Rubber cutting device for silicone rubber production

Abstract

The utility model belongs to the technical field of rubber processing, and particularly relates to a silicone rubber production rubber cutting device which comprises a machine body and two connecting plates, fixing pieces are fixedly connected to the front side and the rear side of the outer wall of the machine body, vertical plates are fixedly connected to the adjacent sides of the multiple fixing pieces, sliding grooves are formed in the adjacent sides of the two vertical plates, and the connecting plates are fixedly connected to the vertical plates. Sliding blocks are fixedly connected to the sides, away from each other, of the two connecting plates, fixing holes are formed in the sides, away from each other, of the two sliding blocks, clamping strips are slidably connected to the outer walls of the two vertical plates, and the outer walls of the clamping strips are fixedly connected to the inner walls of the fixing holes; the adjacent sides of the two connecting plates are each rotationally connected with a pressure roller frame. According to the utility model, the sliding block is manually adjusted and operated to slide in the sliding chute, and after the connecting plate reaches a proper height, the height adjustment of the lower pressing roller frame is completed, so that a certain downward pressure is applied to the top of the silicon rubber in the transportation process, and the track of the silicon rubber is prevented from deviating.

Description

Technical Field

[0001] This utility model belongs to the field of rubber processing technology, and in particular relates to a rubber cutting device for silicone rubber production. Background Technology

[0002] Silicone rubber is a high-molecular elastic material with significant high-temperature and low-temperature resistance. Its insulating properties and chemical inertness make it an ideal choice for electronic packaging, medical devices, and industrial sealing. The production process includes raw material mixing and molding, as well as vulcanization. The molded rubber compound needs to be cut into specified sizes. The rubber cutting device uses hydraulic drive and high-hardness blades to achieve precise cutting. The cutting angle and thickness are adjusted through an automated positioning system to reduce material loss and improve processing efficiency. This equipment plays an important role in improving product consistency and process stability in the continuous production of silicone rubber.

[0003] The operating principle of traditional silicone rubber production cutting equipment is to drive the blades to reciprocate through a hydraulic or pneumatic system, using mechanical pressure to cut the block silicone rubber into predetermined sizes. During operation, the rubber position needs to be manually adjusted and fixed to ensure cutting accuracy. This type of equipment has a relatively simple structure and mainly relies on human assistance to complete material positioning and clamping. In long-term use, the cutting accuracy is greatly affected by human factors, resulting in deviations in the size of the finished product.

[0004] Existing silicone rubber production cutting equipment has optimized the level of automation, using a conveyor belt to continuously transport materials, combined with photoelectric sensors to locate the cutting point, and equipped with an electric cutting mechanism to achieve fast and accurate operation. However, in actual use, the above equipment lacks a transport pressing and fixing structure. Due to the lack of this mechanism, the silicone rubber is prone to displacement due to inertia or uneven friction during the process of being transported to the cutting area by the conveyor belt, resulting in sensor positioning failure, cutting position deviating from the predetermined trajectory, and ultimately affecting product quality and raw material utilization. Therefore, a silicone rubber production cutting device is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a silicone rubber cutting device, which aims to solve the technical problem that the silicone rubber trajectory will deviate during the conveyor belt transport to the cutting area in the prior art.

[0006] To achieve the above objectives, the silicone rubber production cutting device provided in this embodiment of the utility model includes a machine body and two connecting plates. Fixing plates are fixedly connected to the front and rear sides of the outer wall of the machine body. Vertical plates are fixedly connected to adjacent sides of multiple fixing plates. Sliding grooves are formed on adjacent sides of two vertical plates. Sliding blocks are fixedly connected to opposite sides of two connecting plates. Fixing holes are formed on opposite sides of two sliding blocks. Engaging strips are slidably connected to the outer walls of the two vertical plates. The outer walls of the engaging strips are fixedly connected to the inner walls of the fixing holes. Pressure roller frames are rotatably connected to adjacent sides of the two connecting plates. A cutting assembly is provided at the top of the outer wall of the machine body. A buffer clamping mechanism is provided at the top of the outer wall of the machine body. The buffer clamping mechanism is used to fix the silicone rubber to be cut.

[0007] As a further description of the above technical solution:

[0008] The buffer clamping mechanism includes two fixed blocks. The top and bottom of the outer walls of the two fixed blocks are fixedly connected to the top of the outer wall of the machine body. An outer rod is fixedly connected to an adjacent side of each of the two fixed blocks. An inner rod is slidably connected to the inner wall of each of the two outer rods. A stop plate is fixedly connected to an adjacent end of each of the two inner rods. A spring is fixedly connected to the outer wall of each inner rod.

[0009] As a further description of the above technical solution:

[0010] The cutting assembly includes a fixed frame, the bottom of the outer wall of the fixed frame is fixedly connected to the top of the outer wall of the machine body, a cylinder is fixedly connected to the top of the outer wall of the fixed frame, and a blade is fixedly connected to the bottom of the outer wall of the cylinder.

[0011] As a further description of the above technical solution:

[0012] An electrical box is fixedly connected to the front side of the outer wall of the fixed frame, and a groove is provided on the front side of the outer wall of the electrical box.

[0013] As a further description of the above technical solution:

[0014] Multiple indicator lights are fixedly connected to the front side of the outer wall of the machine body, and the surfaces of the multiple indicator lights are all rounded.

[0015] As a further description of the above technical solution:

[0016] Multiple heat dissipation slots are fixedly connected to the front side of the outer wall of the machine body, and the multiple heat dissipation slots are arranged at equal intervals.

[0017] As a further description of the above technical solution:

[0018] Support legs are fixedly connected to the four corners of the bottom of the outer wall of the machine body, and silicone pads are fixedly connected to the bottom of the outer wall of each of the support legs.

[0019] As a further description of the above technical solution:

[0020] Two rotating shafts are fixedly connected to the front side of the outer wall of the machine body, and each of the two rotating shafts is rotatably connected to an inspection door.

[0021] Optionally,

[0022] The above-mentioned technical solutions in the silicone rubber production cutting device provided in this embodiment of the utility model have at least one of the following technical effects:

[0023] 1. In this utility model, the manual adjustment operation sliding block slides in the groove to connect the plate to a suitable height, and then fixes it to the corresponding height fixing hole by the snap-fit ​​strip, thereby completing the height adjustment of the lower pressure roller frame. This allows the silicone rubber to be subjected to a certain downward pressure at the top during transportation, improving its stability during transportation and preventing its trajectory from deviating.

[0024] 2. In this utility model, when the silicone rubber moves to the cutting area, the curvature design of the abutment plate and the buffering performance of the spring enable the silicone rubber to achieve an adaptive clamping effect after being in the cutting area, thereby improving the stability of the material during cutting. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A perspective view of a silicone rubber production cutting apparatus provided in an embodiment of this utility model.

[0027] Figure 2 for Figure 1 Enlarged view of point A.

[0028] Figure 3 A front view of the silicone rubber production cutting apparatus provided in an embodiment of this utility model.

[0029] Figure 4 for Figure 3 Enlarged view of point B.

[0030] Figure 5 A side view of a silicone rubber production cutting apparatus provided in an embodiment of this utility model.

[0031] The following are the labeling elements in the figure:

[0032] 1—Main body 2—Buffer clamping mechanism 201—Fixing block 202—Outer rod 203—Spring 204—Suppressor plate 205—Inner rod 3—Fixing plate 4—Vertical plate 5—Slide groove 6—Cylinder 7—Clamping strip 8—Sliding block 9—Fixing hole 10—Connecting plate 11—Pressure roller frame 12—Indicator light 13—Heat dissipation groove 14—Support leg 15—Silicone pad 16—Electrical box 17—Pull groove 18—Rotating shaft 19—Inspection door 20—Fixing frame 21—Blade Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein 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 accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a silicone rubber production cutting device, comprising a body 1 and two connecting plates 10. The body 1 provides structural support and stability, ensuring coordinated operation of all components to achieve precise cutting. Fixing plates 3 are fixedly connected to the front and rear sides of the outer wall of the body 1. Vertical plates 4 are fixedly connected to adjacent sides of multiple fixing plates 3. The fixing plates 3 reinforce the vertical plates 4 and improve their stability. Sliding grooves 5 are provided on adjacent sides of the two vertical plates 4. Sliding blocks 8 are fixedly connected to the opposite sides of the two connecting plates 10. The sliding blocks 8 cooperate with the sliding grooves 5 to adjust the height of the components. Fixing holes 9 are provided on the opposite sides of the two sliding blocks 8 for fixing. Engaging strips 7 are slidably connected to the outer walls of the two vertical plates 4. The engaging strips 7 cooperate with the fixing holes 9, employing an interference fit structure to improve the stability of the fixing. The outer wall of the engaging strips 7 is fixedly connected to the inner wall of the fixing holes 9. The wall has two connecting plates 10, each with a pressure roller frame 11 rotatably connected to one of their adjacent sides. The connecting plates 10 are used to fix and connect roller components. A cutting assembly is provided on the top of the outer wall of the machine body 1. The cutting assembly includes a fixing frame 20. The bottom of the outer wall of the fixing frame 20 is fixedly connected to the top of the outer wall of the machine body 1. A cylinder 6 is fixedly connected to the top of the outer wall of the fixing frame 20. The cylinder 6 provides controllable power to complete the cutting action of silicone rubber, ensuring the stability of cutting force and speed. The fixing frame 20 is used to fix the cutting assembly and improve the stability during cutting. A blade 21 is fixedly connected to the bottom of the outer wall of the cylinder 6. The blade 21 is the core execution component of the cutting assembly. Its sharp edge directly acts on the silicone rubber material to achieve efficient and precise cutting and ensure that the cut is flat and smooth to meet the process requirements. A buffer clamping mechanism 2 is provided on the top of the outer wall of the machine body 1. The buffer clamping mechanism 2 is used to fix the silicone rubber to be cut.

[0038] Specifically, the machine body 1 provides structural support and operational stability for the overall device. It ensures cutting accuracy by coordinating the cooperation of various components. The front and rear outer walls of the machine body 1 are connected to the vertical plates 4 via fixing plates 3. The fixing plates 3 are distributed on the outer walls of the machine body 1 and vertically fixed to the sides of adjacent vertical plates 4, thereby strengthening the structural strength and overall stability of the vertical plates 4. The adjacent side surfaces of the vertical plates 4 are designed with longitudinally extending grooves 5. Sliding blocks 8 are correspondingly installed on the outer walls of the connecting plate 10. The sliding blocks 8 are embedded in the grooves 5 to form a sliding fit. The installation height of the connecting plate 10 is adjusted by vertical displacement. A circular fixing hole 9 is opened on the outer surface of the sliding block 8. The fixing hole 9 and the locking strip 7 form an interference fit. The locking strip 7 slides along the outer wall of the vertical plate 4 and is embedded in the inner wall of the fixing hole 9. The interference structure eliminates gaps to enhance the positioning reliability of the connecting plate 10. The pressure roller frame 11 is connected to the side via a rotating shaft 18. The pressure roller frame 11 can rotate around the shaft to adapt to the conveying path of the silicone rubber material. The cutting assembly consisting of a fixed frame 20 is installed on the top of the machine body 1. The bottom of the fixed frame 20 is rigidly connected to the top of the machine body 1. The top fixed cylinder 6 serves as the power source. The piston rod of the cylinder 6 is equipped with a blade 21. The blade 21 has a sharp cutting edge and its movement trajectory is precisely controlled by the cylinder 6. Through vertical reciprocating motion, a constant pressure and speed are applied to the silicone rubber material to achieve efficient cutting and optimization of the cross-sectional flatness. The fixed frame 20 provides rigid constraints for the cutting process, reducing the impact of vibration on the cutting accuracy. The top of the machine body 1 also integrates a buffer clamping mechanism 2. This mechanism dynamically adjusts the clamping force during the cutting process through the cooperation of elastic elements and clamping surfaces to avoid material slippage or deformation, ensuring the continuity of the cutting action and the quality of the finished product.

[0039] Reference Figure 1 , Figure 3 and Figure 4 The buffer clamping mechanism 2 includes two fixed blocks 201. The top and bottom of the outer walls of the two fixed blocks 201 are fixedly connected to the top of the outer wall of the body 1. The fixed blocks 201 are used to stabilize the mechanism. An outer rod 202 is fixedly connected to the adjacent side of the two fixed blocks 201. An inner rod 205 is slidably connected to the inner wall of the two outer rods 202. The outer rods 202 provide guidance and rigid support, constrain the movement trajectory of the inner rods 205 and prevent lateral displacement. A stop plate 204 is fixedly connected to the adjacent end of the two inner rods 205. The stop plate 204 is used to directly contact the rubber material to complete the clamping. A spring 203 is fixedly connected to the outer wall of the inner rods 205. The spring 203 stores and releases energy through elastic deformation in the device to assist in the buffering of the components.

[0040] Specifically, the fixed blocks 201 provide a stable foundation for the entire mechanism. The adjacent sides of the two fixed blocks 201 are rigidly connected to the outer rod 202. The inner wall of the outer rod 202 is provided with a sliding track, and the inner rod 205 slides along the track. The outer rod 202 provides linear guidance and rigid constraint for the inner rod 205, suppressing its lateral displacement and maintaining the axial consistency of the motion trajectory. The adjacent ends of the two inner rods 205 are fixed with abutment plates 204. The surface of the abutment plates 204 directly contacts and clamps the rubber material, completing the positioning and pressure application of the material. Springs 203 are installed on the outer wall of the inner rods 205. The springs 203 generate elastic deformation through axial compression or tension, store mechanical energy and release it during operation, balance the inertial force of the inner rods 205, assist in the buffering action, and reduce the impact on the mechanism.

[0041] Reference Figure 1 , Figure 3 and Figure 5 An electrical box 16 is fixedly connected to the front of the outer wall of the fixed frame 20. The electrical box 16 serves as the electrical control hub, integrating power distribution, control signal transmission, and safety protection functions, coordinating the equipment's power and logic actions. A groove 17 is provided on the front of the outer wall of the electrical box 16 for easy opening and closing. Multiple indicator lights 12 are fixedly connected to the front of the outer wall of the machine body 1. These lights provide real-time feedback on the equipment's operating status, fault alarms, and operation instructions through different colors or flashing patterns, assisting operators in quickly identifying system conditions and taking corresponding measures. The surfaces of the multiple indicator lights 12 are all rounded. Multiple heat dissipation slots 13 are fixedly connected to the front of the outer wall of the machine body 1, which accelerate the dissipation of heat inside the equipment by optimizing airflow circulation. The operating temperature of key components is kept within a safe range. Multiple heat dissipation slots 13 are arranged at equal intervals. Support legs 14 are fixedly connected to the four corners of the bottom of the outer wall of the body 1, providing a stable foundation support. Silicone pads 15 are fixedly connected to the bottom of the outer wall of multiple support legs 14. They absorb the vibration and impact during equipment operation through elastic deformation, enhance the friction with the ground to prevent slippage, and avoid wear on the ground or equipment structure due to rigid contact, ensuring stable and quiet operation of the equipment. Two rotating shafts 18 are fixedly connected to the front of the outer wall of the body 1, which facilitates the opening and closing of components. Inspection doors 19 are rotatably connected to the outer walls of the two rotating shafts 18, which facilitates maintenance personnel to quickly inspect, replace and debug the core components of the equipment.

[0042] Specifically, the front outer wall of the mounting bracket 20 is rigidly connected to the electrical box 16. The electrical box 16, as the core unit of the equipment's electrical control, integrates a power input / output management module, a control signal logic processing unit, and an overload / short circuit protection device. It achieves automated operation of the equipment by coordinating the timing relationship between the drive signals and the actuators. A groove 17 is provided on the front outer wall of the electrical box 16. The groove 17 optimizes the opening and closing operation of the box door through its groove structure, facilitating internal cable routing and electrical component maintenance. Multiple indicator lights 12 are installed on the front outer wall of the machine body 1. The indicator lights 12 use red, yellow, and green LED light sources, reflecting the equipment's standby, running, and alarm states in real time through color switching and flashing modes, assisting operators in quickly judging the system's operating condition. The indicator light 12's surface uses a curved, rounded corner treatment process to reduce the risk of impact and improve aesthetics. Multiple heat dissipation slots 13 are opened on the front outer wall of the machine body 1. These slots 13 enhance the internal airflow efficiency of the equipment through a horizontally continuous grille structure, accelerating the heat dissipation process of the motor components and control modules, and maintaining the operation of electronic devices. With the temperature within the rated threshold, the heat dissipation slots 13 are evenly distributed longitudinally along the front side of the machine body 1 to ensure a balance between heat dissipation efficiency and structural symmetry. Support legs 14 are vertically installed at the four corners of the bottom of the machine body 1. The support legs 14 have a height fine-tuning function through a threaded adjustment mechanism to adapt to different ground flatness requirements and ensure that the overall level of the equipment meets the operating specifications. Silicone pads 15 are installed at the bottom of the support legs 14. The silicone pads 15 absorb the high-frequency vibration and low-frequency impact energy during equipment operation by utilizing the elasticity of the material. By increasing the friction coefficient of the contact surface, they suppress the tendency of equipment displacement and isolate the direct contact between the rigid support components and the ground, extending the service life of the equipment foundation structure and the ground paving layer. Two rotating shafts 18 are configured on the outer wall of the front side of the machine body 1. The rotating shafts 18 provide rotational freedom for the maintenance door 19, enabling the door to rotate smoothly around the axis. When the maintenance door 19 is closed, it maintains a flat contact with the front side of the machine body 1, maintaining the integrity of the equipment appearance and the sealing of the operating environment. When the maintenance door 19 is open, it forms a maintenance operation window, which facilitates technicians to quickly inspect and adjust the parameters of core components such as the drive module and transmission mechanism.

[0043] Working principle: First, the operator manually adjusts the sliding block 8 to slide along the groove 5, moving the connecting plate 10 to the required process height. Then, the fixing hole 9 on the outer wall of the sliding block 8 and the locking strip 7 on the vertical plate 4 form an interference fit. The locking strip 7 is embedded in the fixing hole 9 to create a locking effect, completing the mechanical locking of the height position of the connecting plate 10. Simultaneously, the rotational connection angle between the pressure roller frame 11 and the connecting plate 10 is adjusted so that the pressure roller frame 11 generates vertical downward pressure when it reaches the preset height with the connecting plate 10. This pressure is continuously applied to the upper surface of the silicone rubber material through the roller, forming a dynamic and stable clamping state. When the material moves along the conveying path, it is constrained by both the downward pressure and the friction of the roller surface, significantly reducing the risk of lateral displacement during the material transportation stage. The precise matching of the height of the pressure roller frame 11 and the force application range achieves a uniform distribution of the contact force on the material surface, preventing the material from deviating from its trajectory due to inertia or external interference, and ensuring the positioning accuracy and process stability of the material before cutting.

[0044] Furthermore, when the silicone rubber is conveyed to the cutting area, the curvature of the abutment plate 204 matches the shape of the silicone rubber contact surface. The elastic compression characteristics of the spring 203 are transmitted to the abutment plate 204 through the inner rod 205, forming an adaptive clamping mechanism. The silicone rubber is guided by the arc surface of the abutment plate 204 to generate a nonlinear contact stress distribution. The spring 203 dynamically adjusts the clamping force according to the material thickness difference, balancing the cutting reaction force and the material rebound tendency. The synergistic effect of the abutment plate 204 and the spring 203 ensures that the silicone rubber is kept under uniform pressure throughout the cutting process, eliminating the risk of displacement caused by local stress concentration, and ensuring that the vertical accuracy of the cutting action of the blade 21 and the cut quality meet the process standards.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A silicone rubber production cutting device, comprising a body (1) and two connecting plates (10), characterized in that: The outer wall of the machine body (1) is fixedly connected to the front and rear sides of the outer wall with fixing plates (3). The adjacent sides of the multiple fixing plates (3) are fixedly connected to vertical plates (4). The adjacent sides of the two vertical plates (4) are provided with sliding grooves (5). The opposite sides of the two connecting plates (10) are fixedly connected to sliding blocks (8). The opposite sides of the two sliding blocks (8) are provided with fixing holes (9). The outer walls of the two vertical plates (4) are slidably connected to locking strips (7). The outer walls of the locking strips (7) are fixedly connected to the inner walls of the fixing holes (9). The adjacent sides of the two connecting plates (10) are rotatably connected to pressure roller frames (11). The top of the outer wall of the machine body (1) is provided with a cutting assembly. The top of the outer wall of the machine body (1) is provided with a buffer clamping mechanism (2). The buffer clamping mechanism (2) is used to fix the silicone rubber to be cut.

2. The silicone rubber production cutting device according to claim 1, characterized in that: The buffer clamping mechanism (2) includes two fixed blocks (201). The top and bottom of the outer walls of the two fixed blocks (201) are fixedly connected to the top of the outer wall of the body (1). An outer rod (202) is fixedly connected to the adjacent side of the two fixed blocks (201). An inner rod (205) is slidably connected to the inner wall of the two outer rods (202). A stop plate (204) is fixedly connected to the adjacent end of the two inner rods (205). A spring (203) is fixedly connected to the outer wall of the inner rod (205).

3. The silicone rubber production cutting device according to claim 1, characterized in that: The cutting assembly includes a fixed frame (20), the bottom of the outer wall of the fixed frame (20) is fixedly connected to the top of the outer wall of the machine body (1), a cylinder (6) is fixedly connected to the top of the outer wall of the fixed frame (20), and a blade (21) is fixedly connected to the bottom of the outer wall of the cylinder (6).

4. The silicone rubber production cutting device according to claim 3, characterized in that: An electrical box (16) is fixedly connected to the front side of the outer wall of the fixed frame (20), and a groove (17) is provided on the front side of the outer wall of the electrical box (16).

5. The silicone rubber production cutting device according to claim 1, characterized in that: Multiple indicator lights (12) are fixedly connected to the front side of the outer wall of the body (1), and the surfaces of the multiple indicator lights (12) are all rounded.

6. The silicone rubber production cutting device according to claim 1, characterized in that: The outer wall of the body (1) is fixedly connected to a number of heat dissipation slots (13), and the heat dissipation slots (13) are arranged at equal intervals.

7. The silicone rubber production cutting device according to claim 1, characterized in that: The outer wall of the body (1) is fixedly connected to a number of heat dissipation slots (13), and the heat dissipation slots (13) are arranged at equal intervals.

8. The silicone rubber production cutting device according to claim 1, characterized in that: Two rotating shafts (18) are fixedly connected to the front side of the outer wall of the body (1), and inspection doors (19) are rotatably connected to the outer walls of the two rotating shafts (18).

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