Constant force reservoir grease gun

Abstract

The application relates to a constant force oil storage cylinder grease gun, the constant force being 5 to 25 kg, which comprises an oil storage cylinder body, a piston mechanism, the piston mechanism being connected to the front end of the oil storage cylinder body and extending into the cylinder body, the oil storage cylinder body being provided with an oil inlet and outlet, the rear end of the oil storage cylinder body being provided with a disc spring mounting seat, the disc spring mounting seat being provided with a disc spring, a pull rod extending into the inside of the cylinder body from the rear end of the oil storage cylinder body, the outer end of the disc spring being connected to the part close to the outer end of the pull rod, and the inner end of the pull rod being provided with a piston; a locking mechanism for locking the pull rod is arranged between the disc spring mounting seat and the pull rod, and the locking mechanism comprises a pull rod locking plate supported by the disc spring mounting seat and a compression spring arranged between the pull rod locking plate and the disc spring mounting seat. The application adopts the disc spring structure, the disc spring has a constant force effect, the locking mechanism is provided, the pull rod locking plate is pushed by the trigger of the piston, automatic locking is realized, and after locking, the locking can be released by single-handed pressing, so that the application is convenient, fast, safe and reliable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of grease gun, and particularly relates to a constant force oil storage cylinder grease gun with a constant force of 5 to 25 kg. BACKGROUND

[0002] The grease gun is a tool for lubricating mechanical equipment. The conventional grease gun uses a compression spring which is arranged in the oil storage cylinder. During operation, the compression spring is stretched and compressed under the action of external push-pull force. The compression spring may collide with the inner wall of the oil storage cylinder, damaging the inner wall of the oil storage cylinder and causing oil leakage. Moreover, when the compression spring is compressed, the greater the compression amplitude, the greater the external pulling force required, and uneven force is generated during manual operation.

[0003] The grease gun realizes the suction and discharge of lubricating grease through the extension and retraction of the pull rod. In actual application, it is found that if the pull rod is accidentally touched after being pulled out and locked, the pull rod will quickly retract under the action of the spring, which is easy to hit the human body. If there is lubricating grease in the oil storage cylinder at this time, the lubricating grease will be quickly discharged. SUMMARY

[0004] The present application mainly aims at the defects of the above-mentioned grease gun, and invents a constant force oil storage cylinder grease gun. The constant force oil storage cylinder grease gun adopts a disc spring structure, the disc spring has a constant force effect, the constant force is 5 to 25 kg, that is, the pulling force of the constant force disc spring when pulled out is irrelevant to the pulling distance, which is similar to the pulling effect of a tape measure. The compression spring is arranged in the oil storage cylinder, which occupies part of the oil storage space. The space occupied by the constant force disc spring is smaller than that of the compression spring, and the constant force disc spring can be arranged outside the oil storage cylinder. Therefore, the oil storage cylinder with the same length and capacity can store more oil. The constant force oil storage cylinder grease gun has a locking mechanism. The pull rod lock plate utilizes the elastic recovery effect of the compression spring to generate a deviation relative to the pull rod, and the locking is realized through the deviation of the clamping member. When the locking is performed, the oil storage cylinder is filled with lubricating grease. At this time, the piston is close to the cylinder cover, the pull rod lock plate is pushed by the trigger member of the piston, a slight inclination and deviation are generated, and the automatic locking is realized. After the locking is performed, the locking can be released by pressing with one hand, which is convenient, fast, safe and reliable.

[0005] The above technical problems of the present application are solved by the following technical scheme: a constant force oil storage cylinder grease gun, comprising an oil storage cylinder body and a piston mechanism. The inside of the oil storage cylinder body is hollow to form a piston cavity. The piston mechanism is connected to the front end of the oil storage cylinder body and extends into the cylinder body. The oil storage cylinder body is provided with an oil inlet and outlet. The rear end of the oil storage cylinder body is provided with a disc spring mounting seat. The disc spring mounting seat is provided with a disc spring. A pull rod extends into the inside of the cylinder body from the rear end of the oil storage cylinder body. The outer end of the disc spring is connected to the part close to the outer end of the pull rod. The inner end of the pull rod is provided with a piston.

[0006] A locking mechanism for locking the pull rod is arranged between the disc spring mounting seat and the pull rod. The locking mechanism comprises a pull rod lock plate supported by the disc spring mounting seat and a compression spring arranged between the pull rod lock plate and the disc spring mounting seat.

[0007] As a preferred, the constant force is 5 to 25 kg.

[0008] As a preferred, two disc springs are installed in the disc spring mounting seat, the pull rod passes through the disc spring mounting seat, and the two disc springs are respectively symmetrically located on both sides of the pull rod inside the disc spring mounting seat; the outer ends of the two disc springs are respectively fixed to the outer ends of the pull rod. The purpose of symmetrically arranging the disc springs is to balance the force of the pull rod. If only one disc spring is used, the effect of constant force pulling out can also be achieved, but the force on the pull rod is slightly uneven, and there is a small inclination in the pulling-out process of the pull rod, which causes serious wear and tear.

[0009] As a preferred, the cross section of the pull rod is in the shape of an I-beam, including a pull rod body, an upper folded edge perpendicular to the upper end of the pull rod body, and a lower folded edge perpendicular to the lower end of the pull rod body; the disc spring is wound by a long spring sheet or a long steel wire, and the exposed spring sheet or steel wire of the disc spring is between the upper folded edge and the lower folded edge of the pull rod; the plane where the two disc springs are located and the plane where the pull rod is located are the same plane. The outer end of the pull rod is provided with a pull handle for conveniently pulling out the pull rod, and the pull handle is the force point of external force, which is convenient for pushing and pulling operation. The I-shaped pull rod is suitable for the structure of two disc springs, and the I-shaped pull rod matches the disc spring of the spring sheet type, the pulled-out spring sheet can be placed between the upper folded edge and the lower folded edge of the pull rod, and the spring sheet can tightly adhere to the side wall of the pull rod body; in the process of continuous pushing and pulling of the pull rod, the spring sheet will not be blocked by other components and will not be worn; more importantly, the disc spring will not be exposed from the pull rod to cut the human body, such as easily cutting the hand when the tape measure is freely retracted.

[0010] As a preferred, one disc spring is installed in the disc spring mounting seat, the disc spring is located on one side of the pull rod, and the outer end of the disc spring is fixed to the outer end of the pull rod.

[0011] As a preferred, three or more disc springs are installed in the disc spring mounting seat, the pull rod passes through the disc spring mounting seat, and inside the disc spring mounting seat, all the disc springs are arranged in a circular radial manner around the pull rod, are uniformly distributed in 360 degrees, and the force between each disc spring and the pull rod is balanced; at the same time, the pull rod is arranged as a columnar rod member with a polygonal cross section, each disc spring respectively faces one side wall of the pull rod; each axial edge of the pull rod has an outwardly convex folded edge, and the part of the disc spring exposed to the disc spring mounting seat is located close to the side wall of the pull rod and between adjacent folded edges.

[0012] As preferred, the rear end of the oil storage cylinder body is connected with a cylinder cover, the cylinder cover comprises a middle cover plate and a cylinder cover sidewall arranged around the periphery of the cover plate; the cylinder cover sidewall is connected with the sidewall of the rear end of the oil storage cylinder body, the center of the cover plate is provided with a center hole for facilitating the passage of the pull rod; the disc spring mounting seat is arranged outside the cylinder cover and fixedly connected with the cylinder cover; the disc spring mounting seat is provided as a box body with an internal cavity, the height and width of the cavity are matched with the specifications of the disc spring; one of the opposite sides of the disc spring mounting seat is provided with a through hole, the pull rod is inserted into the through hole and further passes through the center hole in the center of the cover plate of the cylinder cover. The disc spring mounting seat is detachably fixed on the cylinder cover, which is convenient for maintenance and cleaning. Of course, the disc spring mounting seat can also be a part of the cylinder cover, which is not convenient for processing.

[0013] As preferred, the upward top surface of the disc spring mounting seat and the edge close to the cylinder cover are provided with a guide through hole, and the downward bottom surface of the disc spring mounting seat and the edge close to the cylinder cover are provided with another guide through hole; the pull rod lock plate is inserted into the two guide through holes at the same time; the plate surface of the pull rod lock plate is provided with a I-shaped profile passage hole, the pull rod is inserted into the passage hole; the upper end of the pull rod lock plate is vertically extended to form a pressing part, the pressing part is exposed above the disc spring mounting seat, and the pressing part and the top surface of the disc spring mounting seat are connected with the compression spring. When unlocking, the pressing part of the pull rod lock plate is pressed from top to bottom to drive the pull rod lock plate to move downward, the pull rod lock plate is hooked by the inclined boss on the cylinder cover, the passage hole is aligned with the pull rod, the clamping part of the passage hole is separated from the clamping groove of the pull rod locking part, the unlocking is successful, and the pull rod can move back and forth at will; without any external force, the pull rod lock plate cannot be unlocked automatically; when the pull rod is pulled to the end, the piston pushes the pull rod lock plate away from the inclined boss on the cylinder cover; the compression spring acts on the pressing part to drive the pull rod lock plate to move upward as a whole, the offset passage hole is misaligned with the pull rod, the clamping part of the passage hole is embedded in the clamping groove of the pull rod locking part, and the locking is performed.

[0014] As preferred, the part of the pull rod close to the piston is provided as a locking part; on the locking part of the pull rod, the two sides of the upper folded edge are symmetrically provided with an upper recessed clamping groove, and the two sides of the lower folded edge are symmetrically provided with a lower recessed clamping groove; when the pull rod lock plate is aligned with the locking part of the pull rod and the pull rod lock plate is vertically offset relative to the pull rod, the pull rod lock plate can be correspondingly embedded in the upper clamping groove to limit the passage of the pull rod. Only when the locking part of the pull rod is vertically aligned with the pull rod lock plate, the locking or unlocking can be performed.

[0015] As preferred, the through hole of the pull rod lock plate extends downward from the lower edge of the through hole to form a rectangular through hole shaped first engaging member; meanwhile, the second engaging member is provided on the barrel cover and is relatively protruding, the first engaging member and the second engaging member can be engaged with each other to limit the vertical deviation of the pull rod lock plate relative to the pull rod; the lower end of the pull rod lock plate has a downwardly extending limiting member, when the pull rod lock plate deviates vertically upward relative to the pull rod, the limiting member can abut against the bottom surface of the disc spring mounting seat or the bottom surface of the pull rod to block the pull rod lock plate from continuing to move upward, avoiding that the lower end of the pull rod lock plate is completely separated from the guide hole in the bottom surface of the disc spring mounting seat. After unlocking, if the pressing action on the pressing part is immediately eliminated, the pull rod lock plate will immediately restore to move upward, therefore, in order to keep the pull rod lock plate in the unlocked state, the first engaging member and the second engaging member are abutted and engaged with each other.

[0016] As preferred, the piston is provided with a trigger member extending axially along the pull rod sidewall and towards the barrel cover, the trigger member can pass through the center hole of the barrel cover and push the pull rod lock plate to be inclined, the first engaging member of the inclined pull rod lock plate can be disengaged with the second engaging member; the trigger member is below the pull rod, and it is easier to push the pull rod lock plate to be inclined. The locking process of the pull rod is automatic, when the pull rod is manually pulled open, the piston is close to the barrel cover, after the piston continues to move outward with the pull rod, the trigger member on the piston passes through the center hole of the barrel cover and pushes the pull rod lock plate, so that the pull rod lock plate is slightly inclined, at the same time, the first engaging member is disengaged from the constraint of the second engaging member, and the pull rod lock plate deviates upward under the action of the compression spring and locks the pull rod.

[0017] In summary, compared with the prior art, the present application has the following advantages:

[0018] The present application adopts the disc spring structure, the disc spring has constant force effect, the constant force is 5 to 25 kg, that is, the pulling force of the constant force disc spring is irrelevant to the pulling distance, which is similar to the pulling effect of a tape measure; the disc spring of the present application is outside the oil storage cylinder and will not cause damage to the inside of the oil storage cylinder; the disc spring of the present application will not occupy the space inside the oil storage cylinder, and the oil storage cylinder of the same length and capacity can store more oil; the present application has a pull rod lock plate, the pull rod lock plate utilizes the elastic recovery effect of the compression spring to deviate relative to the pull rod, and the locking is realized through the misalignment of the engaging members generated by the deviation; the locking operation of the present application is automatic, and the locking timing is when the piston is close to the barrel cover position, the trigger member of the piston is used to push the pull rod lock plate to be slightly inclined and deviated to realize automatic locking, and after locking, the pull rod can be unlocked by pressing with one hand, which is convenient and fast; the first engaging member and the second engaging member are mutually constrained between the pull rod lock plate and the barrel cover to maintain the pull rod in the unlocked state. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a cross-sectional view of the locking mechanism of the present invention;

[0022] Figure 4 yes Figure 3 Enlarged view of section A;

[0023] Figure 5 This is a cross-sectional view of the pull rod locking plate and the pull rod of the present invention;

[0024] Figure 6 This is a schematic diagram of the pull rod locking plate and the pull rod in the locked state according to the present invention.

[0025] The following are the labels in the diagram: 1. Oil reservoir body; 2. Coil spring mounting base; 3. Coil spring; 4. Pull rod; 41. Pull rod body; 42. Upper folded edge; 43. Lower folded edge; 45. Upper slot; 46. Lower slot; 5. Piston; 51. Trigger; 6. Pull rod locking plate; 60. Through hole; 61. Pressing part; 62. First locking part; 63. Restricting part; 7. Compression spring; 8. Cylinder cover; 81. Second locking part; 9. Pull handle. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1:

[0028] like Figure 1 , 2 As shown, a constant force oil reservoir grease gun with a constant force of 5 to 25 kg mainly includes an oil reservoir body 1 and a piston mechanism. The interior of the oil reservoir body 1 is hollow to form a piston chamber. The piston mechanism is connected to the front end of the oil reservoir body 1 and extends into the cylinder. The piston mechanism is mainly composed of a pull rod 4 and a piston 5. The oil reservoir body 1 is provided with an oil inlet and outlet. The front end of the oil reservoir body 1 is provided with a coil spring mounting seat 2 and a locking mechanism.

[0029] The front end of the oil storage cylinder body 1 is connected to the cylinder cover 8. The cylinder cover 8 includes a central cover plate and a cylinder cover side wall formed by vertically extending from the periphery of the cover plate. The side wall of the cylinder cover 8 is connected to the side wall of the front end of the oil storage cylinder body 1. The cylinder cover 8 and the oil storage cylinder body 1 can be connected by threads, or the cylinder cover 8 can be directly and tightly fitted onto the front end of the oil storage cylinder body 1. The cover plate has a central hole in the center, and the outline of the central hole is I-shaped. The pull rod 4 passes through the central hole.

[0030] A disc spring mounting seat 2 is fixed outside the cylinder cover 8, and two disc springs 3 are placed in the disc spring mounting seat 2; the disc spring mounting seat 2 is a box body with a cavity inside, and the surface close to the cylinder cover 8 is open, while the other surface opposite to the open surface has a hole in the center, and a pull rod 4 passes through the hole to extend into the inside of the cylinder body 1 through the center hole in the center of the cover plate of the cylinder cover 8, and the inner end of the pull rod 4 is fixed with a piston 5.

[0031] In the inside of the disc spring mounting seat 2, the two disc springs 3 are symmetrically located on both sides of the pull rod 4, and the plane where the two disc springs 3 are located and the plane where the pull rod 4 is located are the same plane; the two disc springs 3 are both wound by long spring leaves, and the outer ends of the two disc springs 3 are respectively fixed on both sides of the outer end of the pull rod 4.

[0032] The cross section of the pull rod 4 is in the shape of an I-beam, including a pull rod body 41 in the middle, an upper folded edge 42 perpendicular to the upper end of the pull rod body, and a lower folded edge 43 perpendicular to the lower end of the pull rod body; a disc spring fixing pin is connected to the outer end of the pull rod body 41, and the disc spring fixing pin 44 vertically penetrates the pull rod body 41; the outer ends of the two disc springs 3 have through holes and are respectively connected to both ends of the disc spring fixing pin; the spring leaves exposed outside the disc spring mounting seat 2 are between the upper folded edge 42 and the lower folded edge 43 of the pull rod 4.

[0033] The outer end of the pull rod 4 has a pull handle 9 also fixed on the disc spring fixing pin, and the pull handle 9 is in the shape of a ring or a straight rod, which is convenient for gripping and pulling.

[0034] The part of the pull rod 2 close to the piston 5 and exposed outside the cylinder cover 1 is provided as a locking part, and specifically, on the locking part, the upper folded edge 42 has upper recessed clamping grooves 45 symmetrically arranged on both sides, and the lower folded edge 43 has lower recessed clamping grooves 46 symmetrically arranged on both sides, and the upper clamping grooves 45 and the lower clamping grooves 46 are vertically aligned.

[0035] The edge close to the cylinder cover 8 of the upward top surface of the disc spring mounting seat 2 has a guide through hole, and the edge close to the cylinder cover 8 of the downward bottom surface of the disc spring mounting seat 2 has another guide through hole; a pull rod lock plate 6 passes through the two guide through holes.

[0036] As shown in the drawings, Figure 5 , 6 The plate surface of the pull rod lock plate 6 has a guide hole 60 in the shape of an I-beam, and the pull rod 4 passes through the guide hole 60; the upper end of the pull rod lock plate 6 vertically extends to form a pressing part 61, and the pressing part 61 is exposed above the disc spring mounting seat 2, and the pressing part 61 and the top surface of the disc spring mounting seat 2 are connected with the compression spring 7.

[0037] When the locking part of the pull rod 4 is aligned with the pull rod lock plate 6 and the pull rod lock plate 6 is vertically offset upward relative to the pull rod 4, the pull rod lock plate 6 can be correspondingly embedded in the upper clamping groove 45 to limit the passing of the pull rod 4.

[0038] The lower plate surface of the trolley lock plate 6 extends downward from the lower end of the through hole 60 to form a rectangular through hole shaped first engaging member 62; meanwhile, the lower edge of the cylinder cover 8 has a second engaging member 81 which is vertically and horizontally protruded relative to the cover plate, in particular, the second engaging member 81 is set as a right triangle, when the trolley lock plate 6 is in the unlocked state, the downward bottom surface of the second engaging member 81 is clamped in the bottom edge of the first engaging member 62 to limit the vertical deviation of the trolley lock plate 6 relative to the trolley 4.

[0039] As shown in Figure 3 , 4 , the lower edge of the trolley lock plate 6 also has a downward inclined limiting member 63, when the trolley lock plate 6 is vertically upward deviated relative to the trolley 4, the limiting member 63 can be in contact with the bottom surface of the disc spring mounting seat 2 to block the trolley lock plate 6 from continuing to move upward.

[0040] The piston 5 and the trigger member 51 are fixed at the inner end of the trolley 4, the trigger member 51 is a section of rod member or arc-shaped plate member which is axially extended along the side wall of the piston 5 and formed towards the cylinder cover 8, the trigger member 51 can horizontally pass through the center hole of the cylinder cover 8 and push the trolley lock plate 6 to be inclined, after being inclined, the first engaging member 62 of the trolley lock plate 6 is separated from the second engaging member 81, the trolley lock plate 6 is deviated upward under the action of the compression spring 71 to lock the trolley 4.

[0041] Example 2:

[0042] Compared with example 1, the difference of the present example is that a disc spring 3 is installed in the disc spring mounting seat 2, the disc spring 3 is located at one side of the trolley 4, and the outer end of the disc spring 3 is fixed to the outer end of the trolley 4.

[0043] Example 3:

[0044] Compared with example 1, the difference of the present example is that 3 to 6 disc springs 3 are installed in the disc spring mounting seat 2, and the trolley 4 passes through the center of the disc spring mounting seat 2; the disc spring mounting seat 2 can be set as a cylindrical shape, and all the disc springs 3 are arranged in a circumferential radial manner around the trolley 4 in the interior of the disc spring mounting seat 2; meanwhile, the trolley 4 is set as a columnar rod member with a polygonal cross section, for example, a prismatic trolley 4 matches the installation of 3 disc springs 3, a square columnar trolley 4 matches the installation of 4 disc springs 3, a five-edged prismatic trolley 4 matches the installation of 5 disc springs 3, and a six-edged prismatic trolley 4 matches the installation of 6 disc springs; each disc spring 3 respectively faces one side wall of the trolley 4; each axial edge of the trolley 4 has an outward protruding folded edge; the spring sheet exposed to the disc spring mounting seat 2 corresponds to the trolley 4 side wall and is located between adjacent folded edges.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the application. Various modifications or changes in addition or substitution to the described specific embodiments can be made by those skilled in the art without departing from the spirit of the application or exceeding the scope of the appended claims.

Claims

1. A constant-force grease gun with a grease reservoir, comprising a cylinder and a piston mechanism, wherein the interior of the cylinder is hollow to form a piston chamber, the piston mechanism is connected to the front end of the cylinder and extends into the cylinder, and the cylinder is provided with an oil inlet and an oil outlet, characterized in that, The rear end of the barrel is provided with a disc spring mounting seat, a disc spring is arranged in the disc spring mounting seat, a pull rod extends into the barrel from the rear end of the barrel, the outer end of the disc spring is connected to the outer end of the pull rod, and the inner end of the pull rod is provided with a piston; A locking mechanism for locking the pull rod is arranged between the disc spring mounting seat and the pull rod, and the locking mechanism comprises a pull rod locking plate supported by the disc spring mounting seat and a compression spring arranged between the pull rod locking plate and the disc spring mounting seat; The pull rod has an I-shaped cross section, comprising a pull rod main body, an upper folded edge perpendicular to the upper end of the pull rod main body and a lower folded edge perpendicular to the lower end of the pull rod main body; The rear end of the barrel is connected to a barrel cover, and the barrel cover comprises a cover plate and a barrel cover sidewall arranged around the cover plate; The edge of the upward top surface of the disc spring mounting seat close to the barrel cover has a guide through hole, and the edge of the downward bottom surface of the disc spring mounting seat close to the barrel cover has another guide through hole; the pull rod locking plate is inserted into the two guide through holes at the same time; the plate surface of the pull rod locking plate has an I-shaped profiled through hole, and the pull rod is inserted into the through hole; the upper end of the pull rod locking plate is vertically extended to form a pressing part, the pressing part is exposed above the disc spring mounting seat, and the compression spring is connected between the pressing part and the top surface of the disc spring mounting seat; The part of the pull rod close to the piston is arranged as a locking part; on the locking part of the pull rod, the two sides of the upper folded edge are symmetrically provided with recessed upper clamping grooves, and the two sides of the lower folded edge are symmetrically provided with recessed lower clamping grooves; when the pull rod locking plate is aligned with the locking part of the pull rod and the pull rod locking plate is vertically offset relative to the pull rod, the through hole of the pull rod locking plate can be correspondingly embedded into the upper clamping grooves and the lower clamping grooves to limit the through running of the pull rod; A first clamping part in the shape of a rectangular through hole is extended downward from the lower edge of the through hole; the barrel cover is provided with a second clamping part in the shape of a relative protrusion, the first clamping part and the second clamping part can be clamped with each other to limit the vertical offset of the pull rod locking plate relative to the pull rod; the lower end of the pull rod locking plate has a limiting part extending downward at an angle, which can abut against the bottom surface of the disc spring mounting seat or the bottom surface of the pull rod to block the continuous upward movement of the pull rod locking plate when the pull rod locking plate is vertically upwardly offset relative to the pull rod; The piston is provided with a trigger part extending along the axial direction of the pull rod and towards the barrel cover, the trigger part can pass through the center hole of the barrel cover and push the pull rod locking plate to be inclined, and the first clamping part of the inclined pull rod locking plate can be separated from the second clamping part; The constant force is 5-25 kg.

2. The constant force reservoir grease gun of claim 1, wherein, Two disc springs are arranged in the disc spring mounting seat, the pull rod passes through the disc spring mounting seat, and the two disc springs are symmetrically arranged on the two sides of the pull rod in the interior of the disc spring mounting seat; the outer ends of the two disc springs are respectively fixed to the outer ends of the pull rod.

3. The constant force reservoir grease gun of claim 2, wherein, The disc spring is formed by winding a long spring sheet or a long steel wire, and the exposed spring sheet or steel wire is between the upper folded edge and the lower folded edge of the pull rod.

4. The constant force reservoir grease gun of claim 3, wherein, The barrel cover sidewall is connected to the sidewall of the rear end of the barrel, the center of the cover plate has a center hole for the through running of the pull rod; the disc spring mounting seat is arranged outside the barrel cover and fixedly connected to the barrel cover; the disc spring mounting seat is arranged as a box body with an empty cavity in the interior.

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