A tinplate can rolling forming equipment

Abstract

The invention discloses a tinplate can rolling and forming equipment, which belongs to the technical field of tinplate can rolling and forming. It includes a support frame, the front end of the support frame is fixedly connected with a base, the upper end of the base is fixedly connected with two symmetrically distributed supports, the inner side walls of the supports are rotatably connected with clamping members, the two clamping members are symmetrically distributed with the same center of a circle, and motors are installed on the rear ends, the upper ends of the supports are fixedly connected with a limiting plate, the limiting plate is located on the outside of the clamping members, the left end of the support frame is fixedly connected with a connecting seat, the upper end of the connecting seat is installed with a quality inspection member, and the left side of the quality inspection member is installed with a shaping member, the inner top end of the support frame is fixedly connected with a hydraulic rod, the telescopic end of the hydraulic rod is fixedly connected with the connecting plate, and the bottom end of the connecting plate is installed with a round pressing member, so that no human labor is required during the rolling and forming period, and a complete set of automated and flow-type tinplate can rolling and forming operations can be formed, thereby greatly improving the processing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tinplate can rolling and forming, and more specifically to a tinplate can rolling and forming device. Background Art

[0002] Tinplate is a sheet of iron with a layer of tin on the surface. It is not easy to rust. It is the common name for electroplated tin steel sheet. The English abbreviation is SPTE, which refers to cold-rolled low-carbon steel sheet or strip plated with commercial pure tin on both sides. Tin plating is mainly used to prevent corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in one material. It has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility. In view of the various excellent properties of tinplate, tinplate is often used to make various cans for storage and packaging of goods.

[0003] At present, in the production process of tinplate can coiling, the plate needs to be sheared and then rolled to facilitate the welding of the can body. However, in the prior art, the rolling of tinplate cans is mostly done by manual rolling, which has poor rolling effect and low work efficiency and cannot meet production needs. Therefore, this scheme proposes a tinplate can rolling forming equipment. Summary of the invention

[0004] 1. Technical problems to be solved:

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a tinplate can rolling forming equipment, which can achieve no need for human labor during the rolling forming period and can form a complete set of automated, flow-type tinplate can rolling forming operations, thereby greatly improving the processing efficiency.

[0006] 2. Technical solution:

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A tinplate can rolling forming equipment comprises a support frame, the front end of the support frame is fixedly connected to a base, the upper end of the base is fixedly connected to two symmetrically distributed supports, the inner side walls of the supports are rotatably connected to clamping pieces, the two clamping pieces are symmetrically distributed about the same center of a circle, and a motor is installed on the rear side ends, the upper ends of the supports are fixedly connected to a limiting plate, the limiting plate is located on the outside of the clamping piece, the left end of the support frame is fixedly connected to a connecting seat, the upper end of the connecting seat is installed with a quality inspection piece, the left side of the quality inspection piece is installed with a shaping piece, the inner top end of the support frame is fixedly connected to a hydraulic rod, the telescopic end of the hydraulic rod is fixedly connected to a connecting plate, and the bottom end of the connecting plate is installed with a rounding piece.

[0009] A further improvement is that the shaping piece includes a shaping box fixedly connected to the left side of the quality inspection piece, two symmetrically distributed conveyor belts are embedded and installed at the inner bottom end of the shaping box, an electric heating plate is embedded and installed on the center side of the inner bottom of the shaping box, and the right side end of the shaping box is connected to the quality inspection piece.

[0010] A further improvement is that the quality inspection part includes a quality inspection box fixedly connected to the upper end of the connecting seat, and two symmetrically distributed conveyor belts are embedded and installed on the inner bottom end of the quality inspection box. Discharge troughs are opened at both ends of the left and right ends of the quality inspection box, wherein a positioning part is embedded and installed on the inner bottom wall of the right discharge trough, and a surface defect detection component is installed between the inner walls of the left discharge trough, and a stray product recovery part is embedded and installed on the center side of the inner bottom end of the quality inspection box.

[0011] A further improvement is that the positioning member includes two receiving grooves opened on the inner bottom wall of the discharge trough, a positioning plate 1 is rotatably connected between the inner walls of the receiving grooves, and a spring is fixedly connected between the positioning plate 1 and the bottom wall of the receiving groove.

[0012] A further improvement is that the surface defect detection component includes a shaping plate fixedly connected to the upper and lower walls of the left side of the discharge trough, the outer surface of the discharge trough is embedded with an infrared temperature sensor, and the side of the shaping plate close to the shaping part is set as an arc surface.

[0013] A further improvement is that the uneven product recovery part includes a telescopic rod installed at the bottom end of the quality inspection box, the upper end of the telescopic rod is fixedly connected to a load-bearing plate, the load-bearing plate and the inner bottom wall of the quality inspection box are in the same horizontal plane, and a material trough is provided at the top of the quality inspection box.

[0014] A further improvement is that a second positioning plate is fixedly connected to the inner top wall of the discharge chute on the right side.

[0015] A further improvement is that the pressing round part includes a driving box fixedly connected to the lower end of the connecting plate, a through hole is opened at the front end of the driving box, a pressure rod is fixedly connected to the bottom wall of the through hole, a slide rail is fixedly connected to the inner top end of the driving box, the bottom end of the slide rail is slidably connected to a connecting block 1, the front end of the connecting block 1 is fixedly connected to a connecting block 2, the front end of the connecting block 2 is fixedly connected to a connecting sleeve, the connecting sleeve is located on the outside of the pressure rod, a motor 2 is installed on the top end of the rear side of the driving box, the output end of the motor 2 passes through the interior of the driving box and is fixedly connected to a turntable, a connecting rod is provided between the turntable and the bottom of the connecting block 1, a transmission seat is movably connected between the connecting rod and the turntable and the connecting block 1, and the transmission seat at the bottom of the turntable is eccentrically set.

[0016] A further improvement is that the side end of the connecting plate is rotatably connected to a limiting sleeve, and the bottom end of the limiting sleeve is arranged as an arc surface and fits with the surface of the pressure rod.

[0017] 3. Beneficial effects:

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

[0019] The present invention is reasonably designed. The sheared iron can sheet material is conveyed by a conveyor belt and placed inside a molding part for a certain period of heating operation, thereby improving the plasticity of the sheet material to be rolled and reducing deformation resistance, making the steel plate softer and easier to bend, and reducing the stress caused by bending, which is beneficial to the subsequent rolling forming efficiency. The sheet material is then further transmitted to the interior of the quality inspection part for surface scratch or dent detection to avoid affecting the subsequent rounding effect, and then transmitted to the top of the clamping part for positioning. Finally, the hydraulic rod is driven to cause the rounding part to descend, and the sheet material is bent until the desired shape is achieved, and the iron can after the coil is rolled is pushed down for subsequent continuous forming operations. During this period, no human labor is required, and a complete set of automated, flow-type tinplate can rolling and forming operations can be formed, greatly improving the processing efficiency.

[0020] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the shaping piece and the quality inspection piece of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of a part of the quality inspection part of the present invention;

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the quality inspection piece of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the present invention when it is pushed out after being rolled into a round shape;

[0026] Figure 6 It is a schematic structural diagram of the round pressing member of the present invention.

[0027] Description of the numbers in the figure:

[0028] 1. Support frame; 2. Base; 3. Support; 4. Clamping piece; 5. Limiting plate; 6. Connecting seat;

[0029] 7. Shaping piece; 71. Shaping box; 72. Conveyor belt 1; 73. Electric heating plate;

[0030] 8. Quality inspection parts; 81. Quality inspection box; 82. Conveyor belt 2; 83. Discharging trough; 84. Storage trough; 85. Positioning plate 1; 86. Spring; 87. Positioning plate 2; 88. Shaping plate; 89. Infrared temperature sensor; 811. Retrieving trough; 812. Telescopic rod; 813. Loading plate;

[0031] 9. Connecting plate; 91. Limit sleeve; 10. Hydraulic rod;

[0032] 11. Pressing round part; 111. Driving box; 112. Through hole; 113. Pressure rod; 114. Slide rail; 115. Connecting block 1; 116. Connecting block 2; 117. Connecting sleeve; 118. Motor 2; 119. Turntable; 120. Connecting rod. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example:

[0038] See also Figure 1-Figure 6 , a tinplate can rolling forming equipment, comprising a support frame 1, the front end of the support frame 1 is fixedly connected to a base 2, the upper end of the base 2 is fixedly connected to two symmetrically distributed supports 3, the inner side wall of the support 3 is rotatably connected to a clamping piece 4, the two clamping pieces 4 are symmetrically distributed with the same center of a circle, and a motor 1 is installed at the rear end, the upper end of the support 3 is fixedly connected to a limiting plate 5, and the limiting plate 5 is located on the outside of the clamping piece 4, the left end of the support frame 1 is fixedly connected to a connecting seat 6, the upper end of the connecting seat 6 is installed with a quality inspection piece 8, and the left side of the quality inspection piece 8 is installed with a shaping piece 7, the inner top end of the support frame 1 is fixedly connected to a hydraulic rod 10, the telescopic end of the hydraulic rod 10 is fixedly connected to a connecting plate 9, and the bottom end of the connecting plate 9 is installed with a round pressing piece 11.

[0039] During use, in order to make the existing technology more efficient in the rolling and forming operation of tinplate cans, and to realize automated and flow-type forming operation during use, in this embodiment, the sheared tinplate sheet is placed in the molding part 7 for a certain period of heating operation by conveying it through a conveyor belt, thereby improving the plasticity of the sheet to be rolled and reducing the deformation resistance, making the steel plate softer and easier to bend, and reducing the stress caused by bending, which is beneficial to the subsequent rolling and forming efficiency. Then, the sheet is further transmitted to the quality inspection part 8 for surface scratch or depression detection to avoid affecting the subsequent pressing effect, and then transmitted to the top of the clamping part 4 for positioning. Finally, under the drive of the hydraulic rod 10, the pressing part 11 is prompted to descend, and the sheet is bent until the desired shape is reached, and the tin can after the coil is rolled is pushed down for subsequent continuous forming operations. During this period, no human labor is required, and a complete set of automated and flow-type tinplate can rolling and forming operations can be formed, which greatly improves the processing efficiency.

[0040] See also Figure 1-Figure 2 and Figure 4The shaping piece 7 includes a shaping box 71 fixedly connected to the left side of the quality inspection piece 8, and two symmetrically distributed conveyor belts 72 are embedded and installed at the inner bottom end of the shaping box 71. An electric heating plate 73 is embedded and installed on the center side of the inner bottom of the shaping box 71, and the right side end of the shaping box 71 is connected to the quality inspection piece 8.

[0041] During use of this solution, when the iron can plate is transmitted to the inside of the shaping piece 7 through the conveying device, the conveyor belt 72 continues to drive the plate until the plate is moved to the inside of the shaping box 71 and is located above the electric heating plate 73. The electric heating plate 73 then heats the plate at this time, so that the surface of the plate continues to heat up, becoming softer and easier to bend, and reducing the stress caused by bending. At the same time, the bending force under the initial rolling is reduced, so that the surface can be more easily shaped, which is beneficial to the subsequent rolling forming efficiency.

[0042] See also Figure 1-Figure 4 The quality inspection part 8 includes a quality inspection box 81 fixedly connected to the upper end of the connecting seat 6, and two symmetrically distributed conveyor belts 82 are embedded and installed at the inner bottom end of the quality inspection box 81. Discharge troughs 83 are opened at both ends of the left and right ends of the quality inspection box 81, wherein a positioning part is embedded and installed on the inner bottom wall of the right discharge trough 83, and a surface defect detection component is installed between the inner walls of the left discharge trough 83, and a mixed product recovery part is embedded and installed on the center side of the inner bottom end of the quality inspection box 81.

[0043] More specifically: the surface defect detection component includes a shaping plate 88 fixedly connected to the upper and lower walls of the left discharge trough 83, and the outer surface of the discharge trough 83 is embedded with an infrared temperature sensor 89, and the side of the shaping plate 88 close to the shaping part 7 is an arc surface.

[0044] During the use of this solution, after the plate passes through the shaping member 7 for heating, the plate is gradually placed between the two shaping plates 88 after being conveyed. Since the plate becomes softer after being heated, the two upper and lower limiting shaping plates 88 can smooth the plate with some curvature at this time to ensure the flatness during the subsequent rolling and forming. Since the plate has heat on the surface after being heated, the infrared temperature sensor 89 can detect the temperature change on the surface of the plate when the plate passes through each place of the infrared temperature sensor 89, thereby identifying dents, cracks or pits, and thus identifying some plates of poor quality;

[0045] Compared with the prior art, during this period, since the plate has been heated in advance during the shaping operation, the light source system and high-frequency sensing system required for the existing dent mark detection are eliminated in this embodiment. Under the action of the infrared temperature sensor 89, the temperature change on the surface of the plate can be directly detected, thereby knowing the quality of the plate, saving the existing early and mid-stage plate dent mark detection steps and reducing the cost of the required detection.

[0046] See also Figure 1-Figure 4 The mixed product recovery parts include a telescopic rod 812 installed at the bottom end of the quality inspection box 81, and the upper end of the telescopic rod 812 is fixedly connected with a supporting plate 813. The supporting plate 813 and the inner bottom wall of the quality inspection box 81 are in the same horizontal plane, and a material trough 811 is opened at the top of the quality inspection box 81.

[0047] During use of this solution, when the infrared temperature sensor 89 detects that the quality of the plate to be rolled is defective, the infrared temperature sensor 89 transmits a signal to the PLC control system. When the plate is transported to the bottom of the material trough 811, it is driven by the telescopic rod 812 to move the supporting plate 813 upward, thereby transporting the poor quality plate upward, so that personnel can take out the plate for recycling, avoiding the waste of materials caused by the continued rolling of the poor quality plate.

[0048] See also Figure 1-Figure 4 A second positioning plate 87 is fixedly connected to the inner top wall of the discharge chute 83 on the right side.

[0049] During use of the present solution, by setting a second positioning plate 87, the sheet material can be shaped for the last time when passing through the discharge chute 83 to ensure overall flatness, and subsequently, under the continuous conveyance of the discharge chute 83, the sheet material can be stably displaced to the top of the two clamping members 4 for subsequent rolling and forming.

[0050] See also Figure 1-Figure 3 The positioning member includes two receiving grooves 84 opened on the inner bottom wall of the discharge groove 83, a positioning plate 85 is rotatably connected between the inner walls of the receiving grooves 84, and a spring 86 is fixedly connected between the positioning plate 85 and the bottom wall of the receiving groove 84.

[0051] During use of the present solution, when the plate is continuously conveyed inside the quality inspection piece 8, the plate first squeezes the positioning plate 85 and compresses the spring 86, causing the positioning plate 85 to be received inside the receiving groove 84 under the pressure, and then when one end of the plate hits the side of the limit plate 5, the other end of the plate is just located on one side of the receiving groove 84. As a result, the positioning plate 85 is located on one side of the plate due to the rebound of the spring 86 without being subjected to the pressure, thereby positioning the plate at this time to avoid displacement during subsequent rolling and forming, thereby ensuring accuracy during forming.

[0052] See also Figure 1 and Figure 5-Figure 6 The pressing round member 11 includes a driving box 111 fixedly connected to the lower end of the connecting plate 9, a through hole 112 is opened at the front end of the driving box 111, a pressure rod 113 is fixedly connected to the bottom wall of the through hole 112, a slide rail 114 is fixedly connected to the inner top of the driving box 111, a connecting block 115 is slidably connected to the bottom end of the slide rail 114, a connecting block 115 is fixedly connected to the front end of the connecting block 115, and a connecting block 2 116 is fixedly connected to the front end of the connecting block 2 116. 117, the connecting sleeve 117 is located on the outside of the pressure rod 113, and a motor 118 is installed on the top of the rear side of the driving box 111. The output end of the motor 118 passes through the interior of the driving box 111 and is fixedly connected with a turntable 119. A connecting rod 120 is provided between the turntable 119 and the bottom of the connecting block 115. A transmission seat is movably connected between the connecting rod 120 and the turntable 119 and the connecting block 115, and the transmission seat at the bottom of the turntable 119 is eccentrically arranged.

[0053] During use of the present solution, when the pressure rod 113 presses the sheet to the inside of the two clamping members 4 to be rolled into a round shape, the hydraulic rod 10 drives the connecting plate 9 to drive the pressing member 11 to recover to its initial height as a whole, and the rolled sheet is hooked to the surface of the pressure rod 113. At this time, the turntable 119 is driven by the motor 118 to rotate. Since the transmission seat at the bottom of the turntable 119 is eccentrically set, when the turntable 119 rotates, the linear spacing changes, thereby driving the connecting block 115 sliding at the bottom of the slide rail 114 to simultaneously perform a linear reciprocating displacement operation. As a result, the connecting sleeve 117 can be driven to reciprocate linearly against the sheet that is later hooked and rolled, and the rolled sheet is pushed toward the outside of the pressure rod 113, thereby enabling the rolled tinplate can sheet to be recovered.

[0054] See also Figure 5 The side end of the connecting plate 9 is rotatably connected to the limiting sleeve 91 , and the bottom end of the limiting sleeve 91 is arranged as an arc surface and fits with the surface of the pressure rod 113 .

[0055] During use of this solution, when the plate is rolled on the surface of the pressure rod 113, it can be limited by the limiting sleeve 91 to avoid position deviation during rolling.

[0056] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A tinplate can rolling forming device, comprising a support frame (1), characterized in that: The front end of the support frame (1) is fixedly connected to a base (2), the upper end of the base (2) is fixedly connected to two symmetrically distributed supports (3), the inner side wall of the support (3) is rotatably connected to a clamping piece (4), the two clamping pieces (4) are symmetrically distributed around the same center of a circle, and a motor is installed at the rear end of each of the two clamping pieces. The upper end of the support (3) is fixedly connected to a limit plate (5), and the limit plate (5) is located on the outside of the clamping piece (4). The left end of the support frame (1) is fixedly connected to a connecting seat (6), the upper end of the connecting seat (6) is installed with a quality inspection piece (8), and the left side of the quality inspection piece (8) is installed with a shaping piece (7). The inner top end of the support frame (1) is fixedly connected to a hydraulic rod (10), the telescopic end of the hydraulic rod (10) is fixedly connected to a connecting plate (9), and the bottom end of the connecting plate (9) is installed with a pressing round piece (11); The quality inspection part (8) comprises a quality inspection box (81) fixedly connected to the upper end of the connecting seat (6), the inner bottom end of the quality inspection box (81) is embedded with two symmetrically distributed conveyor belts (82), and the left and right ends of the quality inspection box (81) are both provided with discharge troughs (83), wherein a positioning part is embedded and installed on the inner bottom wall of the right discharge trough (83), and a surface defect detection component is installed between the inner walls of the left discharge trough (83), and a defective product recovery part is embedded and installed on the central side of the inner bottom end of the quality inspection box (81); The surface defect detection component comprises a shaping plate (88) fixedly connected to the upper and lower walls of the left discharge trough (83), an infrared temperature sensor (89) is embedded and installed on the outer surface of the discharge trough (83), and the side of the shaping plate (88) close to the shaping member (7) is arranged as an arc surface.

2. The tinplate can rolling forming equipment according to claim 1, characterized in that: The shaping piece (7) comprises a shaping box (71) fixedly connected to the left side of the quality inspection piece (8); two symmetrically distributed conveyor belts (72) are embedded and installed at the inner bottom end of the shaping box (71); an electric heating plate (73) is embedded and installed at the center side of the inner bottom of the shaping box (71); and the right side end of the shaping box (71) is connected to the quality inspection piece (8).

3. The tinplate can rolling forming equipment according to claim 1, characterized in that: The positioning member comprises two receiving grooves (84) formed on the inner bottom wall of the discharge groove (83); a positioning plate (85) is rotatably connected between the inner walls of the receiving grooves (84); and a spring (86) is fixedly connected between the positioning plate (85) and the bottom wall of the receiving groove (84).

4. The tinplate can rolling forming equipment according to claim 1, characterized in that: The defective product recovery part comprises a telescopic rod (812) installed at the bottom end of the quality inspection box (81), the upper end of the telescopic rod (812) is fixedly connected to a bearing plate (813), the bearing plate (813) and the inner bottom wall of the quality inspection box (81) are in the same horizontal plane, and the top of the quality inspection box (81) is provided with a material taking trough (811).

5. The tinplate can rolling forming equipment according to claim 1, characterized in that: A second positioning plate (87) is fixedly connected to the inner top wall of the right discharge chute (83).

6. The tinplate can rolling forming equipment according to claim 1, characterized in that: The pressing member (11) comprises a driving box (111) fixedly connected to the lower end of the connecting plate (9), a through hole (112) is provided at the front end of the driving box (111), a pressure rod (113) is fixedly connected to the bottom wall of the through hole (112), a slide rail (114) is fixedly connected to the inner top end of the driving box (111), a connecting block 1 (115) is slidably connected to the bottom end of the slide rail (114), a connecting block 2 (116) is fixedly connected to the front end of the connecting block 1 (115), and a connecting sleeve (116) is fixedly connected to the front end of the connecting block 2 (116). 17), the connecting sleeve (117) is located on the outside of the pressure rod (113), a second motor (118) is installed at the top end of the rear side of the driving box (111), the output end of the second motor (118) passes through the interior of the driving box (111) and is fixedly connected to a rotating disk (119), a connecting rod (120) is provided between the rotating disk (119) and the bottom of the connecting block (115), a transmission seat is movably connected between the connecting rod (120) and the rotating disk (119) and the connecting block (115), and the transmission seat at the bottom of the rotating disk (119) is eccentrically arranged.

7. The tinplate can rolling forming equipment according to claim 6, characterized in that: The side end of the connection plate (9) is rotatably connected to a limiting sleeve (91), and the bottom end of the limiting sleeve (91) is arranged in an arc surface and fits with the surface of the pressure rod (113).

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