213, the left groove 212 includes an upper left groove 214 disposed on the inner bracket 220 and a lower left groove 215 disposed on the lower inner bracket 230, while the right groove 213 includes an upper right groove 216 disposed on the inner bracket 220 and a lower right groove 217 disposed on the lower inner bracket 230. The advantage of this design is that it provides a more stable and precise guiding effect. The upper left groove 214 and the upper right groove 216 cooperate with the corresponding lower left groove 215 and the lower right groove 217 to ensure the stability of the push screw 600 during movement and reduce the deviation caused by vibration or impact. This stability is essential for maintaining the continuity and accuracy of paste delivery. This design also allows the push screw 600 to move more smoothly in the channel 210. Due to the presence of the groove 211, the push screw 600 can reduce the friction with the wall of the channel 210 when moving, reduce energy loss, and thus improve work efficiency. At the same time, the design of the groove 211 also helps to dissipate heat and extend the service life of the device.

[0058] In this embodiment, a mounting hole is dug at the end of the advancement screw rod 600, and a pin passes through the mounting hole.

[0059] In terms of the design of the push screw 600, a mounting hole is dug at its end, and a pin passes through the mounting hole. The advantage of this design is that it provides a more secure connection. The design of the mounting hole enables the pin to be firmly fixed to the end of the push screw 600, and the presence of the pin ensures the stability of the push screw 600 during operation. This connection method not only improves the stability of the system, but also allows for quick disassembly and installation during maintenance or replacement of components, greatly saving time.

[0060] In this embodiment, the upper inner bracket 220 and the lower inner bracket 230 are snap-connected.

[0061] The upper inner bracket 220 and the lower inner bracket 230 are connected by snap-fit ​​connection. The snap-fit ​​connection is simple and easy. The connection can be completed by aligning the two parts and lightly pressing them. No tools are required, which greatly simplifies the assembly process. The snap-fit ​​design ensures the stability of the inner bracket 200. Once connected, the inner bracket 200 will not loosen or fall off easily, and can maintain good structural integrity even in harsh working environments. In addition, the snap-fit ​​connection is also convenient for quick disassembly and maintenance. When the inner bracket 200 needs to be replaced or cleaned, it can be quickly removed, which greatly saves maintenance time.

[0062] In this embodiment, the housing 100 is provided with an observation port 110 , and the position of the observation port 110 corresponds to the position of the paste injector.

[0063] The housing 100 is provided with an observation port 110, which is located corresponding to the paste syringe. The setting of the observation port 110 allows the user to easily observe the status of the paste syringe, such as the remaining amount of paste, whether the syringe is blocked, etc., so as to take corresponding measures in time, such as replenishing the paste or cleaning the syringe. This design improves the user's ability to monitor the paste delivery process and makes the operation more intuitive and convenient. At the same time, the observation port 110 can also be used as a maintenance window, which is convenient for the user to inspect and maintain the internal components. In addition, the design of the observation port 110 also takes into account aesthetics, making the entire device look more neat and professional.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A paste booster, characterized in that: It includes an outer shell, an inner bracket arranged inside the outer shell, a servo motor installed on the inner bracket, a motor gear driven by the servo motor, a screw gear driven by the motor gear, a propulsion screw meshing with the screw gear, and a push block arranged at the end of the propulsion screw. The paste injector is placed inside the outer shell and can be pushed by the push block. The inner bracket is dug with a channel, and the propulsion screw is arranged in the channel and can move along the channel.

2. The paste booster according to claim 1, characterized in that: The end of the advancing screw rod is connected with a pin, and the channel is provided with a groove, and the pin is placed in the groove and can slide along the groove.

3. The paste booster according to claim 2, characterized in that: The inner support comprises an inner support upper portion and an inner support lower portion, and the channel is formed by enclosing the inner support upper portion and the inner support lower portion.

4. The paste booster according to claim 3, characterized in that: A first groove is dug on the lower surface of the inner bracket, a second groove is dug on the upper surface under the inner bracket, and the channel is enclosed by the first groove and the second groove.

5. The paste booster according to claim 4, characterized in that: The groove comprises a left groove and a right groove which are opposite to each other, one end of the pin is placed in the left groove, and the other end of the pin is placed in the right groove.

6. The paste booster according to claim 5, characterized in that The left groove includes an upper left groove arranged on the inner bracket and a lower left groove arranged under the inner bracket.

7. The paste booster according to claim 6, characterized in that The right groove includes an upper right groove arranged on the inner bracket and a lower right groove arranged under the inner bracket.

8. The paste booster according to claim 7, characterized in that A mounting hole is dug at the end of the advancement screw rod, and the pin passes through the mounting hole.

9. The paste booster according to claim 8, characterized in that The upper inner bracket and the lower inner bracket are connected by buckles.

10. The paste booster according to claim 9, characterized in that The shell is provided with an observation port, and the position of the observation port corresponds to the position of the paste injector.

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