CN112829180B

CN112829180B - Injection molding system and method for chair armrest

Info

Publication number: CN112829180B
Application number: CN202011634654.1A
Authority: CN
Inventors: 王江林; 王郑兴; 陈育昌
Original assignee: Henglin Home Furnishings Co Ltd
Current assignee: Henglin Home Furnishings Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2023-03-07
Anticipated expiration: 2040-12-31
Also published as: CN112829180A

Abstract

The invention discloses an injection molding system of chair armrests and a molding method thereof, and the injection molding system comprises a gasket discharge device, an injection molding machine and a large manipulator, wherein the injection molding machine comprises a first driving mechanism, a pouring system, a movable mold and a fixed mold which are shown in the figure, the movable mold and the fixed mold are fixedly arranged in the injection molding machine, the large manipulator grabs the gasket from the gasket discharge device and places the gasket on the fixed mold, the first driving mechanism pushes the movable mold to move so as to complete a mold closing process with the fixed mold, and the pouring system completes the injection molding process; this technical scheme adopts small-size manipulator to put the gasket to each station of flitch, then the reuse large-scale manipulator places the gasket on the cover half, can effectively ensure the precision that the gasket was put, simultaneously through the speed of adjustment small-size manipulator and large-scale manipulator, can be unanimous with its control and movable mould cover half compound die time of moulding plastics, and then improved the production efficiency of chair handrail.

Description

Injection molding system and method for chair armrest

Technical Field

The invention relates to the technical field of injection molding, in particular to an injection molding system and a molding method of chair armrests.

Background

With the continuous development of economy and the continuous progress of society, various material consumer goods are provided for the life of people so as to enrich the living standard of people, and a plastic product is one of a plurality of material consumer goods.

It is well known that the cooperation of an injection molding machine and an injection mold is one of the most common ways to manufacture plastic products. Wherein, for the plastic chair armrest which is pre-embedded with the gasket and is assembled and formed, the manufacturing process is as follows: the gasket is embedded into the movable mold or the fixed mold of the injection mold by an operator, then the movable mold and the fixed mold are closed by the injection molding machine, and finally the injection molding machine injects molten liquid into the injection mold to perform pressure maintaining and solidification, so that the gasket is embedded into the chair armrest, and the chair armrest is conveniently assembled and connected with other parts of the chair by means of the embedded gasket.

However, those skilled in the art have found that the following disadvantages exist in the process of embedding the gasket into the moving mold or the fixed mold of the injection mold by the operator during the use process:

1) The speed of manually embedding the gasket is low, and the influence on the production efficiency of the chair armrest is large;

2) And the embedded position of the gasket has errors, so that the qualification rate of chair armrest products is influenced.

Disclosure of Invention

In order to solve the above problems, the present invention aims to overcome the disadvantages of the prior art, and provides an injection molding system and method for a chair armrest, including a large-scale manipulator, where the system can automatically complete the gasket pre-embedding of the chair armrest through the large-scale manipulator, thereby improving the pre-embedding rate of the gasket, reducing the error of the pre-embedding position of the gasket, and improving the qualification rate and production efficiency of the chair armrest product.

In order to achieve the purpose, the invention adopts the following technical scheme:

an injection molding method of chair armrests comprises a gasket discharge device, an injection molding machine and a large manipulator, wherein the injection molding machine comprises a first driving mechanism, a pouring system, a movable mold and a fixed mold, the movable mold and the fixed mold are shown in the figure, the movable mold and the fixed mold are fixedly arranged in the injection molding machine, the large manipulator grabs the gaskets from the gasket discharge device and places the gaskets on the fixed mold, the first driving mechanism pushes the movable mold to move so as to complete a mold closing process with the fixed mold, and the pouring system completes an injection molding process; the method is characterized in that:

the gasket discharging device comprises a first workbench, a vibration feeding device, a small-sized mechanical arm and a discharging plate, wherein the vibration feeding device, the small-sized mechanical arm and the discharging plate are arranged on the first workbench, the vibration feeding device comprises a vibration disc arranged on the workbench and a discharging strip arranged on the vibration disc, two first gasket mounting stations, two second gasket mounting stations, two third gasket mounting stations and two fourth gasket mounting stations are symmetrically distributed on the discharging plate,

the large manipulator further comprises a first cross beam, a second cross beam, a first mounting seat, a first vertical beam and a sucker device, wherein two ends of the first cross beam face to the left and right directions respectively and are fixedly mounted at the top end of the injection molding machine, the second cross beam is mounted on the first cross beam through a left-right moving mechanism, two ends of the second cross beam face to the front and back directions respectively, the first mounting seat is mounted on the second cross beam through a front-back moving mechanism, the first vertical beam is mounted on the first mounting seat through a vertical moving mechanism, the sucker device is rotatably mounted at the bottom of the first vertical beam, and the sucker device is used for sucking a gasket on a discharging plate and placing the gasket on a fixed die and sucking an injection molded chair armrest on a movable die and placing the gasket in a finished product bin;

the method comprises the following specific steps:

the method comprises the following steps: starting a vibrating disk, and conveying the gasket to the discharging strip by the vibrating disk through vibration;

step two: the small manipulator sucks the gasket from the discharging strip and places the gasket on a first gasket mounting station, then continues to suck the gasket from the discharging strip and places the gasket on a second gasket mounting station, then continues to suck the gasket from the discharging strip and places the gasket on a third gasket mounting station, then continues to suck the gasket from the discharging strip and places the gasket on a fourth gasket mounting station, then continues to suck the gasket from the discharging strip and places the gasket on a third gasket mounting station, then continues to suck the gasket from the discharging strip and places the gasket on a second gasket mounting station, and then continues to suck the gasket from the discharging strip and places the gasket on a first gasket mounting station;

step three: the large-scale manipulator moves from the first stop position to the second stop position, eight proximity switches on the sucker device are over against eight gasket installation stations on the discharging plate, and the distances between the eight proximity switches and the gaskets are smaller than 20mm so as to detect whether the gaskets on the eight gasket installation stations are installed in place or not;

step four: the large manipulator moves from the second stop position to a third stop position, and the sucking disc device sucks the gasket on the discharge plate;

step five: the large manipulator moves from the third stop position to the fourth stop position, and then a gasket on the sucker device is placed on the fixed die;

step six: the large manipulator moves from the fourth stopping position to the fifth stopping position, eight proximity switches on the sucker device are over against eight mounting columns for mounting the gaskets on the fixed die, and the distance between the eight proximity switches and the gaskets is less than 20mm so as to detect whether the gaskets on the eight mounting columns are mounted in place;

step seven: the large manipulator moves to a sixth stop position, and the sucking disc device sucks the two chair armrests which are formed by injection molding on the movable die;

step eight: the large manipulator moves to a seventh stopping position to place the two chair armrests into the finished product bin, and then the large manipulator returns to the first stopping position; meanwhile, the first driving mechanism pushes the movable mold to move so as to complete the mold closing process with the fixed mold, and the pouring system completes the injection molding process;

step nine: and repeating the second to the eighth steps to further finish the injection molding of the next two chair armrests.

Preferably, the chair armrest comprises a first supporting plate, a second supporting plate, a third supporting plate and an armrest plate which are integrally formed and are surrounded into a circle, the first supporting plate and the third supporting plate are respectively positioned on the left side and the right side, the armrest plate and the second supporting plate are respectively positioned on the upper side and the lower side, the end faces of the first supporting plate, the second supporting plate and the third supporting plate are respectively positioned on the front side and the rear side, the end face of the armrest plate is positioned on the upper side and the lower side, the armrest plate is an arc-shaped plate, the middle part of the armrest plate is arched upwards, the shape of the first supporting plate is matched with the lower half part of a chair backrest frame, the shape of the second supporting plate is matched with the chair seat frame, a first gasket pre-embedding hole and a second gasket pre-embedding hole are formed in the first supporting plate, and a third gasket pre-embedding hole and a fourth gasket pre-embedding hole are formed in the second supporting plate;

the material discharging plate comprises a discharging plate, a first gasket installation station, a second gasket installation station, a third gasket installation station, a fourth gasket installation station, a vibration disc and a miniature manipulator, wherein the first gasket installation station corresponds to a first gasket pre-buried hole, the second gasket installation station corresponds to a second gasket pre-buried hole, the third gasket installation station corresponds to a third gasket pre-buried hole, the fourth gasket installation station corresponds to a fourth gasket pre-buried hole, the vibration disc conveys gaskets to the discharging plate through vibration, and the miniature manipulator conveys the gaskets on the discharging plate to the first gasket installation station, the second gasket installation station, the third gasket installation station and the fourth gasket installation station on the discharging plate respectively.

Preferably, the miniature mechanical arm comprises a first support, a second support, a left-right moving assembly, a front-back moving assembly, a vertical moving assembly and two first gasket suckers, the first support and the second support are both of a door-shaped structure formed by two upright columns and a cross beam, the first support and the second support are distributed on the front half section and the rear half section of the first workbench, the vibrating disc is located behind the second support, the discharging strip penetrates through the second support and extends between the first support and the second support, and the discharging plate is located between the first support and the second support;

the back-and-forth movement assembly comprises a first sliding seat, the first sliding seat is slidably mounted on the first support and the second support through the back-and-forth movement assembly, the up-and-down movement assembly is mounted on the back-and-forth movement assembly, the two first gasket suckers are fixedly mounted on the up-and-down movement assembly, the two first gasket suckers respectively suck two sides of a circular hole in a gasket on the discharging strip, and then the gasket is sucked and placed on the discharging plate.

Preferably, the left-right moving assembly comprises a first motor, a first lead screw, a first sliding block, a first sliding rail, a second sliding block and a second sliding rail, the first sliding rail and the first motor are fixedly mounted on a first support, the second sliding rail is fixedly mounted on a second support, the first sliding block is in sliding fit with the first sliding rail, the second sliding block is in sliding fit with the second sliding rail, two ends of the first sliding seat are fixedly connected with the first sliding block and the second sliding block respectively, the first sliding block is sleeved on the first lead screw, and the first motor drives the first lead screw to rotate so as to drive the first sliding block to slide on the first sliding rail and further drive the first sliding seat to move left and right;

the back-and-forth movement assembly comprises a second motor, a second lead screw, a third sliding block and a third sliding rail, the third sliding rail and the second motor are fixedly mounted on the first sliding seat, the third sliding block is in sliding fit with the third sliding rail, the third sliding block is sleeved on the second lead screw, the up-and-down movement assembly is fixedly mounted on the third sliding block, and the second motor drives the second lead screw to rotate so as to drive the third sliding block to slide on the third sliding rail and further drive the up-and-down movement assembly to move back and forth;

the up-down moving assembly comprises a second sliding seat, a third motor, a third screw rod, a fourth slider and a fourth sliding rail, the fourth sliding rail and the third motor are fixedly mounted on the second sliding seat, the fourth slider and the fourth sliding rail are in sliding fit, the fourth slider is sleeved on the third screw rod, the first gasket sucker is fixedly mounted on the fourth slider, and the third motor drives the third screw rod to rotate so as to drive the fourth slider to slide on the fourth sliding rail and further drive the first gasket sucker to move up and down.

Preferably, the discharging strip comprises a vibrating electromagnet, a vibrating support and a conveying guide rail, the conveying guide rail is fixedly installed on the vibrating support and located above the vibrating support, the conveying guide rail comprises an input end and an output end, the input end is connected with the vibrating disc, the output end is lower than the input end, and the first gasket sucker sucks up the gasket from the output end;

the vibration electromagnet is fixedly installed on the vibration support, and transmits vibration to the conveying guide rail through the vibration support, so that the gasket on the conveying guide rail moves from the input end to the output end.

Further preferably, the output end is also provided with a limiting bulge, and the limiting bulge is used for preventing the gasket from falling off from the conveying guide rail.

Preferably, the conveying guide rail comprises a top wall, a bottom wall, a left wall and a right wall, a gap with the same length as the top wall is arranged in the middle of the top wall, the direction of the gap is consistent with the conveying direction of the gaskets, the distance between the top wall and the bottom wall is larger than the thickness of one gasket and smaller than the thickness of 1.2 gaskets, the distance between the left wall and the right wall is larger than the diameter of one gasket and smaller than the diameter of 1.05 gaskets, and the length of the top wall is at least smaller than the length of one gasket diameter of the bottom wall.

Preferably, the vibration support comprises an upper mounting plate, a lower mounting plate, a left oblique connecting plate and a right oblique connecting plate, the upper mounting plate, the right oblique connecting plate, the lower mounting plate and the left oblique connecting plate are sequentially connected end to form a parallelogram structure in an enclosing manner, and the parallelogram structure is obliquely arranged towards the output end of the conveying guide rail; the lower mounting plate is arranged above the mounting seat, and the conveying guide rail is arranged above the upper mounting plate;

the vibrating electromagnet is fixedly arranged on the positioning plate, and the left side and the right side of the positioning plate are respectively connected to the left oblique connecting plate and the right oblique connecting plate.

Preferably, the first gasket mounting station, the second gasket mounting station, the third gasket mounting station and the fourth gasket mounting station comprise mounting round tables and positioning columns, the positioning columns are conical positioning columns, and the round tables and the positioning columns are coaxially distributed.

Preferably, the left-right moving mechanism comprises a fourth motor, a fourth screw rod, a fifth slider and a fifth slide rail, the fifth slide rail and the fourth motor are fixedly mounted on the first cross beam, the fifth slider is in sliding fit with the fifth slide rail, the fifth slider is sleeved on the fourth screw rod, the second cross beam is fixedly connected with the fifth slider, and the fourth motor drives the fourth screw rod to rotate so as to drive the fifth slider to slide on the fifth slide rail and further drive the second cross beam to move left and right;

the front-back moving mechanism comprises a fifth motor, a fifth screw rod, a sixth sliding block and a sixth sliding rail, the sixth sliding rail and the fifth motor are fixedly mounted on the second cross beam, the sixth sliding block is in sliding fit with the sixth sliding rail, the sixth sliding block is sleeved on the fifth screw rod, the first mounting seat is fixedly connected with the sixth sliding block, and the fifth motor drives the fifth screw rod to rotate so as to drive the sixth sliding block to slide on the sixth sliding rail and further drive the first mounting seat to move front and back;

the up-down moving mechanism comprises a sixth motor, a sixth lead screw, a seventh sliding block and a seventh sliding rail, the seventh sliding rail and the sixth motor are fixedly installed on the first installation seat, the seventh sliding block is in sliding fit with the seventh sliding rail, the seventh sliding block is sleeved on the sixth lead screw, the first vertical beam is fixedly connected with the seventh sliding block, and the sixth motor drives the sixth lead screw to rotate so as to drive the seventh sliding block to slide on the seventh sliding rail and further drive the first vertical beam to move up and down.

Preferably, the sucker device comprises a first mounting plate and a second mounting plate, the first mounting plate comprises an A side and a B side which are oppositely arranged, the A side of the first mounting plate is rotatably mounted at the bottom of the first vertical beam through a first air cylinder, the second mounting plate is rotatably mounted at the B side of the first mounting plate through a second air cylinder, a plurality of groups of second gasket suckers which are distributed pairwise are arranged on the end surface, back to the second mounting plate, of the first mounting plate, and a plurality of handrail suckers are arranged on the end surface, back to the first mounting plate, of the second mounting plate;

when the large manipulator is located at the first stop position, the second gasket sucker faces the rear direction, and the armrest sucker faces the front direction;

when the large-scale manipulator is located at a second stop position and a third stop position, the second gasket sucker faces downwards, and the handrail sucker faces upwards;

when the large manipulator is located at a fourth stop position and a fifth stop position, the second gasket sucker faces the rear direction, and the handrail sucker faces the front direction;

when the large manipulator is located at a sixth stopping position, the second gasket sucker faces the rear direction, and the handrail sucker faces the front direction;

when the large-scale manipulator is located at the seventh stop position, the second gasket sucker faces backwards, and the handrail sucker faces downwards.

Preferably, each proximity switch and each group of second gasket suckers distributed pairwise are arranged in an isosceles triangle.

An injection molding system of a chair armrest adopts the injection molding method of the chair armrest.

The invention has the beneficial effects that:

1) According to the invention, the gasket is placed on each station of the discharge plate by adopting the small-sized manipulator, and then the gasket is placed on the fixed die by using the large-sized manipulator, so that the gasket placing accuracy can be effectively ensured, and meanwhile, the gasket can be controlled to be consistent with the die assembly and injection molding time of the movable die and the fixed die by adjusting the speed of the small-sized manipulator and the speed of the large-sized manipulator, so that the production efficiency of the chair armrest is improved.

2) The injection molding of the two chair armrests can be completed at one time, and the production efficiency of the chair armrests is improved.

Drawings

FIG. 1 is a schematic view of an injection molding system for chair arm rests according to the present invention;

FIG. 2 is a schematic view of a large robot of the present invention;

FIG. 3 is a schematic view of a gasket vibratory feed of the present invention;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

FIG. 5 is a schematic view of a take-off plate of the present invention;

FIG. 6 is an enlarged schematic view at B of FIG. 5;

fig. 7 is a schematic view of the armrest of the chair according to the present invention.

Description of reference numerals: 1. an injection molding machine; 5. a small-sized manipulator; 20. a first support plate; 21. a second support plate; 22. a third support plate; 23. a handrail plate; 24. a first gasket pre-buried hole; 25. a second gasket pre-buried hole; 26. a third pad pre-burying hole; 27. a fourth gasket pre-buried hole; 30. a first table; 31. a vibrating pan; 32. discharging the material strips; 33. a discharge plate; 330. a first gasket mounting station; 331. a second gasket mounting station; 332. a third gasket installation station; 333. a fourth gasket installation station; 40. a first cross member; 41. a second cross member; 42. a first vertical beam; 43. a suction cup device; 50. a first bracket; 51. a second bracket; 52. a first sliding seat; 53. a first slider; 54. a first slide rail; 55. a second slider; 56. a second slide rail; 57. a third slider; 58. a third slide rail; 59. a fourth slider; 320. a vibration bracket; 321. a conveying guide rail; 3210. a limiting bulge; 3211. a top wall; 3212. a bottom wall; 3213. a left portion wall; 3214. a right portion wall; 430. a first mounting plate; 431. a second mounting plate; 432. a second gasket suction cup; 433. a handrail sucker; 334. a circular truncated cone is installed; 335. and a positioning column.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

the injection molding system of the chair armrest as shown in fig. 1 comprises a gasket vibration feeding device, an injection molding machine 1 and a large-scale manipulator, wherein the injection molding machine 1 is a common device on the market, and is not detailed here, generally, the injection molding machine 1 comprises a first driving mechanism, a pouring system, a movable mold and a fixed mold as shown in the figure, the movable mold and the fixed mold are fixedly installed in the injection molding machine 1, the large-scale manipulator grabs the gasket from the gasket vibration feeding device and puts the gasket on the fixed mold, the first driving mechanism pushes the movable mold to move so as to complete a mold closing process with the fixed mold, and the pouring system completes an injection molding process.

In this embodiment, the chair armrest is as shown in fig. 7, and includes a first support plate 20, a second support plate 21, a third support plate 22, and an armrest plate 23 that are integrally formed and enclose into a circle, where the first support plate 20 and the third support plate 22 are respectively located on the left and right sides, the armrest plate 23 and the second support plate 21 are respectively located on the upper and lower sides, end surfaces of the first support plate 20, the second support plate 21, and the third support plate 22 are located on the front and rear sides, an end surface of the armrest plate 23 is located on the upper and lower sides, the armrest plate 23 is an arc-shaped plate, a middle portion of the armrest plate 23 is arched upward, a shape of the first support plate 20 is matched with a lower half portion of a chair backrest frame, a shape of the second support plate 21 is matched with a chair seat frame, the first support plate 20 is provided with a first gasket pre-buried hole 24 and a second gasket pre-buried hole 25, and the second support plate 21 is provided with a third gasket pre-buried hole 26 and a fourth gasket pre-buried hole 27;

it should be noted that the end surfaces of the first support plate 20, the second support plate 21, the third support plate 22 and the armrest plate 23 refer to two surfaces having the largest area;

in this embodiment, as shown in fig. 3, the gasket vibration feeding device includes a first workbench 30, a vibration feeding device mounted on the first workbench 30, a mini-manipulator 5, and a discharging plate 33 as shown in fig. 5, the vibration feeding device includes a vibration disc 31 mounted on the workbench and a discharging strip 32 mounted on the vibration disc 31, two first gasket mounting stations 330, two second gasket mounting stations 331, two third gasket mounting stations 332, and two fourth gasket mounting stations 333 are symmetrically arranged on the discharging plate 33, wherein the first gasket mounting stations 330 correspond to the first gasket pre-burying holes 24, the second gasket mounting stations 331 correspond to the second gasket pre-burying holes 25, the third gasket mounting stations 332 correspond to the third gasket pre-burying holes 26, the fourth gasket mounting stations 333 correspond to the fourth gasket pre-burying holes 27, the vibration disc 31 sends gaskets to the discharging strip 32 by vibration, and the mini-manipulator 5 sends the gaskets on the discharging strip 32 to the first gasket mounting stations 330, the second gasket mounting stations 331, the fourth gasket mounting stations 333, and the fourth gasket mounting stations 333 on the discharging plate 33, respectively;

as shown in fig. 2, the large manipulator further includes a first beam 40, a second beam 41, a first mounting seat, a first vertical beam 42 and a suction cup device 43, two ends of the first beam 40 respectively face to the left and right directions and are fixedly mounted on the top end of the injection molding machine 1, the second beam 41 is mounted on the first beam 40 through a left-right moving mechanism, two ends of the second beam 41 respectively face to the front and back directions, the first mounting seat is mounted on the second beam 41 through a front-back moving mechanism, the first vertical beam 42 is mounted on the first mounting seat through an up-down moving mechanism, the suction cup device 43 is rotatably mounted at the bottom of the first vertical beam 42, the suction cup device 43 is used for sucking the gasket on the discharging plate 33 and placing the gasket on the fixed mold and sucking the injection molded chair armrest on the movable mold and placing the gasket on the finished product bin,

the large manipulator is sequentially provided with a first stopping position, a second stopping position, a third stopping position, a fourth stopping position and a fifth stopping position; after the small-sized mechanical arm 5 respectively sends the gasket to the first gasket installation station 330, the second gasket installation station 331, the third gasket installation station 332 and the fourth gasket installation station 333 on the discharge plate 33, the large-sized mechanical arm moves from the first stop position to the second stop position, the suction disc device 43 sucks the gasket on the discharge plate 33, then the large-sized mechanical arm moves to the third stop position to place the gasket on the suction disc device 43 on the fixed mold, then the large-sized mechanical arm moves to the fourth stop position again, the suction disc device 43 sucks two injection-molded chair handrails on the movable mold, then the large-sized mechanical arm moves to the fifth stop position again to place the two chair handrails in the finished product bin, and then the large-sized mechanical arm returns to the first stop position again.

Like this, adopt small-size manipulator 5 to put the gasket to each station of row flitch 33 on, then reuse large-scale manipulator places the gasket on the cover half, can effectively ensure the precision that the gasket was put, simultaneously through the speed of adjusting small-size manipulator 5 and large-scale manipulator, can be unanimous with movable mould cover half compound die injection time with its control, and then improved the production efficiency of chair handrail.

In addition, the injection molding system can complete injection molding of the two chair armrests at one time, and production efficiency of the chair armrests is improved.

In this embodiment, the mini-manipulator 5 includes a first support 50, a second support 51, a left-right moving assembly, a front-back moving assembly, a vertical moving assembly and two first gasket suckers, where the first support 50 and the second support 51 are both gate-shaped structures composed of two vertical columns and a cross beam, the first support 50 and the second support 51 are distributed in front and back half sections of the first workbench 30, the vibrating plate 31 is located behind the second support 51, the discharging strip 32 passes through the second support 51 and extends between the first support 50 and the second support 51, and the discharging plate 33 is located between the first support 50 and the second support 51;

the back-and-forth movement assembly comprises a first sliding seat 52, the first sliding seat 52 is slidably mounted on the first support 50 and the second support 51 through the back-and-forth movement assembly, the up-and-down movement assembly is mounted on the back-and-forth movement assembly, the two first gasket suction cups are fixedly mounted on the up-and-down movement assembly, the two first gasket suction cups respectively suck two sides of the upper circular holes of the gaskets on the discharging strip 32, and then the gaskets are sucked and placed on the discharging plate 33.

So set up, through the reasonable arrangement to first support 50, row flitch 33 and vibration dish 31, can effectively reduce the small-size manipulator 5 and arrange the stroke that the gasket will be passed on full on row flitch 33.

In this embodiment, the left-right moving assembly includes a first motor, a first lead screw, a first slider 53, a first slide rail 54, a second slider 55 and a second slide rail 56, the first slide rail 54 and the first motor are fixedly mounted on the first bracket 50, the second slide rail 56 is fixedly mounted on the second bracket 51, the first slider 53 is in sliding fit with the first slide rail 54, the second slider 55 is in sliding fit with the second slide rail 56, two ends of the first sliding seat 52 are respectively fixedly connected with the first slider 53 and the second slider 55, the first slider 53 is mounted on the first lead screw in a sleeved manner, and the first motor drives the first lead screw to rotate so as to drive the first slider 53 to slide on the first slide rail 54 and further drive the first sliding seat 52 to move left and right;

the back-and-forth movement assembly comprises a second motor, a second screw rod, a third slide block 57 and a third slide rail 58, the third slide rail 58 and the second motor are fixedly arranged on the first sliding seat 52, the third slide block 57 is in sliding fit with the third slide rail 58, the third slide block 57 is sleeved on the second screw rod, the up-and-down movement assembly is fixedly arranged on the third slide block 57, and the second motor drives the second screw rod to rotate so as to drive the third slide block 57 to slide on the third slide rail 58 and further drive the up-and-down movement assembly to move back and forth;

the up-down moving assembly comprises a second sliding seat, a third motor, a third screw rod, a fourth sliding block 59 and a fourth sliding rail, the fourth sliding rail and the third motor are fixedly installed on the second sliding seat, the fourth sliding block 59 is in sliding fit with the fourth sliding rail, the fourth sliding block 59 is sleeved with the third sliding block, the first gasket sucker is fixedly installed on the fourth sliding block 59, and the third motor drives the third screw rod to rotate so as to drive the fourth sliding block 59 to slide on the fourth sliding rail, so that the first gasket sucker is driven to move up and down.

In this embodiment, the discharging strip 32 includes a vibrating electromagnet, a vibrating bracket 320 and a conveying guide rail 321, the conveying guide rail 321 is fixedly installed on the vibrating bracket 320 and located above the vibrating bracket 320, the conveying guide rail 321 includes an input end and an output end, the input end is connected with the vibrating disk 31, the output end is lower than the input end, and the first gasket suction cup sucks up the gasket from the output end;

the vibrating electromagnet is fixedly mounted on the vibrating bracket 320, and transmits vibration to the conveying guide rail 321 through the vibrating bracket 320, so that the gasket on the conveying guide rail 321 moves from the input end to the output end.

Further preferably, the output end is further provided with a limiting protrusion 3210, and the limiting protrusion 3210 is used to prevent the gasket from falling off the conveying guide rail 321.

In this embodiment, as shown in fig. 4, the conveying rail 321 includes a top wall 3211, a bottom wall 3212, a left wall 3213, and a right wall 3214, a middle portion of the top wall 3211 is provided with a gap equal to the length of the top wall 3211, the gap is oriented in a conveying direction of the gasket, a distance between the top wall 3211 and the bottom wall 3212 is greater than a thickness of one gasket and less than a thickness of 1.2 gaskets, a distance between the left wall 3213 and the right wall 3214 is greater than a diameter of one gasket and less than a diameter of 1.05 gaskets, and the length of the top wall 3211 is at least less than a diameter of one gasket of the bottom wall 3212. With such an arrangement, the gasket can be moved along the conveying guide rail 321 very neatly; meanwhile, the gap is formed between the top walls 3211, so that the conveying condition of the gasket in the conveying guide rail 321 can be conveniently observed, the gasket can be prevented from vibrating to fall out of the conveying guide rail 321, and the length of the top walls 3211, which is at least smaller than that of the bottom walls 3212, of one gasket diameter is convenient for the first gasket sucker to suck the gasket from the output end of the conveying guide rail 321.

In this embodiment, the vibration support 320 includes an upper mounting plate, a lower mounting plate, a left oblique connecting plate, and a right oblique connecting plate, which are sequentially connected end to form a parallelogram structure, and the parallelogram structure is inclined toward the output end of the conveying rail 321; the lower mounting plate is mounted above the mounting seat, and the conveying guide rail 321 is mounted above the upper mounting plate;

In this embodiment, as shown in fig. 6, each of the first gasket mounting station 330, the second gasket mounting station 331, the third gasket mounting station 332, and the fourth gasket mounting station 333 includes a mounting circular truncated cone 334 and a positioning pillar 335, the positioning pillar 335 is a conical positioning pillar 335, and the circular truncated cone and the positioning pillar 335 are coaxially distributed; this is done to facilitate placement of the spacers, and the tapered locating posts 335 are designed to allow some tolerance in the movement of the compact robot 5.

In this embodiment, the left-right moving mechanism includes a fourth motor, a fourth screw rod, a fifth slider and a fifth slide rail, the fifth slide rail and the fourth motor are fixedly mounted on the first cross beam 40, the fifth slider is in sliding fit with the fifth slide rail, the fifth slider is sleeved on the fourth screw rod, the second cross beam 41 is fixedly connected with the fifth slider, and the fourth motor drives the fourth screw rod to rotate so as to drive the fifth slider to slide on the fifth slide rail, and further drive the second cross beam 41 to move left and right;

the front-back moving mechanism comprises a fifth motor, a fifth screw rod, a sixth slider and a sixth slide rail, the sixth slide rail and the fifth motor are fixedly mounted on the second cross beam 41, the sixth slider is in sliding fit with the sixth slide rail, the sixth slider is sleeved on the fifth screw rod, the first mounting seat is fixedly connected with the sixth slider, and the fifth motor drives the fifth screw rod to rotate so as to drive the sixth slider to slide on the sixth slide rail and further drive the first mounting seat to move front and back;

the up-down moving mechanism comprises a sixth motor, a sixth lead screw, a seventh sliding block and a seventh sliding rail, the seventh sliding rail and the sixth motor are fixedly installed on the first installation seat, the seventh sliding block is in sliding fit with the seventh sliding rail, the seventh sliding block is sleeved on the sixth lead screw, the first vertical beam 42 is fixedly connected with the seventh sliding block, and the sixth motor drives the sixth lead screw to rotate so as to drive the seventh sliding block to slide on the seventh sliding rail and further drive the first vertical beam 42 to move up and down.

In this embodiment, the suction cup device 43 includes a first mounting plate 430 and a second mounting plate 431, the first mounting plate 430 includes an a side and a B side which are oppositely disposed, the a side of the first mounting plate 430 is rotatably mounted at the bottom of the first vertical beam 42 through a first cylinder, the second mounting plate 431 is rotatably mounted at the B side of the first mounting plate 430 through a second cylinder, a plurality of groups of second pad suction cups 432 which are distributed pairwise are disposed on an end surface of the first mounting plate 430, which is opposite to the second mounting plate 431, and a plurality of handrail suction cups 433 are disposed on an end surface of the second mounting plate 431, which is opposite to the first mounting plate 430;

when the large manipulator is in the first stop position, the second gasket sucker 432 faces backwards, and the handrail sucker 433 faces forwards;

when the large manipulator is in the second stop position, the second gasket sucker 432 faces downwards, and the handrail sucker 433 faces upwards;

when the large manipulator is in the third stop position, the second pad sucker 432 faces backwards, and the handrail sucker 433 faces forwards;

when the large manipulator is at the fourth stop position, the second pad sucker 432 faces backwards, and the handrail sucker 433 faces forwards;

when the large manipulator is in the fifth resting position, the second pad suction cup 432 faces rearward and the handrail suction cup 433 faces downward.

Further preferably, the second pad suction cup 432 and the handrail suction cup 433 are both straight vacuum suction cups.

In this embodiment, the fixed mold is provided with a plurality of mounting columns, and the large manipulator sleeves a plurality of gaskets captured by the sucker device 43 on the plurality of mounting columns.

The injection molding method of the chair armrest adopts the injection molding system of the chair armrest, and comprises the following specific steps:

the method comprises the following steps: starting the vibrating disk 31, and conveying the gasket to the discharging strip 32 by the vibrating disk 31 through vibration;

step two: the mini-robot 5 picks up shims from the take-off bar 32 and places them at the first shim mounting station 330, then continues to pick up shims from the take-off bar 32 and places them at the second shim mounting station 331, then continues to pick up shims from the take-off bar 32 and places them at the third shim mounting station 332, then continues to pick up shims from the take-off bar 32 and places them at the fourth shim mounting station 333, then continues to pick up shims from the take-off bar 32 and places them at the third shim mounting station 332, then continues to pick up shims from the take-off bar 32 and places them at the second shim mounting station 331, then continues to pick up shims from the take-off bar 32 and places them at the first shim mounting station 330;

step three: the large-scale mechanical arm moves from the first stop position to the second stop position, and the suction disc device 43 sucks the gasket on the discharge plate 33;

step four: the large manipulator moves to a third stop position, and then the gasket on the sucking disc device 43 is placed on the fixed die;

step five: the large manipulator moves to a fourth stopping position, and the sucking disc device 43 sucks the two injection-molded chair armrests on the movable mold;

step six: the large manipulator moves to a fifth stopping position, the two chair armrests are placed in the finished product bin, and then the large manipulator returns to the first stopping position; meanwhile, the first driving mechanism pushes the movable mold to move so as to complete the mold closing process with the fixed mold, and the pouring system completes the injection molding process;

step seven: and repeating the second step to the sixth step to further finish the injection molding of the next two chair armrests.

It is worth to be noted that, in the injection molding process of the two chair armrests, the step two and the steps three to six are performed synchronously; and then reduced the shaping time of single chair handrail, improved the efficiency of moulding plastics of chair handrail.

Example two:

the difference between the present embodiment and the first embodiment is: eight proximity switches for detecting whether the gasket is installed in place are further arranged on the sucker device.

The gasket forming method in the embodiment specifically comprises the following steps:

the method comprises the following steps: starting the vibrating disk (31), and conveying the gasket to the discharging strip (32) by the vibrating disk (31) through vibration;

step two: the mini-robot (5) sucks the gasket from the discharging strip (32) and places it at the first gasket mounting station (330), then continues to suck the gasket from the discharging strip (32) and places it at the second gasket mounting station (331), then continues to suck the gasket from the discharging strip (32) and places it at the third gasket mounting station (332), then continues to suck the gasket from the discharging strip (32) and places it at the fourth gasket mounting station (333), then continues to suck the gasket from the discharging strip (32) and places it at the third gasket mounting station (332), then continues to suck the gasket from the discharging strip (32) and places it at the second gasket mounting station (331), and then continues to suck the gasket from the discharging strip (32) and places it at the first gasket mounting station (330);

step three: the large-scale manipulator moves from the first stop position to the second stop position, eight proximity switches on the sucker device are over against eight gasket mounting stations on the discharging plate, and the distance between the eight proximity switches and the gaskets is smaller than 20mm so as to detect whether the gaskets on the eight gasket mounting stations are mounted in place;

step four: the large manipulator moves from the second stop position to a third stop position, and the gasket on the discharging plate (33) is sucked by the sucking disc device (43);

step five: the large manipulator moves from the third stop position to the fourth stop position, and then a gasket on the sucking disc device (43) is placed on the fixed die;

step six: the large manipulator moves from the fourth stop position to the fifth stop position, eight proximity switches on the sucker device (43) are over against eight mounting columns for mounting the gaskets on the fixed die, and the distances between the eight proximity switches and the gaskets are smaller than 20mm so as to detect whether the gaskets on the eight mounting columns are mounted in place;

step seven: the large manipulator moves to a sixth stop position, and the sucking disc device (43) sucks the two chair armrests which are formed by injection molding on the movable die;

Further preferably, when the large manipulator is in the first stop position, the second pad suction cup (432) faces rearward and the armrest suction cup (433) faces forward;

when the large manipulator is located at a second stop position and a third stop position, the second gasket sucker (432) faces downwards, and the handrail sucker (433) faces upwards;

when the large manipulator is located at a fourth stop position and a fifth stop position, the second gasket sucker (432) faces towards the rear, and the handrail sucker (433) faces towards the front;

when the large manipulator is located at a sixth stop position, the second gasket sucker (432) faces to the rear direction, and the handrail sucker (433) faces to the front direction;

when the large manipulator is at a seventh stop position, the second gasket sucker (432) faces backwards, and the handrail sucker (433) faces downwards.

Preferably, the eight proximity switches are all installed on the first installation plate (430), and each proximity switch and each group of second gasket suckers (432) distributed pairwise are arranged in an isosceles triangle shape; therefore, when the large manipulator moves from the second stop position to the third stop position and moves from the fourth stop position to the fifth stop position, the large manipulator only needs to move for a certain distance in the linear direction.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding method of chair armrests comprises a gasket vibration feeding device, an injection molding machine (1) and a large manipulator, wherein the injection molding machine (1) comprises a first driving mechanism, a pouring system, a movable mold and a fixed mold, the movable mold and the fixed mold are fixedly installed in the injection molding machine (1), the large manipulator grabs the gasket from the gasket vibration feeding device and places the gasket on the fixed mold, the first driving mechanism pushes the movable mold to move so as to complete a mold closing process with the fixed mold, and the pouring system completes an injection molding process; the method is characterized in that:

the gasket vibration feeding device comprises a first workbench (30), a vibration feeding device, a small-sized mechanical arm (5) and a discharging plate (33), wherein the vibration feeding device, the small-sized mechanical arm and the discharging plate (33) are installed on the first workbench (30), the vibration feeding device comprises a vibration disc (31) installed on the first workbench (30) and a discharging strip (32) installed on the vibration disc (31), and the discharging plate (33) is provided with two first gasket installation stations (330), two second gasket installation stations (331), two third gasket installation stations (332) and two fourth gasket installation stations (333) which are symmetrically distributed;

the small manipulator (5) comprises a first gasket sucker, and the small manipulator can drive the first gasket sucker to move in the left-right direction and the front-back direction, so that gaskets on the discharging strip (32) are placed on a first gasket mounting station (330), a second gasket mounting station (331), a third gasket mounting station (332) and two fourth gasket mounting stations (333) on the discharging plate (33) one by one;

the large manipulator further comprises a first cross beam (40), a second cross beam (41), a first mounting seat, a first vertical beam (42) and a sucker device (43), wherein two ends of the first cross beam (40) face to the left and right directions respectively and are fixedly mounted at the top end of the injection molding machine (1), the second cross beam (41) is mounted on the first cross beam (40) through a left-right moving mechanism, two ends of the second cross beam (41) face to the front and back directions respectively, the first mounting seat is mounted on the second cross beam (41) through a front-back moving mechanism, the first vertical beam (42) is mounted on the first mounting seat through an up-down moving mechanism, the sucker device (43) is rotatably mounted at the bottom of the first vertical beam (42), and the sucker device (43) is used for discharging gaskets on the material discharging plate (33) and placing the gaskets on the fixed mold and sucking injection-molded chair handrails on the movable mold and placing the gaskets in a finished product bin;

the sucker device (43) comprises a first mounting plate (430) and a second mounting plate (431), the first mounting plate (430) comprises an A side and a B side which are arranged oppositely, the A side of the first mounting plate (430) is rotatably mounted at the bottom of a first vertical beam (42) through a first air cylinder, the second mounting plate (431) is rotatably mounted at the B side of the first mounting plate (430) through a second air cylinder, eight groups of second gasket suckers (432) which are distributed pairwise are arranged on the end surface, opposite to the second mounting plate (431), of the first mounting plate (430), and a plurality of handrail suckers (433) are arranged on the end surface, opposite to the first mounting plate (430), of the second mounting plate (431);

the method comprises the following specific steps:

step three: the large-scale manipulator moves from the first stop position to the second stop position, eight proximity switches on the sucker device are over against eight gasket mounting stations on the discharging plate, and the distance between the eight proximity switches and the gaskets is smaller than 20mm so as to detect whether the gaskets on the eight gasket mounting stations are mounted in place; when the large manipulator is at a first stop position, the second gasket sucker (432) faces towards the rear, and the handrail sucker (433) faces towards the front;

step four: the large manipulator moves from the second stop position to a third stop position, and the sucking disc device (43) sucks the gasket on the discharge plate (33); when the large manipulator is at a second stop position, the second gasket sucker (432) faces downwards, and the handrail sucker (433) faces upwards;

step five: the large manipulator moves from the third stop position to the fourth stop position, and then a gasket on the sucking disc device (43) is placed on the fixed die; when the large manipulator is at a third stop position, the second gasket sucker (432) faces downwards, and the handrail sucker (433) faces upwards; when the large manipulator is at a fourth stopping position, the second gasket sucker (432) faces to the rear, and the handrail sucker (433) faces to the front;

step six: the large manipulator moves from the fourth stop position to the fifth stop position, eight proximity switches on the sucker device (43) are over against eight mounting columns for mounting the gaskets on the fixed die, and the distances between the eight proximity switches and the gaskets are smaller than 20mm so as to detect whether the gaskets on the eight mounting columns are mounted in place; when the large manipulator is at a fifth stopping position, the second gasket sucker (432) faces to the rear, and the handrail sucker (433) faces to the front;

step seven: the large manipulator moves to a sixth stopping position, and the sucking disc device (43) sucks the two chair armrests which are formed by injection molding on the movable die; when the large manipulator is at a sixth stop position, the second gasket sucker (432) faces towards the rear, and the handrail sucker (433) faces towards the front;

step eight: the large manipulator moves to a seventh stopping position to place the two chair armrests into the finished product bin, and then returns to the first stopping position; meanwhile, the first driving mechanism pushes the movable mold to move so as to complete the mold closing process with the fixed mold, and the pouring system completes the injection molding process; when the large manipulator is at a seventh stop position, the second gasket sucker (432) faces backwards, and the handrail sucker (433) faces downwards;

step nine: and repeating the second step to the eighth step to further complete the injection molding of the next two chair armrests.

2. The injection molding method of a chair armrest according to claim 1, wherein the chair armrest comprises a first support plate (20), a second support plate (21), a third support plate (22) and an armrest plate (23) which are integrally molded and enclosed into a ring, the first support plate (20) and the third support plate (22) are respectively located on the left side and the right side, the armrest plate (23) and the second support plate (21) are respectively located on the upper side and the lower side, the end surfaces of the first support plate (20), the second support plate (21) and the third support plate (22) are respectively located on the front side and the rear side, the end surface of the armrest plate (23) is located on the upper side and the lower side, the armrest plate (23) is an arc-shaped plate, the middle portion of the armrest plate (23) is arched upwards, the first support plate (20) is shaped to match the lower half portion of a chair backrest frame, the second support plate (21) is shaped to match a chair seat frame, the first support plate (20) is provided with a first gasket pre-embedding hole (24) and a second gasket pre-embedding hole (25), and the second support plate (21) is provided with a fourth gasket pre-embedding hole (27);

the gasket material discharging device is characterized in that a first gasket mounting station (330) corresponds to a first gasket pre-buried hole (24), a second gasket mounting station (331) corresponds to a second gasket pre-buried hole (25), a third gasket mounting station (332) corresponds to a third gasket pre-buried hole (26), a fourth gasket mounting station (333) corresponds to a fourth gasket pre-buried hole (27), the vibrating disc (31) sends gaskets to the discharging strip (32) through vibration, and the small mechanical arm (5) sends the gaskets on the discharging strip (32) to the first gasket mounting station (330), the second gasket mounting station (331), the third gasket mounting station (332) and the fourth gasket mounting station (333) on the discharging plate (33) respectively.

3. The injection molding method of the chair armrest is characterized in that the miniature mechanical arm (5) comprises a first support (50), a second support (51), a left-right moving assembly, a front-back moving assembly, an up-down moving assembly and two first gasket suckers, the first support (50) and the second support (51) are both of a door-shaped structure consisting of two upright posts and a cross beam, the first support (50) and the second support (51) are distributed at the front half section and the rear half section of the first workbench (30), the vibrating disc (31) is positioned behind the second support (51), the discharging strip (32) passes through the second support (51) and extends between the first support (50) and the second support (51), and the discharging plate (33) is positioned between the first support (50) and the second support (51);

the back-and-forth moving assembly comprises a first sliding seat (52), the first sliding seat (52) is slidably mounted on a first support (50) and a second support (51) through the back-and-forth moving assembly, the up-and-down moving assembly is mounted on the back-and-forth moving assembly, the two first gasket suckers are fixedly mounted on the up-and-down moving assembly, the two first gasket suckers respectively suck two sides of a circular hole in a gasket on the discharging strip (32), and then the gasket is sucked and placed on the discharging plate (33);

the left-right moving assembly comprises a first motor, a first screw rod, a first sliding block (53), a first sliding rail (54), a second sliding block (55) and a second sliding rail (56), the first sliding rail (54) and the first motor are fixedly mounted on a first support (50), the second sliding rail (56) is fixedly mounted on a second support (51), the first sliding block (53) is in sliding fit with the first sliding rail (54), the second sliding block (55) is in sliding fit with the second sliding rail (56), two ends of the first sliding seat (52) are fixedly connected with the first sliding block (53) and the second sliding block (55) respectively, the first sliding block (53) is sleeved on the first screw rod, and the first motor drives the first screw rod to rotate so as to drive the first sliding block (53) to slide on the first sliding rail (54) and further drive the first sliding seat (52) to move left and right;

the back-and-forth movement assembly comprises a second motor, a second screw rod, a third sliding block (57) and a third sliding rail (58), the third sliding rail (58) and the second motor are fixedly mounted on the first sliding seat (52), the third sliding block (57) is in sliding fit with the third sliding rail (58), the third sliding block (57) is sleeved on the second screw rod, the up-and-down movement assembly is fixedly mounted on the third sliding block (57), and the second motor drives the second screw rod to rotate so as to drive the third sliding block (57) to slide on the third sliding rail (58) and further drive the up-and-down movement assembly to move back and forth;

the up-down moving assembly comprises a second sliding seat, a third motor, a third screw rod, a fourth sliding block (59) and a fourth sliding rail, the fourth sliding rail and the third motor are fixedly installed on the second sliding seat, the fourth sliding block (59) is in sliding fit with the fourth sliding rail, the fourth sliding block (59) is sleeved and installed on the third screw rod, the first gasket sucker is fixedly installed on the fourth sliding block (59), and the third motor drives the third screw rod to rotate so as to drive the fourth sliding block (59) to slide on the fourth sliding rail, so that the first gasket sucker is driven to move up and down.

4. The injection molding method of a chair armrest according to claim 1, wherein the discharging bar (32) comprises a vibrating electromagnet, a vibrating bracket (320) and a conveying guide rail (321), the conveying guide rail (321) is fixedly installed on the vibrating bracket (320) and is positioned above the vibrating bracket (320), the conveying guide rail (321) comprises an input end and an output end, the input end is connected with the vibrating plate (31), the output end is lower than the input end, and the first gasket suction cup sucks the gasket from the output end;

the vibrating electromagnet is fixedly arranged on the vibrating support (320), and transmits vibration to the conveying guide rail (321) through the vibrating support (320), so that the gasket on the conveying guide rail (321) moves from the input end to the output end.

5. The injection molding method of a chair armrest according to claim 4, wherein the conveying guide rail (321) comprises a top wall (3211), a bottom wall (3212), a left wall (3213) and a right wall (3214), a middle portion of the top wall (3211) is provided with a gap of equal length with the top wall (3211), the gap is oriented in the conveying direction of the gasket, a distance between the top wall (3211) and the bottom wall (3212) is greater than a thickness of one gasket and less than a thickness of 1.2 gaskets, a distance between the left wall (3213) and the right wall (3214) is greater than a diameter of one gasket and less than a diameter of 1.05 gaskets, and the top wall (3211) is at least less than a length of one gasket diameter of the bottom wall (3212).

6. The injection molding method of a chair armrest according to claim 1, wherein the first gasket mounting station (330), the second gasket mounting station (331), the third gasket mounting station (332), and the fourth gasket mounting station (333) each include a mounting circular truncated cone (334) and a positioning column (335), the positioning columns (335) are tapered positioning columns (335), and the circular truncated cone and the positioning columns (335) are coaxially distributed.

7. The injection molding method of a chair armrest according to claim 1, wherein the left-right moving mechanism comprises a fourth motor, a fourth screw, a fifth slider and a fifth slide rail, the fifth slide rail and the fourth motor are fixedly mounted on the first cross beam (40), the fifth slider and the fifth slide rail are in sliding fit, the fifth slider is mounted on the fourth screw in a sleeved manner, the second cross beam (41) is fixedly connected with the fifth slider, and the fourth motor drives the fourth screw to rotate so as to drive the fifth slider to slide on the fifth slide rail, thereby driving the second cross beam (41) to move left and right;

the front-back moving mechanism comprises a fifth motor, a fifth screw rod, a sixth sliding block and a sixth sliding rail, the sixth sliding rail and the fifth motor are fixedly mounted on a second cross beam (41), the sixth sliding block is in sliding fit with the sixth sliding rail, the sixth sliding block is sleeved on the fifth screw rod, the first mounting seat is fixedly connected with the sixth sliding block, and the fifth motor drives the fifth screw rod to rotate so as to drive the sixth sliding block to slide on the sixth sliding rail and further drive the first mounting seat to move front and back;

the up-down moving mechanism comprises a sixth motor, a sixth screw rod, a seventh sliding block and a seventh sliding rail, the seventh sliding rail and the sixth motor are fixedly installed on the first installation seat, the seventh sliding block is in sliding fit with the seventh sliding rail, the seventh sliding block is sleeved on the sixth screw rod, the first vertical beam (42) is fixedly connected with the seventh sliding block, and the sixth motor drives the sixth screw rod to rotate so as to drive the seventh sliding block to slide on the seventh sliding rail and further drive the first vertical beam (42) to move up and down.

8. The injection molding method for chair arm according to claim 1, wherein the eight proximity switches are installed on the first installation plate (430), and each proximity switch is arranged in an isosceles triangle with every two second gasket suction cups (432).

9. An injection molding system for a chair armrest, wherein the injection molding method for a chair armrest according to any one of claims 1 to 8 is used.