Equipment for cleaning vulcanizing mold

Abstract

The utility model discloses equipment for cleaning a vulcanization mold, which comprises a mold conveying device and a mold lifting device, the mold conveying device can be used for conveying the mold to a first preset position, and the mold lifting device can be used for lifting an upper mold of the mold to a second preset position; the die overturning device comprises a bearing seat and an overturning rack; the bearing seat is arranged on the overturning rack; the bearing seat is fixed to the mold lifting device, and a rotating shaft capable of rotating by 360 degrees is supported on the bearing seat. And the overturning machine frame can contain and fix an upper mold of the mold, the overturning machine frame can overturn by 180 degrees around a rotating shaft, and after the upper mold of the mold is lifted to a second preset position, the upper mold of the mold overturning device can be overturned by 180 degrees so that an upper mold cavity can be cleaned.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rubber products mold cleaning equipment technical field, more specifically relates to a kind of equipment for vulcanization mold cleaning. BACKGROUND

[0002] At present, the precision rubber mold needs to be cleaned during production process due to sticking, mainly two cleaning modes: one is dry cleaning, i.e. laser cleaning, but frequent use of laser to clean the mold cavity can cause the surface coating of the mold cavity to fall off and damage the mold, which can affect the size of the precision rubber product over time. The other is water washing, i.e. spraying liquid solvent to the surface of the mold cavity to produce a chemical reaction, then washing the cavity with a brush, and then flushing the mold cavity with a high-pressure water gun connected to soft water.

[0003] The second cleaning method is commonly used in the industry. Traditional water washing requires the assistance of two mold cleaning workers to complete the operation, which is time-consuming and labor-intensive. During the mold disassembly and assembly process, if one side of the operation is not handled properly, it can cause the mold to fall and scratch the mold cavity, and in severe cases, it can cause personal injury.

[0004] After searching, it was found that a utility model patent document (authorized publication number CN217990175U) disclosed a mold cleaning tool, including guide rails, traction modules, clamping rotary modules and cleaning modules. The mold to be cleaned is transported to the rotary clamping module by the traction module supporting the bearing tray. The clamping cylinder is driven by the rotary cylinder to rotate the clamping cylinder. The clamping cylinder drives the clamping jaw unit to clamp the mold to be cleaned. Then the traction module moves away. The cleaning pump of the cleaning module is driven by the cleaning motor to spray the cleaning liquid in the cleaning liquid tank to clean both sides of the mold. After cleaning is completed, the traction module returns to the rotary clamping module to transport the cleaned mold out. This device saves the manual handling and turning during the cleaning process, and has high cleaning efficiency.

[0005] In the above technical solution, two sets of rotary clamping modules 3 are symmetrically arranged on both sides of the mold, and the mold is rotated in the vertical plane by the two sets of clamping jaw units 34 and the two sets of rotary cylinders 32. It may be prone to the problem of asynchronous rotation of the two sides. If it cannot be turned synchronously, the mold may be damaged during the cleaning process. UTILITY MODEL CONTENTS

[0006] 1. Technical problem to be solved by the utility model

[0007] The utility model aims to provide another technical solution for the equipment for vulcanization mold cleaning, which can greatly reduce labor intensity, and only one person is needed to complete the mold cleaning operation, effectively avoiding the risk of bumping the mold cavity, and reducing the probability of human operation errors.

[0008] 2. Technical solution

[0009] To achieve the above object, the utility model provides the following technical scheme:

[0010] A kind of equipment for vulcanization mould cleaning of the utility model, including mould conveying device and mould lifting device, the mould conveying device can be used to send mould to first predetermined position, the mould lifting device can be used to lift the upper die of mould to second predetermined position;It further includes mould turnover device, after the upper die of mould is lifted to second predetermined position, the mould turnover device can overturn the upper die of mould 180 degrees, to clean the upper die of mould;

[0011] The mould turnover device includes bearing seat and turnover frame;

[0012] The bearing seat is fixed to the mould lifting device, and a rotating shaft that can rotate 360 degrees is supported on the bearing seat;

[0013] The turnover frame can accommodate the upper die of fixed mould, and the turnover frame can be overturned 180 degrees around the rotating shaft.

[0014] Further, the mould turnover device further includes a second pneumatic mechanism, a cylinder joint is provided on the second pneumatic mechanism, and starting the second pneumatic mechanism can make the cylinder joint away from or close to the upper die of mould.

[0015] Further, the cylinder joint is configured as a high-quality stamping round plate.

[0016] Further, the turnover frame adopts U-shaped steel.

[0017] Further, the upper and lower gap of the U-shaped steel is 10 cm.

[0018] Further, a push rod is provided on the back side of the turnover frame

[0019] Further, a limit module is provided on the front side of the turnover frame.

[0020] Further, the mould conveying device includes a positioning suction magnetic strip, which is provided at the rear end of the mould conveying device and can adsorb the mould when it is about to reach the first predetermined position.

[0021] Further, the mould lifting device includes a lifting frame, a main support frame, a main load-bearing member, a vice support guide rod, a vice load-bearing member and a first pneumatic mechanism.

[0022] The main support frame is two, respectively arranged at the rear end of the long lifting frame two sides;

[0023] The main load-bearing parts are two, which are arranged in the main support frame respectively, used for supporting the upper die of the mold, and the main load-bearing parts can move up and down along the main support frame; the main load-bearing parts are fixedly connected with the lifting frame;

[0024] The auxiliary support guide rods are two, which are arranged at the two sides of the front end of the lifting frame respectively;

[0025] The auxiliary load-bearing parts are two, which are movably connected with the auxiliary support guide rods respectively, used for supporting the upper die of the mold, the auxiliary load-bearing parts can move up and down along the auxiliary support guide rods, and the auxiliary load-bearing parts are fixedly connected with the lifting frame;

[0026] The first pneumatic mechanism can drive the main load-bearing parts and the auxiliary load-bearing parts to move up and down synchronously.

[0027] Further, the mold lifting device further comprises an induced check valve and a pneumatic regulating valve installed at the inlet and outlet of the cylinder.

[0028] 3. Beneficial effects

[0029] Compared with the prior art, the technical scheme has the following beneficial effects:

[0030] (1) The equipment for cleaning the vulcanization mold of the utility model, including mold conveying device and mold lifting device, the mold conveying device can be used to send the mold to the first predetermined position, the mold lifting device can be used to lift the upper die of the mold to the second predetermined position; further including mold turnover device, the mold turnover device includes bearing seat and turnover frame; the bearing seat is fixed to the mold lifting device, the bearing seat supports the rotating shaft which can rotate 360 degrees; the turnover frame can accommodate the upper die of the fixed mold, the turnover frame can overturn 180 degrees around the rotating shaft, after lifting the upper die of the mold to the second predetermined position, the upper die of the mold turnover device can be overturned 180 degrees, so as to clean the upper die cavity.

[0031] (2) The equipment for cleaning the vulcanization mold of the utility model, the turnover device further includes a second pneumatic mechanism, the second pneumatic mechanism is provided with a cylinder joint, the cylinder joint is configured with a high-quality stamping round plate, in the process of mold lifting and turnover, the contact area of the cylinder joint and the upper die of the mold can be increased, the supporting and fixing effect of the cylinder joint on the mold is improved, and it is ensured that the mold will not fall off.

[0032] (3) The utility model discloses a kind of equipment for vulcanization mould cleaning, the front side of turnover frame is provided with push rod, when the upper die of mould is lifted to second predetermined position, if operator forgets to remove lower die from first predetermined position, push rod can push lower die away from first predetermined position in the process of upper die turnover, prevent upper and lower die knock and cause mould core damage;The rear side of turnover frame is also provided with limiting module, the lower surface of the limiting module is supported on lifting frame before turnover, after turnover 180 degrees, the upper surface of limiting module is supported on lifting frame, so that turnover frame can be kept horizontal before and after turnover.

[0033] (4) The utility model discloses a kind of equipment for vulcanization mould cleaning, the mould conveying device further includes positioning suction magnetic strip and baffle, the positioning suction magnetic strip is close to the baffle, when mould is about to reach first predetermined position, it can be adsorbed, prevent due to inertia and cause mould rebound so that mould cannot be accurately positioned in first predetermined position.

[0034] (5) The utility model discloses a kind of equipment for vulcanization mould cleaning, the mould lifting device includes lifting frame, main support frame, main bearing, vice support guide rod, vice bearing and first pneumatic mechanism, can make that mould lifting process is balanced smooth, without shaking;The mould lifting device further includes inducing check valve and pneumatic regulating valve installed at the inlet and outlet of cylinder, the inducing check valve can maintain the working state of cylinder when air source fails, air pipe breaks etc. BRIEF DESCRIPTION OF DRAWINGS

[0035] Fig. 1 It is the overall structure schematic diagram of the equipment for vulcanization mould cleaning of the utility model;

[0036] Fig. 2 It is the conveying device structure schematic diagram of the equipment for vulcanization mould cleaning of the utility model;

[0037] Fig. 3 It is the lifting device structure schematic diagram of the equipment for vulcanization mould cleaning of the utility model;

[0038] Fig. 4 It is the turnover device structure schematic diagram of the equipment for vulcanization mould cleaning of the utility model.

[0039] Explanation of reference numerals in the schematic diagram: 1, mold conveying device, 10, positioning block, 11, mold lowering mechanism, 12, channel steel, 13, connecting rod, 14, rolling bearing, 15, limit channel steel, 16, chamfer module, 17, guide rail bearing, 18, positioning suction magnetic strip, 19, baffle, 2, mold lifting device, 20, lifting frame, 21, first pneumatic mechanism, 22, first pneumatic handle, 23, main support frame, 24, main load-bearing member, 25, auxiliary support guide rod, 26, auxiliary load-bearing member, 27, side guard plate, 28, check valve, 29, pneumatic pressure regulating valve, 3, mold overturning device, 31, second pneumatic mechanism, 32, second pneumatic handle, 33, bearing seat, 34, overturning frame, 35, air cylinder joint, 36, limiting module, 37, push rod, 4, bottom plate. DETAILED DESCRIPTION

[0040] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings and examples.

[0041] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification and do not define the limiting conditions for the implementation of the present application, so they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "front", "back", "left", "right" and the like used in the specification are only for the convenience of clear description, and are not used to limit the scope of implementation. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of implementation of the present application.

[0042] For the sake of description, it is assumed that the direction of movement of the mold from the guide rail bearing 17 to the first predetermined position is forward.

[0043] Reference Figs. 1 to 4 The present application discloses a device for cleaning a vulcanization mold, which comprises a mold conveying device 1 and a mold lifting device 2. The mold conveying device 1 is used to deliver the mold to a first predetermined position, and the mold lifting device 2 is used to lift the upper mold of the mold to a second predetermined position. The device further comprises a mold overturning device 3, which can overturn the upper mold of the mold by 180 degrees after the upper mold is lifted to the second predetermined position, so as to clean the upper mold cavity.

[0044] The mold overturning device 3 comprises a bearing seat 33 and an overturning frame 34; the bearing seat 33 is fixed on the mold lifting device 2, and a rotating shaft capable of rotating by 360 degrees is arranged on the bearing seat 33; the overturning frame 34 can accommodate the upper mold of the fixed mold, and the overturning frame 34 can overturn by 180 degrees around the rotating shaft.

[0045] Preferably, the bearing seat 33 is a vertical bearing seat, which is fixedly arranged on the left and right sides of the lifting frame 20 and can be fixedly connected by bolts or other forms. The vertical bearing seat plays a supporting rotating role in the mold overturning process, is resistant to damage and corrosion, and has strong supporting capacity. A rotating shaft capable of rotating by 360 degrees is arranged in the bearing seat, and the overturning frame 34 can overturn by 180 degrees around the rotating shaft.

[0046] The overturning frame 34 adopts high-strength U-shaped steel, and the upper and lower gaps of the U-shaped steel are 10 cm, that is, the waist width of the U-shaped steel is 10 cm, that is, the width between the upper and lower sidewalls of the U-shaped steel. The width of 10 cm is mainly reserved to solve the problem of different thicknesses of the upper mold of the mold. If the upper mold of the mold is too thick, the upper mold may not be accommodated in the overturning frame 34. However, if the upper mold of the mold is relatively thin, after the overturning frame 34 accommodates the upper mold of the mold, there will be a certain gap between the overturning frame and the upper surface of the upper mold of the mold in the vertical direction, thereby affecting the stability of the upper mold during lifting or overturning.

[0047] In order to solve the above problem, the mold overturning device 3 is further provided with a second pneumatic mechanism 31, a cylinder joint 35 is installed on the second pneumatic mechanism 31, and the second pneumatic mechanism 31 can be started through a second pneumatic handle 32 to make the cylinder joint 35 away from or close to the upper mold of the mold. Preferably, the cylinder joint 35 is configured as a high-quality stamping round plate, which increases the contact surface and improves the supporting strength, so that the mold will not fall off during overturning.

[0048] When the overturning frame accommodating the upper mold of the mold needs to be lifted or overturned, the pneumatic handle 32 is simple and convenient to operate, the second pneumatic mechanism 31 is started to make the cylinder joint 35 press-fit on the upper surface of the mold, and the upper mold of the mold is fixed in the upward and downward directions. When the upper mold of the mold needs to be removed, the second pneumatic mechanism 31 is started again to make the cylinder joint 35 away from the upper mold of the mold.

[0049] Of course, even if there is no gap between the overturning frame 34 and the upper mold accommodated therein, the cylinder joint 35 can also be press-fitted on the upper surface of the upper mold to increase the stability of the upper mold of the mold.

[0050] When the lifting device 2 lifts the upper mold to the second predetermined displacement, the force applied to the turnover device 3 or the upper mold can be directly applied to the turnover device 3 or the upper mold to turn it over by 180 degrees, so that the upper mold cavity faces upward. A set of driving mechanisms can also be provided to automatically realize 180-degree turnover of the turnover device. Such driving devices (not shown in the figure) are conventional techniques in the art and will not be described in detail.

[0051] The front side of the turnover frame 34 is provided with a push rod 37. When the upper mold of the mold is lifted to the second predetermined position, if the operator forgets to move the lower mold away from the first predetermined position, the push rod 37 can push the lower mold away from the first predetermined position as the upper mold is turned over, preventing the upper and lower molds from colliding and causing damage to the mold core. It is conceivable that the height of the second predetermined position should be such that it does not collide with the lower mold during the turnover of the turnover frame 34, and the height of the lower end of the push rod should be lower than the height of the upper surface of the lower mold, so that during the turnover, the push rod can apply a pushing force to the lower mold from the side to push the lower mold away from the first predetermined position.

[0052] At least one side of the left and right sides of the rear side of the turnover frame 34 is provided with a limiting module 36. Before turnover, the lower surface of the limiting module 36 is supported on the lifting frame 20, and after 180-degree turnover, the other surface of the limiting module is supported on the lifting frame, so that the turnover frame 34 can be kept stable horizontally before and after turnover. The bearing seat 33 is fixed on the lifting frame 20, and the shaft center of the rotating shaft provided on the bearing seat 33 has a certain height difference with the horizontal plane of the lifting frame 20. The thickness of the limiting module 36 is equivalent to twice the height difference between the shaft center of the rotating shaft and the horizontal plane of the lifting frame 20. In this case, under the common support of the bearing seat 33 and the limiting module 36, the turnover frame 34 and the upper mold can be kept in a horizontal state before and after turnover, and tilting will not occur.

[0053] The mold conveying device 1 of the utility model includes positioning block 10, mold lower placing mechanism 11, limiting channel steel 15, guide rail bearing 17 and baffle 19; The positioning block 10 can position the transport tool (such as a forklift) carrying the mold, so that the mold is just above the mold lower placing mechanism 11, preventing the transport tool from overshooting and causing damage to the mold; The mold lower placing mechanism includes channel steel 12, connecting rod 13 and rolling bearing 14, the channel steel 12 is inverted on the ground, the upper surface of the channel steel is connected with connecting rod 13, the two sides of connecting rod 13 are connected with rolling bearing 14, after removing the tool for transporting the mold, the mold is carried to the mold lower placing mechanism 11, and can move forward under the rolling of rolling bearing 14, enters the track composed of the limiting channel steel 15 on both sides, and stops until the mold moves to the first predetermined position determined by baffle 19. The guide rail bearing 17 is preferably a rolling bearing, which utilizes the characteristics of bearing rolling to reduce the friction between the guide rail and the mold, and can smoothly move the mold to the first predetermined position during sliding.

[0054] The mold conveying device 1 further comprises a positioning suction magnetic strip 18 which is close to the baffle 19 and can adsorb the mold by magnetic attraction principle when the mold reaches the first predetermined position, so that the mold can be prevented from rebounding and leaving the first predetermined position due to the inertia.

[0055] The mold conveying device 1 further comprises a chamfer module 16 which is located at the rear end of the limiting channel steel 15 and is fixedly connected with the limiting channel steel 16, so that the mold can enter the guide rail smoothly and efficiently when the mold enters the movement track composed of the limiting channel steel 16.

[0056] The mold lifting device 2 comprises a lifting frame 20, a main support frame 23, a main bearing part 24, a vice support guide rod 25, a vice bearing part 26 and a first pneumatic mechanism 21.

[0057] The main support frame 23 is two, which are respectively arranged at the front end of the long lifting frame 20.

[0058] The main bearing part 24 is two, which are respectively arranged in the main support frame 23 and used for supporting the upper die of the mold, and the main bearing part 24 can move up and down along the main support frame 23; the main bearing part 24 is fixedly connected with the lifting frame 20.

[0059] The vice support guide rod 25 is two, which are respectively arranged at the rear end of the lifting frame 20.

[0060] The vice bearing part 26 is two, which are respectively movably connected with the vice support guide rod 25 and used for supporting the upper die of the mold; the vice bearing part 26 can move up and down along the vice support guide rod 25, and the vice bearing part 26 is fixedly connected with the lifting frame 20.

[0061] The first pneumatic mechanism 21 can drive the main bearing part 24 and the vice bearing part to move up and down synchronously.

[0062] The main support frame 23 adopts high-strength channel steel as the main support guide rail, the main bearing part 24 preferably adopts high-load bearing which can bear heavy mold; the vice support guide rod adopts chromium-plated round steel, and the vice bearing part 26 preferably adopts ball bearing which can play an auxiliary supporting role, so that the mold lifting process is balanced and smooth without shaking.

[0063] The mold lifting device 2 further comprises an induced check valve 28 and a pneumatic regulating valve 29 which are installed at the inlet and outlet of the air cylinder; the induced check valve can maintain the current working state of the air cylinder when the air source fails or the air pipe is broken, so that the mold can be prevented from being damaged due to stall during the lifting process; the pneumatic regulating valve can adjust the lifting speed of the air cylinder according to the working condition, and then control the lifting speed of the mold.

[0064] The left and right sides of the mold lifting device 2 are also provided with protective plates 27, which can prevent the risk of damaging the mold lowering action and causing the mold presser to be damaged.

[0065] It should be noted that in order to prevent uneven ground or insufficient bearing capacity, a bottom plate 4 can be laid on the ground, which is 10mm thick and made of 45# steel material, serving as a fixed support. The cleaning equipment can be fixed to the bottom plate 4 to ensure that the entire equipment does not deform.

[0066] Basic working process: The mold is transported to the mold lowering mechanism 11 by the carrying tool, guided by the mold lowering device 11, the mold is sent into the guide rail, a certain force is applied to the mold, and the mold moves forward to the first predetermined position under the bearing of the guide rail bearing 17, and the upper mold of the mold is clamped into the mold turnover frame 35, the second pneumatic handle 32 is started to drive the air cylinder joint 35 on the second pneumatic mechanism 31 to approach and tightly contact the upper mold of the mold, and then the first pneumatic handle 22 is started to drive the first pneumatic mechanism 21 to output power to make the mold lifting device 2 drive the upper mold to move to the second predetermined position, then a turnover force is applied to the mold turnover device 3 to make the upper mold turn over 180 degrees to the upper mold cavity upward, at the same time, the lower mold is moved out of the first predetermined position, and then the first pneumatic handle is operated to make the mold lifting device drive the lower mold to descend to the ground, at this time, the cavities of the upper and lower molds are upward, and the mold is cleaned. After cleaning, the upper mold is lifted to the second predetermined position again, and the lower mold is moved to the first predetermined position, the upper mold is turned over 180 degrees, and then the upper mold is lowered to the first predetermined position, the mold closing of the upper and lower molds is completed, and finally the mold conveying device 1 is used to convey the mold to the mold carrying tool, and the entire cleaning process is completed.

[0067] The above describes the present application and its embodiments in a schematic manner, which is not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. If a person skilled in the art is inspired by it, without departing from the creative purpose of the present application, similar structural modes can be designed without creativity, which belong to the protection scope of the present application.

Claims

1. An apparatus for cleaning of vulcanization moulds, comprising a mould conveying device (1) and a mould lifting device (2), said mould conveying device (1) being operable to convey a mould to a first predetermined position, said mould lifting device being operable to lift an upper mould half of the mould to a second predetermined position; characterized in that, The mold turnover device (3) can overturn the upper mold of the mold by 180 degrees to clean the upper mold of the mold after the upper mold of the mold is lifted to the second predetermined position; The mold turnover device (3) comprises a bearing seat (33) and a turnover frame (34); The bearing seat (33) is fixed on the mold lifting device (2), and a rotating shaft capable of rotating by 360 degrees is arranged on the bearing seat (33); The turnover frame (34) can accommodate the upper mold of the fixed mold, and the turnover frame (34) can be overturned by 180 degrees around the rotating shaft.

2. The apparatus for cleaning of a vulcanization mold according to claim 1, characterized in that, The mold turnover device (3) further comprises a second pneumatic mechanism (31), and a cylinder joint (35) is arranged on the second pneumatic mechanism (31); the second pneumatic mechanism (31) is started to drive the cylinder joint (35) to move away from or close to the upper mold of the mold.

3. The apparatus for cleaning of a vulcanization mold according to claim 2, characterized in that, The cylinder joint (35) is configured as a high-quality stamping disc.

4. The apparatus for cleaning of a vulcanization mold according to claim 1, characterized in that, The turnover frame (34) adopts a U-shaped steel.

5. The apparatus for cleaning of a vulcanization mold according to claim 4, characterized in that, The upper and lower gaps of the U-shaped steel are 10 cm.

6. The apparatus for cleaning of a vulcanization mold according to claim 1, wherein A push rod (37) is arranged on the rear side of the turnover frame (34).

7. The apparatus for cleaning of a vulcanization mold according to claim 1, wherein A limiting module (36) is arranged on the front side of the turnover frame (34).

8. The apparatus for cleaning of a vulcanization mold according to claim 1, wherein The mold conveying device (1) comprises a positioning suction magnetic strip (18) and a baffle (19), the positioning suction magnetic strip (18) is closely attached to the baffle (19), and the positioning suction magnetic strip (18) can adsorb the mold when the mold reaches the first predetermined position.

9. The apparatus for cleaning of a vulcanization mold according to claim 8, characterized in that, The mold lifting device (2) comprises a lifting frame (20), a main support frame (23), a main bearing part (24), a vice support guide rod (25), a vice bearing part (26) and a first pneumatic mechanism (21); The main support frame (23) is provided with two main support frames (23) on the two sides of the front end of the lifting frame (20); The main bearing part (24) is provided with two main bearing parts (24) in the main support frame (23), which is used for supporting the upper mold of the mold, and the main bearing part (24) can move up and down along the main support frame (23); the main bearing part (24) is fixedly connected with the lifting frame (20); The vice support guide rod (25) is provided with two vice support guide rods (25) on the two sides of the rear end of the lifting frame (20); The vice bearing part (26) is provided with two vice bearing parts (26) which are movably connected with the vice support guide rod (25) and are used for supporting the upper mold of the mold; the vice bearing part (26) can move up and down along the vice support guide rod (25), and the vice bearing part (26) is fixedly connected with the lifting frame (20); The first pneumatic mechanism (21) can drive the main bearing part (24) and the vice bearing part (26) to move up and down synchronously.

10. The apparatus for cleaning of a vulcanization mold according to claim 9, characterized in that, The mold lifting device (2) further comprises an induced check valve (28) and a pneumatic regulating valve (29) installed at the inlet and outlet of the cylinder.

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