CN112427473A

CN112427473A - Automatic cold extrusion equipment is used in shock absorber piston rod processing

Info

Publication number: CN112427473A
Application number: CN202011378401.2A
Authority: CN
Inventors: 甄超; 方诗林
Original assignee: Dongguan Meinengda Automation Technology Co ltd
Current assignee: Dongguan Meinengda Automation Technology Co ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-03-02

Abstract

The invention discloses automatic cold extrusion equipment for machining a piston rod of a shock absorber, which comprises a workbench, a protective bottom pad and a cross rod, wherein a connecting plate is fixedly connected at the central position of the top end of the workbench, a limiting plate is fixedly connected at the top end of the connecting plate, a groove body is arranged in the limiting plate, an inclined plate is fixedly connected at one side of the connecting plate, the bottom end of the inclined plate is fixedly connected with the top end of the workbench, the bottom end of the cross rod is fixedly connected with the shell, and a cavity is arranged in the shell, and a material receiving mechanism is arranged on one side of the workbench, so that the invention not only realizes the limiting function when the automatic cold extrusion equipment for machining the piston rod of the shock absorber is used, but also realizes the function of convenient material receiving when the automatic cold extrusion equipment for machining the piston rod of the shock absorber is used, and the function that the extrusion head is convenient to replace when the automatic cold extrusion equipment for machining the piston rod of the shock absorber is used is realized.

Description

Automatic cold extrusion equipment is used in shock absorber piston rod processing

Technical Field

The invention relates to the technical field of a piston rod of a shock absorber, in particular to automatic cold extrusion equipment for machining the piston rod of the shock absorber.

Background

Along with the continuous development of society, the development of all walks of life is also faster and faster, wherein cold extrusion is a kind of equipment that carries out moulding change to the metal, it can carry out the deformation to the molding of metal when using for it becomes the molding that we need, cold extrusion is the product of recent times simultaneously, people can only carry out cold extrusion to a small number earlier, the metal that can handle along with the progress of times is more, simultaneously this kind of automatic cold extrusion equipment for shock absorber piston rod processing on the market is various now, can satisfy people's user demand basically, but still has certain problem.

Traditional this kind of automatic cold extrusion equipment is used in bumper shock absorber piston rod processing is because inconvenient automatic unloading when this automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod when using, it is extremely inconvenient when using to make this automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod, simultaneously automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod because its inconvenient receipts material when using, it is low to make this automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod practicality when using, at last this automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod because its extrusion head is inconvenient to be changed when using, make this automatic cold extrusion equipment is used in the processing of bumper shock absorber piston rod bring very big trouble for the user when using.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides automatic cold extrusion equipment for machining a piston rod of a shock absorber, which has the advantages of automatic discharging function of the automatic cold extrusion equipment, convenience in material collection and convenience in replacement of an extrusion head, and solves the problems that the existing device is inconvenient in automatic discharging, inconvenient in material collection and inconvenient in replacement of the extrusion head.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: an automatic cold extrusion device for machining a piston rod of a shock absorber comprises a workbench, a protective bottom cushion and a cross rod, wherein a connecting plate is fixedly connected to the central position of the top end of the workbench, a limiting plate is fixedly connected to the top end of the connecting plate, a groove body is arranged inside the limiting plate, an inclined plate is fixedly connected to one side of the connecting plate, the bottom end of the inclined plate is fixedly connected with the top end of the workbench, vertical rods are fixedly connected to the corner positions of the top end of the workbench, the surface of the bottom end of each vertical rod is sleeved with the protective bottom cushion, a bearing rod is fixedly connected to the top end of each vertical rod, a second through cavity is arranged inside each bearing rod, a first through cavity is arranged at the bottom end of each bearing rod, a push cylinder is fixedly connected to the top end of each second through cavity, the bottom end of each push cylinder extends to the outside of the corresponding first through, the top end of the cross rod is fixedly connected with the output end of the pushing cylinder, the bottom end of the cross rod is fixedly connected with a shell, a cavity is arranged in the shell, an extrusion head is arranged in the cavity, both sides of the extrusion head are respectively provided with a dismounting mechanism, the corner positions of the cross rod are respectively fixedly connected with a loop bar, the loop bars are respectively sleeved with a vertical rod, the connecting plate and the top end of the protective base pad are fixedly connected with a base rod, the top end of the base rod is fixedly connected with a limiting mechanism, the limiting mechanism comprises a connecting spring, a first connecting rod, a second connecting rod, a telescopic cavity, a push block, a slide rail, a slide block and a third connecting rod, the top end of the first connecting rod is fixedly connected with the bottom end of the loop bar, a connecting spring is fixedly connected between the first connecting rods, the bottom end of the first connecting rod is movably connected with the third connecting rod, and the other end, the telescopic cavity is sleeved on the outer side of the second connecting rod, a pushing block is fixedly connected to one side of the telescopic cavity, a sliding block is fixedly connected to the bottom end of the pushing block, a sliding rail is arranged below the sliding block and arranged on the surface of the bottom rod, and a material receiving mechanism is arranged on one side of the workbench.

Preferably, receiving agencies includes bottom plate, down tube, receipts flitch, curb plate, guard plate, protection spring, inner chamber, joint spring, baffle and joint groove, the lateral wall swing joint of one side of receiving the flitch and workstation, the top fixedly connected with curb plate of receiving the flitch, the bottom swing joint of receiving the flitch has the down tube, and the below of down tube is provided with the bottom plate, the inside of bottom plate is provided with the joint groove.

Preferably, the inside both sides of curb plate all are provided with the guard plate, and the both sides of guard plate all fixedly connected with protection spring, protection spring's the other end all with the lateral wall fixed connection of curb plate.

Preferably, the inside in joint groove is provided with the inner chamber, and the bottom fixedly connected with joint spring of inner chamber, and the top fixedly connected with baffle of joint spring, the top of baffle extends to the outside of inner chamber.

Preferably, the inner cavity and the clamping groove are integrally designed with the bottom plate, and one side of the bottom plate is fixedly connected with the side wall of the workbench.

Preferably, the outer diameter of the slide rail is larger than the inner diameter of the slide block, and the slide rail is in sliding connection with the slide block.

Preferably, tear open and trade the mechanism and include push rod, joint piece, recess and reset spring, the recess sets up in the inside of casing and extrusion head, fixedly connected with reset spring on the inner wall of recess, and one side fixedly connected with joint piece of reset spring, the both sides of joint piece are fixedly connected with push rod all.

Preferably, the push rods are symmetrically distributed on the center line of the clamping block, and the clamping block is sleeved with the groove.

Preferably, the push rod and the clamping block are in an integrated molding design, and the grooves are symmetrically distributed on the surface of the extrusion head.

Preferably, the cavity and the shell are in an integrated molding design, and the shell is in a convex design.

(III) advantageous effects

Compared with the prior art, the invention provides automatic cold extrusion equipment for machining the piston rod of the shock absorber, which has the following beneficial effects:

1. through when loop bar downstream, it can be under the effect of first connecting rod, third connecting rod and second connecting rod, release the ejector pad, the ejector pad can carry out spacing regulation to the inside material of cell body this moment, avoid the phenomenon that it appeared the skew when the material was loaded, when the loop bar rose, it can be by reverse playback, spacing function when having realized this bumper shock absorber piston rod processing uses automatic cold extrusion equipment, thereby the degree of automation when having improved this bumper shock absorber piston rod processing uses automatic cold extrusion equipment.

2. The material can reach the top of receiving the flitch through the swash plate during use, after receiving the flitch and collecting abundant material, with separation between down tube and the joint groove, the downward rotation of flitch will be received this moment, the person of facilitating the use collects the material of receiving flitch surface, later reset down tube and joint groove, press the baffle this moment, it can reach the inside of inner chamber, after the down tube reachs suitable position department again, the baffle can reset under the elastic action of joint spring, it can carry out spacing joint to the down tube, the function of being convenient for receive the material when having realized this automatic cold extrusion equipment for shock absorber piston rod processing uses, thereby the convenient degree when having improved this automatic cold extrusion equipment for shock absorber piston rod processing uses.

3. Through promoting the push rod, it can push away the joint piece to the inside groove position department of extrusion head, the extrusion head can be taken off this moment, and change and maintain it, later reset it again, and loosen the push rod, the joint piece can be under reset spring's elastic action this moment, with the inside recess looks joint of casing, made things convenient for the extrusion head to tear open when using and trade, the function that the extrusion head is convenient for to change when having realized this automatic cold extrusion equipment for shock absorber piston rod processing uses, thereby the practicality when this automatic cold extrusion equipment for shock absorber piston rod processing uses has been improved.

Drawings

FIG. 1 is a schematic structural view of an automatic cold extrusion device for machining a piston rod of a shock absorber according to the present invention;

FIG. 2 is a schematic structural view of a front cross section of the automatic cold extruding device for machining the piston rod of the shock absorber, which is provided by the invention;

FIG. 3 is a schematic view of a material receiving mechanism of the automatic cold extrusion device for machining the piston rod of the shock absorber, which is provided by the invention, from a top view;

FIG. 4 is an enlarged structural schematic view of a part of a section A in FIG. 2 of the automatic cold extruding apparatus for machining a piston rod of a shock absorber according to the present invention;

FIG. 5 is a schematic view of a cross bar of the automatic cold extrusion device for machining a piston rod of a shock absorber according to the present invention;

FIG. 6 is an enlarged structural schematic view of a part of a section B in FIG. 5 of the automatic cold extruding device for machining the piston rod of the shock absorber, according to the present invention;

fig. 7 is a schematic view of a partial structure of a limiting mechanism of automatic cold extrusion equipment for machining a piston rod of a shock absorber, which is provided by the invention.

In the figure: 1. a work table; 101. erecting a rod; 2. a material receiving mechanism; 201. a base plate; 202. a diagonal bar; 203. a material collecting plate; 204. a side plate; 205. a protection plate; 206. a guard spring; 207. an inner cavity; 208. clamping a spring; 209. a partition plate; 210. a clamping groove; 3. a protective base pad; 4. a sloping plate; 5. a loop bar; 6. a limiting plate; 7. a load-bearing bar; 8. a first through cavity; 9. a cross bar; 10. a limiting mechanism; 1001. a connecting spring; 1002. a first link; 1003. a second link; 1004. a telescoping chamber; 1005. a push block; 1006. a slide rail; 1007. a slider; 1008. a third link; 11. a bottom bar; 12. a connecting plate; 13. a push cylinder; 14. a second through cavity; 15. an extrusion head; 16. a trough body; 17. a housing; 18. disassembling and replacing the mechanism; 1801. a push rod; 1802. a clamping block; 1803. a groove; 1804. a return spring; 19. a cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Referring to fig. 1-7, an automatic cold extrusion device for machining a piston rod of a shock absorber comprises a workbench 1, a protective bottom pad 3 and a cross rod 9, wherein a connecting plate 12 is fixedly connected to the center position of the top end of the workbench 1, a limiting plate 6 is fixedly connected to the top end of the connecting plate 12, a groove 16 is arranged inside the limiting plate 6, an inclined plate 4 is fixedly connected to one side of the connecting plate 12, the bottom end of the inclined plate 4 is fixedly connected to the top end of the workbench 1, vertical rods 101 are fixedly connected to the corner positions of the top end of the workbench 1, the protective bottom pad 3 is sleeved on the surfaces of the bottom ends of the vertical rods 101, a bearing rod 7 is fixedly connected to the top end of each vertical rod 101, a second through cavity 14 is arranged inside the bearing rod 7, a first through cavity 8 is arranged at the bottom end of the bearing rod 7, a pushing cylinder 13 is fixedly connected to the top end of the second through cavity 14, and, the below of propelling movement cylinder 13 is provided with horizontal pole 9, and the top of horizontal pole 9 and propelling movement cylinder 13's output fixed connection, the bottom fixedly connected with casing 17 of horizontal pole 9, and the inside of casing 17 is provided with cavity 19.

The cavity 19 and the shell 17 are integrally formed, and the shell 17 is in a convex design, so that the extrusion head 15 is convenient to use.

The interior of the cavity 19 is provided with an extrusion head 15, and both sides of the extrusion head 15 are provided with a dismounting mechanism 18.

The dismounting mechanism 18 comprises a push rod 1801, a clamping block 1802, a groove 1803 and a return spring 1804, the groove 1803 is arranged inside the casing 17 and the extrusion head 15, the return spring 1804 is fixedly connected to the inner wall of the groove 1803, the clamping block 1802 is fixedly connected to one side of the return spring 1804, and the push rod 1801 is fixedly connected to two sides of the clamping block 1802.

Push rod 1801 is the symmetric distribution on the central line of joint piece 1802, joint piece 1802 cup joints with recess 1803 mutually, push rod 1801 is the integrated into one piece design with joint piece 1802, recess 1803 is the symmetric distribution on extrusion head 15's surface, when using this mechanism, at first, promote push rod 1801, it can push away joint piece 1802 to extrusion head 15 inside recess 1803 position department, extrusion head 15 can be taken off this moment, and change and maintain it, later reset it again, and loosen push rod 1801, joint piece 1802 can be under reset spring 1804's elastic action this moment, with casing 17 inside recess 1803 looks joint, it is convenient for extrusion head 15 to tear open when using and change.

The corner positions of the cross rod 9 are fixedly connected with loop bars 5, the loop bars 5 are sleeved with upright rods 101, the top ends of the connecting plates 12 and the protective base mats 3 are fixedly connected with base rods 11, the top ends of the base rods 11 are fixedly connected with limiting mechanisms 10, each limiting mechanism 10 comprises a connecting spring 1001, a first connecting rod 1002, a second connecting rod 1003, a telescopic cavity 1004, a pushing block 1005, a sliding rail 1006, a sliding block 1007 and a third connecting rod 1008, the top ends of the first connecting rods 1002 are fixedly connected with the bottom ends of the loop bars 5, the connecting springs 1001 are fixedly connected between the first connecting rods 1002, the bottom ends of the first connecting rods 1002 are movably connected with the third connecting rod 1008, the other ends of the third connecting rods 1008 are movably connected with the second connecting rod 1008, the telescopic cavity 1003 is sleeved on the outer side of the second connecting rod 1003, the pushing block 1005 is fixedly connected with one side of the telescopic cavity 1004, the sliding block 1007 is fixedly connected with the bottom end of the pushing block, and the slide rail 1006 is provided on the surface of the bottom bar 11.

The external diameter of slide rail 1006 is greater than the internal diameter of slider 1007, is sliding connection between slide rail 1006 and the slider 1007, and when using this mechanism, at first, when loop bar 5 moves down, it can be under the effect of first connecting rod 1002, third connecting rod 1008 and second connecting rod 1003, release ejector pad 1005, ejector pad 1005 can carry out spacing regulation to the inside material of cell body 16 this moment, avoids its phenomenon that the skew appears when the material loading, and when loop bar 5 rose, it can be reversed and reset.

One side of workstation 1 is provided with receiving agencies 2, receiving agencies 2 includes bottom plate 201, down tube 202, receive flitch 203, curb plate 204, guard plate 205, protection spring 206, inner chamber 207, joint spring 208, baffle 209 and joint groove 210, receive one side of flitch 203 and workstation 1's lateral wall swing joint, receive the top fixedly connected with curb plate 204 of flitch 203, receive the bottom swing joint of flitch 203 and have down tube 202, and the below of down tube 202 is provided with bottom plate 201, the inside of bottom plate 201 is provided with joint groove 210.

When the mechanism is used, firstly, materials reach the top end of the material receiving plate 203 through the inclined plate 4, after enough materials are collected by the material receiving plate 203, the inclined rod 202 is separated from the clamping groove 210, at the moment, the material receiving plate 203 rotates downwards, and a user can conveniently collect the materials on the surface of the material receiving plate 203, then, the inclined rod 202 and the clamping groove 210 are reset, the partition plate 209 is pressed at the moment and can reach the inner part of the inner cavity 207, and after the inclined rod 202 reaches a proper position, the partition plate 209 can reset under the elastic action of the clamping spring 208 and can limit and clamp the inclined rod 202.

The working principle is as follows: this embodiment pushes away push rod 1801 at first, and it can push away joint piece 1802 to extrusion head 15 inside recess 1803 position department, and extrusion head 15 can be taken off this moment to change and maintain it, later reset it again, and loosen push rod 1801, and joint piece 1802 can be under the elastic action of reset spring 1804 this moment, with the inside recess 1803 looks joint of casing 17, has made things convenient for extrusion head 15 to tear open when using and has changed.

Secondly, the pushing cylinder 13 inside the second through cavity 14 is controlled to work, the pushing cylinder can push the cross rod 9 to descend, the extrusion head 15 can be connected with the material on the surface of the groove body 16 and carries out cold extrusion treatment, at the moment, when the loop bar 5 moves downwards, the pushing block 1005 is pushed out under the action of the first connecting rod 1002, the third connecting rod 1008 and the second connecting rod 1003, the pushing block 1005 can limit and adjust the material inside the groove body 16 at the moment, the phenomenon of offset of the pushing block when the material is loaded is avoided, and when the loop bar 5 returns, the pushing block can be reversely returned.

Finally, the material can reach the top end of the material receiving plate 203 through the inclined plate 4, after the material receiving plate 203 collects enough material, the inclined rod 202 is separated from the clamping groove 210, the material receiving plate 203 rotates downwards at the moment, a user can collect the material on the surface of the material receiving plate 203 conveniently, then the inclined rod 202 and the clamping groove 210 reset, the partition plate 209 is pressed at the moment, the inclined rod can reach the inside of the inner cavity 207, and after the inclined rod 202 reaches a proper position, the partition plate 209 can reset under the elastic action of the clamping spring 208, and the inclined rod 202 can be limited and clamped.

It is to be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or operations, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus, without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a processing of bumper shock absorber piston rod is with automatic cold extrusion equipment, includes workstation (1), protection heelpiece (3) and horizontal pole (9), its characterized in that: the center position of the top end of the workbench (1) is fixedly connected with a connecting plate (12), the top end of the connecting plate (12) is fixedly connected with a limiting plate (6), a groove body (16) is arranged in the limiting plate (6), one side of the connecting plate (12) is fixedly connected with an inclined plate (4), the bottom end of the inclined plate (4) is fixedly connected with the top end of the workbench (1), corner positions of the top end of the workbench (1) are fixedly connected with vertical rods (101), the surfaces of the bottom ends of the vertical rods (101) are sleeved with protective base cushions (3), the top end of the vertical rod (101) is fixedly connected with a bearing rod (7), a second through cavity (14) is arranged in the bearing rod (7), the bottom end of the bearing rod (7) is provided with a first through cavity (8), and the top end of the second through cavity (14) is fixedly connected with a pushing cylinder (13), and the bottom of propelling movement cylinder (13) extends to the outside of first logical chamber (8), the below of propelling movement cylinder (13) is provided with horizontal pole (9), and the top of horizontal pole (9) and the output fixed connection of propelling movement cylinder (13), the bottom fixedly connected with casing (17) of horizontal pole (9), and the inside of casing (17) is provided with cavity (19), the inside of cavity (19) is provided with extrusion head (15), and the both sides of extrusion head (15) all are provided with and tear mechanism (18) open, the corner position department of horizontal pole (9) all fixedly connected with loop bar (5), and loop bar (5) all cup joint with pole setting (101) mutually, top fixedly connected with sill bar (11) of connecting plate (12) and protection sill pad (3), and the top fixedly connected with stop gear (10) of sill bar (11), stop gear (10) are including connecting spring (1001), A first connecting rod (1002), a second connecting rod (1003), a telescopic cavity (1004), a push block (1005), a slide rail (1006), a slide block (1007) and a third connecting rod (1008), the top end of the first connecting rod (1002) is fixedly connected with the bottom end of the loop bar (5), a connecting spring (1001) is fixedly connected between the first connecting rods (1002), the bottom end of the first connecting rod (1002) is movably connected with a third connecting rod (1008), the other end of the third connecting rod (1008) is movably connected with a second connecting rod (1003), a telescopic cavity (1004) is sleeved on the outer side of the second connecting rod (1003), a push block (1005) is fixedly connected to one side of the telescopic cavity (1004), the bottom end of the push block (1005) is fixedly connected with a slide block (1007), a slide rail (1006) is arranged below the slide block (1007), and the slide rail (1006) is arranged on the surface of the bottom rod (11), and one side of the workbench (1) is provided with a material receiving mechanism (2).

2. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 1, wherein: receiving agencies (2) are including bottom plate (201), down tube (202), receipts flitch (203), curb plate (204), guard plate (205), protection spring (206), inner chamber (207), joint spring (208), baffle (209) and joint groove (210), the lateral wall swing joint of one side and workstation (1) of receipts flitch (203), the top fixedly connected with curb plate (204) of receipts flitch (203), the bottom swing joint of receipts flitch (203) has down tube (202), and the below of down tube (202) is provided with bottom plate (201), the inside of bottom plate (201) is provided with joint groove (210).

3. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 2, wherein: the inside both sides of curb plate (204) all are provided with guard plate (205), and the both sides of guard plate (205) all fixedly connected with protection spring (206), the other end of protection spring (206) all with the lateral wall fixed connection of curb plate (204).

4. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 2, wherein: the inside in joint groove (210) is provided with inner chamber (207), and the bottom fixedly connected with joint spring (208) of inner chamber (207), and the top fixedly connected with baffle (209) of joint spring (208), the top of baffle (209) extends to the outside of inner chamber (207).

5. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 2, wherein: inner chamber (207) and joint groove (210) all are the integration with bottom plate (201) and are the type design, one side of bottom plate (201) and the lateral wall fixed connection of workstation (1).

6. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 1, wherein: the outer diameter of the sliding rail (1006) is larger than the inner diameter of the sliding block (1007), and the sliding rail (1006) is in sliding connection with the sliding block (1007).

7. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 1, wherein: tear open and trade mechanism (18) and include push rod (1801), joint piece (1802), recess (1803) and reset spring (1804), recess (1803) set up in the inside of casing (17) and extrusion head (15), fixedly connected with reset spring (1804) on the inner wall of recess (1803), and one side fixedly connected with joint piece (1802) of reset spring (1804), the both sides of joint piece (1802) are fixedly connected with push rod (1801).

8. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 7, wherein: the push rods (1801) are symmetrically distributed on the center line of the clamping block (1802), and the clamping block (1802) is sleeved with the groove (1803).

9. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 7, wherein: the push rod (1801) and the clamping block (1802) are designed in an integrated forming mode, and the grooves (1803) are symmetrically distributed on the surface of the extrusion head (15).

10. The automatic cold extrusion device for machining the piston rod of the shock absorber as claimed in claim 1, wherein: the cavity (19) and the shell (17) are in an integrated molding design, and the shell (17) is in a convex design.