A modified plastic processing granulator

Abstract

The present invention relates to the technical field of plastic processing and granulation, and discloses a modified plastic processing and granulating machine, including a main body component, including a screw extruder, a support column, a mixing barrel, a cover plate and a discharge port, wherein the support column is fixed to the top of the screw extruder, the mixing barrel is fixed to one side of the support column, the cover plate is located at the top of the mixing barrel, and the discharge port is arranged below the mixing barrel; a discharge component is arranged on the screw extruder, and includes a detection part, a driving part, a rotating part, a connecting part, a fixed plate, a baffle, a threaded strip and a rotating ring, and the detection part is arranged in the screw extruder. The beneficial effect of the present invention is that the feed port pressure of the screw extruder can be stabilized by arranging the discharge component, thereby realizing efficient and stable operation of the modified plastic processing and granulating machine.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing and granulation, in particular to a modified plastic processing and granulation machine. Background Art

[0002] In the plastic processing industry, modified plastics are widely used due to their excellent physical properties, chemical stability and processing performance. As a key equipment, modified plastic processing granulators play an important role in mixing basic plastics with various additives (such as calcium carbonate, rubber oil, etc.) and modifying them to finally prepare granular products. However, existing modified plastic processing granulators generally face certain technical challenges in the raw material feeding link.

[0003] Specifically, before adding the evenly mixed raw materials into the extruder, the traditional modified plastic processing granulator often adopts the direct feeding method, that is, the outlet of the mixing barrel is directly aligned with the feed port of the extruder. Although this method is simple and direct, it has significant disadvantages: as the amount of material in the mixing barrel decreases, the pressure on the feed port of the extruder will change significantly. Initially, due to sufficient material, the pressure on the feed port is relatively large; and as the material decreases, the pressure gradually decreases. This pressure instability has many adverse effects on the extrusion process and product quality. First, the instability of the feed pressure leads to fluctuations in the melt flow rate during the extrusion process, which in turn affects the dimensional accuracy and appearance quality of the product. For example, problems such as uneven product thickness and uneven surface may occur, reducing the market competitiveness of the product. Secondly, pressure fluctuations may also threaten the stable operation of the extruder. Sudden pressure changes may cause fluctuations in the speed of the extruder screw, and in severe cases may even cause shutdowns or failures, affecting production efficiency and equipment life. Summary of the invention

[0004] In view of the above problems existing in the existing modified plastic processing granulator, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the feed pressure of the modified plastic processing granulator is unstable in the raw material feeding link.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a modified plastic processing granulator, comprising a main body assembly, including a screw extruder, a support column, a mixing barrel, a cover plate and a discharge port, wherein the support column is fixed to the top of the screw extruder, the mixing barrel is fixed to one side of the support column, the cover plate is located at the top of the mixing barrel, and the discharge port is arranged below the mixing barrel;

[0007] A discharging assembly is arranged on the screw extruder, and includes a detection member, a driving member, a rotating member, a connecting member, a fixed plate, a baffle, a threaded strip and a rotating ring. The detection member is arranged in the screw extruder, the driving member is located at the top of the screw extruder, the rotating member is located in the driving member, the connecting member is arranged in the rotating member, the fixed plate is fixed in the discharging port, the baffle is located above the fixed plate, the threaded strip is fixed to the top of the baffle, and the rotating ring is fixed to the end of the threaded strip.

[0008] As a preferred solution of the modified plastic processing granulator described in the present invention, the detection component includes a support shaft, a detection plate, a first spring and a limit block, the support shaft is rotatably connected to the screw extruder, the detection plate is rotatably connected to the surface of the support shaft, the two ends of the first spring are respectively fixed to the inner wall of the detection plate and the inner wall of the screw extruder, and the limit block is fixed to one side of the detection plate.

[0009] As a preferred solution of the modified plastic processing granulator described in the present invention, the driving component includes a driving motor, a first pulley, a protective shell and a second pulley, the driving motor is fixed to the top of the screw extruder, the first pulley is fixed to the output end of the driving motor, the protective shell is fixed to the top of the driving motor, and the second pulley is rotatably connected to the protective shell.

[0010] As a preferred solution of the modified plastic processing granulator described in the present invention, the rotating part includes a support rod, a support cap and a rotating shaft, the support rod is fixed to the inner wall of the discharge port, the support cap is fixed to the end of the support rod, the rotating shaft is rotatably connected to the support cap, and the second pulley is fixed to the surface of the rotating shaft.

[0011] As a preferred solution of the modified plastic processing granulator described in the present invention, the connecting member includes a connecting disk, the connecting disk is fixed to the bottom of the fixed plate, the rotating shaft is rotatably connected in the connecting disk, and the protective shell is fixed to the bottom of the connecting disk.

[0012] As a preferred solution of the modified plastic processing granulator described in the present invention, the connecting piece also includes an extrusion sleeve, an extrusion ring and a second spring, the extrusion sleeve slides in the rotating shaft, the extrusion ring is fixed to the surface of the extrusion sleeve, and the two ends of the second spring are respectively fixed to the top of the extrusion ring and the inner wall of the rotating shaft.

[0013] As a preferred solution of the modified plastic processing granulator described in the present invention, the connecting piece further includes an extrusion rod and a third spring, the extrusion rod slides in the extrusion sleeve, and the two ends of the third spring are respectively fixed to the end of the extrusion rod and the inner wall of the extrusion sleeve.

[0014] As a preferred solution of the modified plastic processing granulator described in the present invention, the connecting part also includes a driving plate, a push rod, a positioning rod, a positioning sleeve, a fourth spring and a positioning column. The driving plate slides in the rotating shaft, the push rod is fixed to one side of the driving plate, the positioning rod slides in the baffle, the positioning sleeve slides in the discharge port, the two ends of the fourth spring are respectively fixed to the inner wall of the positioning sleeve and the inner wall of the discharge port, and the positioning column is fixed to one side of the positioning sleeve.

[0015] As a preferred solution of the modified plastic processing granulator described in the present invention, the connecting part also includes a support block, a rocker arm, a first support sleeve, a second support sleeve and a cable, the support block is fixed to the bottom of the protective shell, the rocker arm is hinged to the surface of the support block, the first support sleeve is fixed to the bottom of the protective shell, the second support sleeve is fixed to the top of the screw extruder, and the two ends of the cable are respectively fixed to the end of the rocker arm and the top of the detection plate.

[0016] The beneficial effect of the present invention is that the pressure at the feed port of the screw extruder can be stabilized by arranging the discharge assembly, thereby realizing efficient and stable operation of the modified plastic processing granulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 This is the structural diagram of the modified plastic processing granulator.

[0019] Figure 2 This is a cross-sectional structural diagram of the rotating shaft of a modified plastic processing granulator.

[0020] Figure 3 For modified plastic processing granulator Figure 2 A magnified view of the local structure at point A.

[0021] Figure 4 For modified plastic processing granulator Figure 2 Enlarged view of the local structure at point B in the middle.

[0022] Figure 5 This is the connection structure diagram of the limit block and detection plate of the modified plastic processing granulator.

[0023] Figure 6 This is a cross-sectional structural diagram of the positioning sleeve of a modified plastic processing granulator.

[0024] Figure 7 This is the structural diagram of the rotating parts of the modified plastic processing granulator.

[0025] Figure 8 For modified plastic processing granulator Figure 7 Enlarged view of the local structure at point C in the middle. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1, reference Figures 1 to 8 , which is the first embodiment of the present invention, provides a modified plastic processing granulator, which includes a main body component 100 and a discharge component 200. Through the cooperation of the two, the feed port pressure of the screw extruder 101 can be stabilized, thereby realizing efficient and stable operation of the modified plastic processing granulator.

[0030] Specifically, the main component 100 includes a screw extruder 101, a support column 102, a mixing barrel 103, a cover plate 104 and a discharge port 105. The support column 102 is fixed to the top of the screw extruder 101, the mixing barrel 103 is fixed to one side of the support column 102, the cover plate 104 is located at the top of the mixing barrel 103, and the discharge port 105 is arranged below the mixing barrel 103.

[0031] The screw extruder 101 is a prior art, which is used to melt the mixture and extrude it into plastic strips. The support column 102 is used to support the mixing barrel 103. The mixing barrel 103 is a prior art. The mixing barrel 103 has an automatic stirring mechanism, which can mix the basic plastic added to the mixing barrel 103 with various additives. The cover plate 104 is used to seal the top of the mixing barrel 103. The discharge port 105 is used to discharge the mixed material in the mixing barrel 103. The discharge port 105 is located directly above the feed port of the screw extruder 101.

[0032] The discharge assembly 200 is arranged on the screw extruder 101, and includes a detection member 201, a driving member 202, a rotating member 203, a connecting member 204, a fixed plate 205, a baffle 206, a threaded bar 207 and a rotating ring 208. The detection member 201 is arranged in the screw extruder 101, the driving member 202 is located at the top of the screw extruder 101, the rotating member 203 is located in the driving member 202, the connecting member 204 is arranged in the rotating member 203, the fixed plate 205 is fixed in the discharge port 105, the baffle 206 is located above the fixed plate 205, the threaded bar 207 is fixed to the top of the baffle 206, and the rotating ring 208 is fixed to the end of the threaded bar 207.

[0033] The detection member 201 is used to detect the amount of material in the feed port of the screw extruder 101. When the amount of material in the feed port of the screw extruder 101 is higher or lower than a threshold value, the detection member 201 can enable the driving member 202 to drive the rotating member 203 to drive the baffle 206 to rotate or stop through the connecting member 204, so that the discharge port 105 can discharge material when the screw extruder 101 needs it, thereby preventing the feed port of the screw extruder 101 from being subjected to greater pressure. When the baffle 206 rotates, it can drive the threaded strip 207 and the rotating ring 208 to rotate synchronously, so that the threaded strip 207 drives the mixed material in the discharge port 105 to discharge the material, thereby preventing the mixed material from being blocked in the discharge port 105.

[0034] Specifically, the detection member 201 includes a support shaft 201a, a detection plate 201b, a first spring 201c and a limit block 201d. The support shaft 201a is rotatably connected to the screw extruder 101, the detection plate 201b is rotatably connected to the surface of the support shaft 201a, the two ends of the first spring 201c are respectively fixed to the inner wall of the detection plate 201b and the inner wall of the screw extruder 101, and the limit block 201d is fixed to one side of the detection plate 201b.

[0035] The first spring 201c is in a compressed state. The limiting action of the limiting block 201d can prevent the top of the detection plate 201b from completely moving out of the screw extruder 101. When the mixture is continuously added to the feed port of the screw extruder 101, as the mixture increases, the mixture will gradually increase the extrusion force on the detection plate 201b. When the amount of the mixture reaches the top of the detection plate 201b, the detection plate 201b will be completely squeezed into the screw extruder 101. When a part of the mixture in the screw extruder 101 is used, the detection plate 201b can be extended out of the feed bin of the screw extruder 101 under the action of the reset elastic force of the first spring 201c. The reciprocating movement of the detection plate 201b can also prevent the mixture from being blocked in the feed bin of the screw extruder 101.

[0036] Specifically, the driving member 202 includes a driving motor 202a, a first pulley 202b, a protective shell 202c and a second pulley 202d. The driving motor 202a is fixed to the top of the screw extruder 101, the first pulley 202b is fixed to the output end of the driving motor 202a, the protective shell 202c is fixed to the top of the driving motor 202a, and the second pulley 202d is rotatably connected to the protective shell 202c.

[0037] The driving motor 202a is used to drive the first pulley 202b to rotate. The first pulley 202b and the second pulley 202d are connected by a belt, so that the first pulley 202b can drive the second pulley 202d to rotate. The protective shell 202c is used to protect the belt to prevent the mixture from adhering to the belt surface.

[0038] Specifically, the rotating member 203 includes a support rod 203a, a support cap 203b and a rotating shaft 203c. The support rod 203a is fixed to the inner wall of the discharge port 105, the support cap 203b is fixed to the end of the support rod 203a, the rotating shaft 203c is rotatably connected to the support cap 203b, and the second pulley 202d is fixed to the surface of the rotating shaft 203c.

[0039] The support rod 203a is used to support the support cap 203b, so that the support cap 203b can effectively support the rotating shaft 203c, so that the rotating shaft 203c can rotate stably. When the second pulley 202d rotates, it can drive the rotating shaft 203c to rotate.

[0040] Example 2, reference Figures 1 to 8 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0041] Specifically, the connecting member 204 includes a connecting disk 204a, the connecting disk 204a is fixed to the bottom of the fixing plate 205, the rotating shaft 203c is rotatably connected in the connecting disk 204a, and the protective shell 202c is fixed to the bottom of the connecting disk 204a.

[0042] The connecting disk 204a is used to fix and support the protective shell 202c. At the same time, the connecting disk 204a can provide limited support for the rotating shaft 203c, so that the rotating shaft 203c can rotate stably.

[0043] Specifically, the connecting member 204 also includes an extrusion sleeve 204b, an extrusion ring 204c and a second spring 204d. The extrusion sleeve 204b slides in the rotating shaft 203c, the extrusion ring 204c is fixed to the surface of the extrusion sleeve 204b, and the two ends of the second spring 204d are respectively fixed to the top of the extrusion ring 204c and the inner wall of the rotating shaft 203c.

[0044] The second spring 204d is in a compressed state, and the extrusion ring 204c can be compressed by the second spring 204d. By pushing the extrusion sleeve 204b, the extrusion sleeve 204b can drive the extrusion ring 204c to further compress the second spring 204d.

[0045] Specifically, the connecting member 204 further includes an extrusion rod 204e and a third spring 204f. The extrusion rod 204e slides in the extrusion sleeve 204b. Two ends of the third spring 204f are respectively fixed to the end of the extrusion rod 204e and the inner wall of the extrusion sleeve 204b.

[0046] The third spring 204f is in a compressed state. By squeezing the squeezing rod 204e, the squeezing rod 204e can push the squeezing sleeve 204b through the third spring 204f.

[0047] Specifically, the connecting member 204 also includes a driving plate 204g, a push rod 204h, a positioning rod 204i, a positioning sleeve 204j, a fourth spring 204k and a positioning column 204l. The driving plate 204g slides in the rotating shaft 203c, the push rod 204h is fixed to one side of the driving plate 204g, the positioning rod 204i slides in the baffle 206, the positioning sleeve 204j slides in the discharge port 105, the two ends of the fourth spring 204k are respectively fixed to the inner wall of the positioning sleeve 204j and the inner wall of the discharge port 105, and the positioning column 204l is fixed to one side of the positioning sleeve 204j.

[0048] The fourth spring 204k is in a compressed state. The positioning column 204l is set to prevent the positioning sleeve 204j from sliding out of the discharge port 105. There are two drive plates 204g, and an extrusion groove is set on the adjacent side of the two drive plates 204g. The extrusion sleeve 204b is used to squeeze the extrusion grooves of the two drive plates 204g, so that the two drive plates 204g can move away from each other, so that the two drive plates 204g can squeeze the positioning rod 204i through the two push rods 204h respectively. As the baffle 206 rotates, when the positioning rod 204i moves to one side of the positioning sleeve 204j, the positioning rod 204i will squeeze the positioning sleeve 204j, so that the positioning sleeve 204j further compresses the fourth spring 204k, so that the positioning rod 204i is inserted into the discharge port 105, thereby fixing the position of the baffle 206. At this time, the baffle 206 and the fixed plate 205 cooperate to seal the discharge port 105.

[0049] Specifically, the connecting member 204 also includes a support block 204m, a rocker arm 204n, a first support sleeve 204o, a second support sleeve 204p and a cable 204q. The support block 204m is fixed to the bottom of the protective shell 202c, the rocker arm 204n is hinged to the surface of the support block 204m, the first support sleeve 204o is fixed to the bottom of the protective shell 202c, the second support sleeve 204p is fixed to the top of the screw extruder 101, and the two ends of the cable 204q are respectively fixed to the end of the rocker arm 204n and the top of the detection plate 201b.

[0050] The support block 204m is used to support the rocker arm 204n so that the rocker arm 204n can rotate. When the detection plate 201b is squeezed by the mixed material in the feed port of the screw extruder 101, the detection plate 201b will rotate with the support shaft 201a as the fulcrum, so that the detection plate 201b pulls the cable 204q. At this time, the cable 204q can pull the end of the rocker arm 204n, so that the rocker arm 204n pushes the extrusion rod 204e upward.

[0051] When in use, the driving motor 202a is started, and the driving motor 202a can drive the rotating shaft 203c to rotate continuously.

[0052] When the mixed material in the feed bin of the screw extruder 101 is less than the threshold value, the detection plate 201b moves out of the screw extruder 101 under the reset elastic force of the first spring 201c. At this time, the cable 204q slows down the pulling force on the swing rod 204n. At this time, under the reset elastic force of the second spring 204d, the extrusion sleeve 204b can be moved away from the driving plate 204g. At this time, under the reset elastic force of the fourth spring 204k, the positioning sleeve 204j can squeeze the positioning rod 204i into the baffle 206, and the other end of the positioning rod 204i will The push rod 204h is squeezed so that the positioning rod 204i is inserted into the rotating shaft 203c. At this time, the rotating shaft 203c can drive the baffle 206 to rotate through the positioning rod 204i, so that the mixed material in the discharge port 105 falls into the feed bin of the screw extruder 101 through the grooves on both sides of the fixed plate 205. When the baffle 206 rotates, it can drive the threaded strip 207 and the rotating ring 208 to rotate synchronously, so that the threaded strip 207 drives the mixed material in the discharge port 105 to discharge, thereby preventing the mixed material from being blocked in the discharge port 105.

[0053] When the mixed material in the feed bin of the screw extruder 101 is higher than the threshold value, during the process of the mixed material in the feed bin of the screw extruder 101 increasing, the detection plate 201b will pull the cable 204q, so that the cable 204q drives the swing rod 204n to push the extrusion rod 204e upward, and at this time the extrusion rod 204e squeezes the third spring 204f, and the third spring 204f pushes the extrusion sleeve 204b, so that the extrusion sleeve 204b is inserted between the extrusion grooves of the two drive plates 204g. As the baffle 206 rotates, when the positioning rod 204i moves to one side of the positioning sleeve 204j, the extrusion sleeve 204b pushes the two drive plates 204g away from each other. The driving plate 204g squeezes the positioning rod 204i through the two push rods 204h. At this time, the positioning rod 204i will squeeze the positioning sleeve 204j, so that the positioning sleeve 204j further compresses the fourth spring 204k, so that the positioning rod 204i is inserted into the discharge port 105, thereby fixing the position of the baffle 206. At the same time, the other end of the positioning rod 204i is separated from the rotating shaft 203c, and the rotating shaft 203c no longer drives the baffle 206 to rotate. At this time, the baffle 206 and the fixed plate 205 cooperate to seal the discharge port 105, so that the mixed material in the discharge port 105 will not fall into the feed bin of the screw extruder 101.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A modified plastic processing granulator, characterized in that: include, A main body component (100) comprises a screw extruder (101), a support column (102), a mixing barrel (103), a cover plate (104) and a discharge port (105), wherein the support column (102) is fixed to the top of the screw extruder (101), the mixing barrel (103) is fixed to one side of the support column (102), the cover plate (104) is located at the top of the mixing barrel (103), and the discharge port (105) is arranged below the mixing barrel (103); A discharge assembly (200) is arranged on the screw extruder (101), comprising a detection member (201), a driving member (202), a rotating member (203), a connecting member (204), a fixed plate (205), a baffle (206), a threaded strip (207) and a rotating ring (208), wherein the detection member (201) is arranged in the screw extruder (101), the driving member (202) is located at the top of the screw extruder (101), the rotating member (203) is located in the driving member (202), the connecting member (204) is arranged in the rotating member (203), the fixed plate (205) is fixed in the discharge port (105), the baffle (206) is located above the fixed plate (205), the threaded strip (207) is fixed to the top of the baffle (206), and the rotating ring (208) is fixed to the end of the threaded strip (207); The detection member (201) comprises a support shaft (201a), a detection plate (201b), a first spring (201c) and a stop block (201d); the support shaft (201a) is rotatably connected to the inside of the screw extruder (101); the detection plate (201b) is rotatably connected to the surface of the support shaft (201a); two ends of the first spring (201c) are respectively fixed to the inner wall of the detection plate (201b) and the inner wall of the screw extruder (101); and the stop block (201d) is fixed to one side of the detection plate (201b); The driving member (202) comprises a driving motor (202a), a first pulley (202b), a protective shell (202c) and a second pulley (202d), wherein the driving motor (202a) is fixed to the top of the screw extruder (101), the first pulley (202b) is fixed to the output end of the driving motor (202a), the protective shell (202c) is fixed to the top of the driving motor (202a), and the second pulley (202d) is rotatably connected to the protective shell (202c); The rotating member (203) comprises a support rod (203a), a support cap (203b) and a rotating shaft (203c), wherein the support rod (203a) is fixed to the inner wall of the discharge port (105), the support cap (203b) is fixed to the end of the support rod (203a), the rotating shaft (203c) is rotatably connected to the support cap (203b), and the second pulley (202d) is fixed to the surface of the rotating shaft (203c); The connecting member (204) comprises a connecting disk (204a), the connecting disk (204a) is fixed to the bottom of the fixing plate (205), the rotating shaft (203c) is rotatably connected inside the connecting disk (204a), and the protective shell (202c) is fixed to the bottom of the connecting disk (204a); The connecting member (204) further comprises an extrusion sleeve (204b), an extrusion ring (204c) and a second spring (204d); the extrusion sleeve (204b) slides inside the rotating shaft (203c); the extrusion ring (204c) is fixed to the surface of the extrusion sleeve (204b); and two ends of the second spring (204d) are respectively fixed to the top of the extrusion ring (204c) and the inner wall of the rotating shaft (203c); The connecting member (204) further comprises an extrusion rod (204e) and a third spring (204f), wherein the extrusion rod (204e) slides in the extrusion sleeve (204b), and two ends of the third spring (204f) are respectively fixed to the end of the extrusion rod (204e) and the inner wall of the extrusion sleeve (204b); The connecting member (204) further comprises a driving plate (204g), a push rod (204h), a positioning rod (204i), a positioning sleeve (204j), a fourth spring (204k) and a positioning column (204l); the driving plate (204g) slides in the rotating shaft (203c); the push rod (204h) is fixed to one side of the driving plate (204g); the positioning rod (204i) slides in the baffle plate (206); the positioning sleeve (204j) slides in the discharge port (105); two ends of the fourth spring (204k) are respectively fixed to the inner wall of the positioning sleeve (204j) and the inner wall of the discharge port (105); and the positioning column (204l) is fixed to one side of the positioning sleeve (204j); The connecting member (204) also includes a support block (204m), a rocker arm (204n), a first support sleeve (204o), a second support sleeve (204p) and a cable (204q), wherein the support block (204m) is fixed to the bottom of the protective shell (202c), the rocker arm (204n) is hinged to the surface of the support block (204m), the first support sleeve (204o) is fixed to the bottom of the protective shell (202c), the second support sleeve (204p) is fixed to the top of the screw extruder (101), and the two ends of the cable (204q) are respectively fixed to the end of the rocker arm (204n) and the top of the detection plate (201b).

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