Mixing machine with hopper cover connecting rod pressing structure

Abstract

The invention discloses a mixing machine with a hopper cover connecting rod pressing structure, and relates to the technical field of mixers.The mixing machine comprises the mixing machine, a cover pressing mechanism is fixedly connected to the top of the mixing machine, a cover pressing plate is movably connected to the bottom of the cover pressing mechanism, and the mixing machine comprises a mixing machine body; the front side and the rear side of the left side and the right side of the top of the mixing machine main body are fixedly connected with connecting rods correspondingly, and the tops of the inner sides of the left group of connecting rods and the right group of connecting rods are fixedly connected with two connecting cross rods correspondingly. Therefore, more stable connection between the hopper cover and the mixing assembly is guaranteed, the mixing effect is improved, and the working efficiency and the mixing quality of the mixer are enhanced, specifically, after a motor is started, a rotating rod rotates and drives a rhombic rotating block to rotate, then an arc-shaped rotating rod is pushed to move, the movement is transmitted to a push-pull plate through a convex plate, and the push-pull plate slides on a sliding groove plate.

Description

Technical Field

[0001] The invention relates to the technical field of mixers, in particular to a mixer with a hopper cover connecting rod pressing structure. Background Art

[0002] In the mixer, the hopper cover is connected to the mixing assembly, and the frame of the mixer can control the hopper containing the material to dock with the hopper cover with the mixing assembly to achieve stirring and mixing of the materials. In the mixer manufactured by the applicant, the mixing assembly includes a stirring shaft, a mixing blade linked to the stirring shaft, and a driving mechanism for driving the stirring shaft to rotate. The driving mechanism is located on the frame, and the upper end of the stirring shaft is usually connected to the driving mechanism, and the lower end of the stirring shaft passes through the hopper cover and is connected to the mixing blade (this part is located inside the hopper after docking);

[0003] According to the patent document: CN221066775U, a mixer disclosed includes a box body, the outer wall of the box body is fixedly connected to a motor, the output end of the motor is fixedly connected to a rotating shaft, one side of the rotating shaft is fixedly connected to a connecting rod 1, the end of the connecting rod 1 away from the rotating shaft is rotatably connected to a transmission gear, the end of the rotating shaft away from the motor is rotatably connected to the connecting shaft, a plurality of groups of fixed rods 1 are fixedly connected to the outer wall of the connecting shaft at equal intervals, a plurality of groups of fixed rods 1 are fixedly connected to the end away from the connecting shaft with a driven gear, a plurality of groups of fixed rods 2 are fixedly connected to the side of the fixed rod 1 away from the driven gear, and the inner side wall of the driven gear meshes with the outer side wall of the transmission gear. The utility model realizes that the rotation shaft is driven by the operation of the motor, and the mortar is stirred and mixed by the rotation of the stirring blade, and at the same time, the scraper can peel and stir the mortar on the inner wall of the box body, thereby improving the efficiency of mortar mixing and avoiding the accumulation of mortar on the inner wall, which affects the stirring function of the stirring blade.

[0004] When the mixer is started, there will often be a certain degree of shaking. This shaking may affect the hopper cover, making the connection between it and the mixing component less stable during the shaking process. This unstable connection may further affect the mixing effect, thereby reducing the working efficiency and mixing quality of the mixer. Summary of the invention

[0005] The object of the present invention is to provide a mixer with a hopper cover connecting rod clamping structure to solve the problem that the mixer proposed in the prior art often shakes to a certain extent at the moment of startup, and this shaking may affect the hopper cover, making the connection between it and the mixing component less stable during the shaking process. This unstable connection may further affect the mixing effect, thereby reducing the working efficiency and mixing quality of the mixer.

[0006] To achieve the above object, the present invention provides the following technical solution: a mixer with a hopper cover connecting rod pressing structure, comprising a mixer, a top of the mixer is fixedly connected to a cover pressing mechanism, and a bottom of the cover pressing mechanism is movably connected to a cover pressing plate;

[0007] The mixer comprises a mixer body, the front and rear sides of the left and right sides of the top of the mixer body are respectively fixedly connected with connecting rods, and the inner tops of the left and right groups of connecting rods are both fixedly connected with two connecting cross bars;

[0008] The capping mechanism comprises a capping mechanism body, and a control board is fixedly connected to the top of the capping mechanism body.

[0009] Preferably, the main body of the cover pressing mechanism includes four vertical rods, the outer sides of the left and right groups of vertical rods are respectively fixedly connected to the inner sides of the two groups of connecting rods, the inner bottoms of the front and rear groups of vertical rods are fixedly connected to the slide plate connecting rods, and the inner sides of the front and rear groups of slide plate connecting rods are fixedly connected to the slide plates.

[0010] Preferably, the inner walls of the two slide groove plates are slidably connected to sliders, the outer walls of the two sliders are rotatably connected to rotating rods, the outer sides of the two sliders are fixedly connected to push-pull plates, and the inner tops of the two push-pull plates are fixedly connected to convex plates.

[0011] Preferably, the two rotating rods are rotatably connected to a top plate on one side away from the slider, the bottom of the top plate is fixedly connected to a lower pressure plate connecting column, the bottom of the lower pressure plate connecting column is fixedly connected to the lower pressure plate, and hinge grooves are respectively provided on the front and rear sides of the left and right sides of the lower pressure plate.

[0012] Preferably, the control board includes a control board body, a motor placement compartment is fixedly connected to the middle of the bottom of the control board body, a motor is fixedly connected to the inner wall of the motor placement compartment, and the output end of the motor extends to the top of the outer wall of the control board body.

[0013] Preferably, the output end of the motor is fixedly connected to a rotating rod, the top of the rotating rod is fixedly connected to a diamond-shaped rotating block, the left and right sides of the top of the diamond-shaped rotating block are respectively rotatably connected to arc-shaped rotating rods, and the bottom of the two arc-shaped rotating rods are respectively rotatably connected to the tops of the two convex plates on one side away from the diamond-shaped rotating block.

[0014] Preferably, the pressure cover plate comprises a pressure cover plate body, the top four sides of which are rotatably connected to hinged rods respectively, and the left and right groups of hinged rods are rotatably connected to rotating blocks on one side away from the pressure cover plate body.

[0015] Preferably, the outer walls of the left and right groups of rotating blocks are both rotatably connected to the inner walls of the hinge grooves formed in the lower pressing plate.

[0016] Preferably, the left and right groups of the rotating blocks are both rotatably connected to the second hinged rod on one side away from the hinged rod, and the left and right groups of the second hinged rods are both rotatably connected to the spring connecting block on the inner wall on one side away from the rotating block.

[0017] Preferably, the inner sides of the left and right groups of spring connecting blocks are fixedly connected with springs, and the inner sides of the left and right groups of springs are respectively fixedly connected to the left and right tops of the lower pressure plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present application is provided with a capping mechanism, a capping mechanism body and a control panel, which can effectively reduce the shaking phenomenon when the mixer is started, thereby ensuring that the connection between the hopper cover and the mixing assembly is more stable, improving the mixing effect, and enhancing the working efficiency and mixing quality of the mixer. Specifically, after starting the motor, the rotating rod rotates and drives the diamond-shaped rotating block to rotate, thereby pushing the arc-shaped rotating rod to move. This movement is transmitted to the push-pull plate through the convex plate, so that it slides on the slide plate, driving the slider and the rotating rod to realize the lowering of the top plate. The top plate applies pressure to the hopper cover through the lower pressure plate to complete the clamping. The control panel monitors the entire process, receives sensor signals to ensure that the applied force reaches the preset value, and automatically adjusts the motor speed to achieve the desired clamping effect.

[0020] 2. The present application effectively alleviates the impact force generated by the pressing mechanism during the process of pressing the hopper cover by providing a pressing cover plate, and the pressing cover plate can automatically adjust the applied pressure according to the actual thickness of the hopper cover. The pressing cover plate can adapt to hopper covers of different thicknesses more accurately to ensure that the applied pressure is always in an optimal state. Specifically, when the pressing plate starts to press down the hopper cover, the pressing cover plate contacts the hopper cover through the main body, and uses the hinged rod and the rotating block to evenly apply pressure to avoid deformation or damage. The system automatically adjusts the pressure through the second hinged rod and the spring connecting block to adapt to hopper covers of different thicknesses to ensure the optimal pressure state. The spring provides rebound force to maintain stability and quickly reset to improve efficiency. The elastic force of the spring can be adjusted as needed to adapt to different thicknesses to ensure that the applied pressure is always optimal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the main body three-dimensional structure of a mixer with a hopper cover connecting rod pressing structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the main body three-dimensional separation structure of a mixer with a hopper cover connecting rod pressing structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of a mixer body of a mixer with a hopper cover connecting rod pressing structure according to the present invention;

[0024] Figure 4 It is a schematic diagram of a three-dimensional separation structure of a cover pressing mechanism and a cover pressing plate of a mixer having a hopper cover connecting rod pressing structure according to the present invention;

[0025] Figure 5 It is a schematic diagram of a three-dimensional separation structure of a cover pressing mechanism of a mixer with a hopper cover connecting rod pressing structure according to the present invention;

[0026] Figure 6 It is a schematic diagram of the main body of the three-dimensional structure of the cover pressing mechanism of a mixer with a hopper cover connecting rod pressing structure according to the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of a control panel of a mixer with a hopper cover connecting rod pressing structure according to the present invention;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of a cover pressing plate of a mixer with a hopper cover connecting rod pressing structure according to the present invention.

[0029] Numbers in the figure: 1, mixer; 11, mixer body; 12, connecting rod; 13, connecting cross bar; 2, cover mechanism; 21, cover mechanism body; 211, vertical rod; 212, top plate; 213, slide plate connecting rod; 214, slide plate; 215, slider; 216, push-pull plate; 217, convex plate; 218, rotating rod; 219, lower pressure plate; 2110, hinge groove; 2111, lower pressure plate connecting column; 22, control board; 221, control board body; 222, motor placement bin; 223, motor; 224, rotating rod; 225, diamond-shaped rotating block; 226, arc-shaped rotating rod; 3, cover plate; 31, cover plate body; 32, hinged rod; 33, rotating block; 34, second hinged rod; 35, spring connecting block; 36, spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example: Figure 1-Figure 4 As shown, the present invention provides a technical solution of a mixer with a hopper cover connecting rod pressing structure, including a mixer 1, a top of the mixer 1 is fixedly connected to a cover pressing mechanism 2, and the bottom of the cover pressing mechanism 2 is movably connected to a cover pressing plate 3.

[0032] See also Figure 5-7The mixer 1 comprises a mixer body 11, and the front and rear sides of the left and right sides of the top of the mixer body 11 are respectively fixedly connected with connecting rods 12, and the inner tops of the left and right groups of connecting rods 12 are fixedly connected with two connecting cross bars 13. The capping mechanism 2 comprises a capping mechanism body 21, and the top of the capping mechanism body 21 is fixedly connected with a control board 22. The capping mechanism body 21 comprises four vertical rods 211, and the outer sides of the left and right groups of vertical rods 211 are respectively fixedly connected to the inner sides of the two groups of connecting rods 12, and the inner bottoms of the front and rear groups of vertical rods 211 are fixedly connected with a slide plate connecting rod 213, and the inner sides of the front and rear groups of slide plate connecting rods 213 are fixedly connected with a slide plate 214, and the inner walls of the two slide plates 214 are slidably connected with sliders 215, and the outer walls of the two sliders 215 are rotatably connected with rotating rods 218, and the outer sides of the two sliders 215 are fixedly connected with push-pull plates 216, and the inner tops of the two push-pull plates 216 are fixedly connected with convex plates 2 17, the two rotating rods 218 are rotatably connected to the top plate 212 on one side away from the slider 215, the bottom of the top plate 212 is fixedly connected to the lower pressure plate connecting column 2111, the bottom of the lower pressure plate connecting column 2111 is fixedly connected to the lower pressure plate 219, and the front and rear sides of the left and right sides of the lower pressure plate 219 are respectively provided with hinge grooves 2110, the control board 22 includes a control board body 221, the bottom middle part of the control board body 221 is fixedly connected to a motor placement bin 222, the inner wall of the motor placement bin 222 is fixedly connected to a motor 223, the output end of the motor 223 extends to the top of the outer wall of the control board body 221, the output end of the motor 223 is fixedly connected to a rotating rod 224, the top of the rotating rod 224 is fixedly connected to a diamond-shaped rotating block 225, the left and right sides of the top of the diamond-shaped rotating block 225 are respectively rotatably connected to arc-shaped rotating rods 226, and the bottom of the two arc-shaped rotating rods 226 is rotatably connected to the tops of the two convex plates 217 on one side away from the diamond-shaped rotating block 225.

[0033] When the hopper cover is pressed, the motor 223 needs to be started first. After the motor 223 is started, its rotational motion is transmitted to the rotating rod 224, so that the rotating rod 224 starts to rotate. The rotation of the rotating rod 224 further drives the rhombus rotating block 225 connected thereto to rotate. Since there is a connection relationship between the rhombus rotating block 225 and the two arc-shaped rotating rods 226, when the rhombus rotating block 225 rotates, it pushes the two arc-shaped rotating rods 226 to move along their respective rotation axes. This movement transmits force to the push-pull plate 216 through the convex plate 217, so that the push-pull plate 216 slides along the chute plate 214. The sliding of the push-pull plate 216 drives the slider 215 to move along the chute plate 214. When the slider 215 moves on the chute plate 214, it drives the rotating rod 218 to rotate, and pulls the top plate 212 downward through the rotating rod 218. In this way, the descending action of the top plate 212 is realized. The top plate 212 is connected to the lower pressing plate 219 through the lower pressing plate connecting column 2111. Therefore, the descent of the top plate 212 will cause the lower pressing plate 219 to apply pressure to the hopper cover, thereby achieving the compression of the hopper cover. The entire compression process is controlled by the control panel 22, ensuring the accuracy and reliability of the compression action;

[0034] The control panel 22 monitors the entire clamping process by receiving signals from the sensor. The sensor can detect the position and pressure of the top plate 212 to ensure that the force applied by the lower pressure plate 219 to the hopper cover reaches the preset clamping force. If insufficient or excessive pressure is detected, the control panel 22 will automatically adjust the speed of the motor 223, thereby changing the speed of the rotating rod 224 to achieve the desired clamping effect. The entire system is designed to improve work efficiency while ensuring the safety and reliability of operation.

[0035] See also Figure 8 The pressure cover plate 3 includes a pressure cover plate body 31, and the top four sides of the pressure cover plate body 31 are rotatably connected with hinge rods 32 respectively, and the left and right groups of hinge rods 32 are rotatably connected to the side away from the pressure cover plate body 31. The outer walls of the left and right groups of rotating blocks 33 are rotatably connected to the inner wall of the hinge groove 2110 opened in the lower pressure plate 219, and the left and right groups of rotating blocks 33 are rotatably connected to the side away from the hinge rod 32. The left and right groups of second hinge rods 34 are rotatably connected to the inner wall of the side away from the rotating block 33. The left and right groups of spring connecting blocks 35 are fixedly connected to the inner sides of the spring connecting blocks 35. The inner sides of the left and right groups of spring 36 are fixedly connected to the left and right tops of the lower pressure plate 219 respectively;

[0036] When the lower pressing plate 219 starts to press down the hopper cover, it will first directly contact the hopper cover through the cover pressing plate body 31, and then, through the clever cooperation of the hinge rod 32 and the rotating block 33, the cover pressing plate 3 can apply pressure on the hopper cover in a uniform manner. This design ensures uniform distribution of pressure, thereby avoiding the problem of deformation or damage of the hopper cover caused by uneven pressure;

[0037] In order to further enhance the stability and adaptability of the system, the designer added a second hinge rod 34 and a spring connection block 35 to the structure. This arrangement enables the cover plate 3 to automatically adjust the applied pressure according to the actual thickness of the hopper cover during the process of the lower pressure plate 219 applying pressure. In this way, the cover plate 3 can more accurately adapt to hopper covers of different thicknesses, ensuring that the applied pressure is always in the best state.

[0038] In addition, the presence of the spring 36 provides the necessary resilience for the entire system, which not only helps to maintain the stability of the gland plate 3 when pressure is applied, but also can quickly return to its original position after the pressure is released, thereby improving work efficiency. More importantly, the elastic force of the spring 36 can be adjusted according to actual needs to adapt to hopper covers of different thicknesses, thereby ensuring that the pressure applied by the gland plate 3 to the hopper cover is always in an optimal state;

[0039] In summary, the design of the entire clamping structure not only ensures the uniformity of the pressure cover, but also improves the working efficiency and reliability of the mixer. Through this carefully designed mechanical structure, it can ensure that the hopper cover is subjected to uniform pressure while avoiding deformation or damage caused by uneven pressure, thereby improving the performance and service life of the entire mixer.

[0040] Working principle: When the hopper cover is pressed, the motor 223 needs to be started first. After the motor 223 is started, its rotational motion is transmitted to the rotating rod 224, so that the rotating rod 224 starts to rotate. The rotation of the rotating rod 224 further drives the rhombus rotating block 225 connected thereto to rotate. Since there is a connection relationship between the rhombus rotating block 225 and the two arc-shaped rotating rods 226, when the rhombus rotating block 225 rotates, it pushes the two arc-shaped rotating rods 226 to move along their respective rotation axes. This movement transmits force to the push-pull plate 216 through the convex plate 217, so that the push-pull plate 216 slides along the chute plate 214. The sliding of the push-pull plate 216 drives the slider 215 to move along the chute plate 214. When the slider 215 moves on the chute plate 214, it drives the rotating rod 218 to rotate, and pulls the top plate 212 downward through the rotating rod 218. In this way, the descending action of the top plate 212 is realized. The top plate 212 is connected to the lower pressing plate 219 through the lower pressing plate connecting column 2111. Therefore, the descent of the top plate 212 will cause the lower pressing plate 219 to apply pressure to the hopper cover, thereby achieving the compression of the hopper cover. The entire compression process is controlled by the control panel 22 to ensure the accuracy and reliability of the compression action. The control panel 22 monitors the entire compression process by receiving signals from the sensor. The sensor can detect the position and pressure of the top plate 212 to ensure that the force applied by the lower pressing plate 219 to the hopper cover reaches the preset compression force. If insufficient or excessive pressure is detected, the control panel 22 will automatically adjust the speed of the motor 223, thereby changing the speed of the rotating rod 224 to achieve the desired compression effect;

[0041] When the lower pressing plate 219 starts to press the hopper cover, it will first directly contact the hopper cover through the pressing plate body 31, and then, through the clever cooperation of the hinge rod 32 and the rotating block 33, the pressing plate 3 can apply pressure on the hopper cover in a uniform manner. This design ensures the uniform distribution of pressure, thereby avoiding the problem of deformation or damage of the hopper cover caused by uneven pressure. In order to further enhance the stability and adaptability of the system, the designer added a second hinge rod 34 and a spring connecting block 35 to the structure. This arrangement enables the pressing plate 3 to be in the process of applying pressure by the lower pressing plate 219. The applied pressure is automatically adjusted according to the actual thickness of the hopper cover. In this way, the cover plate 3 can adapt to hopper covers of different thicknesses more accurately, ensuring that the applied pressure is always in an optimal state. In addition, the presence of the spring 36 provides the entire system with necessary resilience, which not only helps to maintain the stability of the cover plate 3 when pressure is applied, but also can quickly return to its original position after the pressure is released, thereby improving work efficiency. More importantly, the elastic force of the spring 36 can be adjusted according to actual needs to adapt to hopper covers of different thicknesses, thereby ensuring that the pressure applied by the cover plate 3 to the hopper cover is always in an optimal state.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A mixer with a hopper cover connecting rod pressing structure, characterized in that: It comprises a mixer (1), the top of the mixer (1) is fixedly connected to a capping mechanism (2), and the bottom of the capping mechanism (2) is movably connected to a capping plate (3); The mixer (1) comprises a mixer body (11), the front and rear sides of the left and right sides of the top of the mixer body (11) are respectively fixedly connected with connecting rods (12), and the inner tops of the left and right groups of the connecting rods (12) are both fixedly connected with two connecting cross bars (13); The capping mechanism (2) comprises a capping mechanism main body (21), and a control panel (22) is fixedly connected to the top of the capping mechanism main body (21).

2. A mixer with a hopper cover connecting rod pressing structure according to claim 1, characterized in that: The cover pressing mechanism body (21) comprises four vertical rods (211), the outer sides of the left and right vertical rods (211) are respectively fixedly connected to the inner sides of the two groups of connecting rods (12), the inner bottoms of the front and rear vertical rods (211) are fixedly connected to the slide plate connecting rods (213), and the inner sides of the front and rear slide plate connecting rods (213) are fixedly connected to the slide plates (214).

3. A mixer with a hopper cover connecting rod pressing structure according to claim 2, characterized in that: The inner walls of the two slide groove plates (214) are slidably connected to sliders (215), the outer walls of the two sliders (215) are rotatably connected to rotating rods (218), the outer sides of the two sliders (215) are fixedly connected to push-pull plates (216), and the inner tops of the two push-pull plates (216) are fixedly connected to convex plates (217).

4. A mixer with a hopper cover connecting rod pressing structure according to claim 3, characterized in that: The two rotating rods (218) are rotatably connected to a top plate (212) at one side away from the slider (215); the bottom of the top plate (212) is fixedly connected to a lower pressure plate connecting column (2111); the bottom of the lower pressure plate connecting column (2111) is fixedly connected to a lower pressure plate (219); and hinge grooves (2110) are respectively provided on the front and rear sides of the left and right sides of the lower pressure plate (219).

5. The mixer with a hopper cover connecting rod pressing structure according to claim 1, characterized in that: The control panel (22) comprises a control panel body (221), a motor placement compartment (222) is fixedly connected to the middle of the bottom of the control panel body (221), a motor (223) is fixedly connected to the inner wall of the motor placement compartment (222), and an output end of the motor (223) extends to the top of the outer wall of the control panel body (221).

6. A mixer with a hopper cover connecting rod pressing structure according to claim 5, characterized in that: The output end of the motor (223) is fixedly connected to a rotating rod (224), the top of the rotating rod (224) is fixedly connected to a diamond-shaped rotating block (225), the left and right sides of the top of the diamond-shaped rotating block (225) are respectively rotatably connected to arc-shaped rotating rods (226), and the bottoms of the two arc-shaped rotating rods (226) are respectively rotatably connected to the tops of the two convex plates (217) on the sides away from the diamond-shaped rotating block (225).

7. The mixer with a hopper cover connecting rod pressing structure according to claim 1, characterized in that: The pressure cover plate (3) comprises a pressure cover plate body (31), the top four sides of which are rotatably connected to hinge rods (32), and the left and right sets of hinge rods (32) are rotatably connected to a rotating block (33) on the side away from the pressure cover plate body (31).

8. The mixer with a hopper cover connecting rod pressing structure according to claim 7, characterized in that: The outer walls of the left and right groups of rotating blocks (33) are both rotatably connected to the inner wall of the hinge groove (2110) opened on the lower pressing plate (219).

9. The mixer with a hopper cover connecting rod pressing structure according to claim 7, characterized in that: The left and right sets of the rotating blocks (33) are both rotatably connected to the second hinged rod (34) on one side away from the hinged rod (32), and the left and right sets of the second hinged rod (34) are both rotatably connected to the inner wall of the side away from the rotating blocks (33) on the other side.

10. The mixer with a hopper cover connecting rod pressing structure according to claim 9, characterized in that: The inner sides of the two groups of spring connection blocks (35) are fixedly connected with springs (36), and the inner sides of the two groups of springs (36) are fixedly connected to the tops of the left and right sides of the lower pressure plate (219) respectively.

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