Fire-fighting spray head choke arm frame and processing technology thereof

Abstract

The fire-fighting spray head choke arm frame has a stainless steel disc body, the top surface of the stainless steel disc body has a sleeve integrally stretched upward, the hollow cylinder has an internal thread, the outer side wall of the stainless steel disc body has two choke arms integrally punched and bent, the two choke arms are oppositely arranged, the choke arm has a horizontal straight part, an inclined part and a vertical part, the inclined part is between the horizontal straight part and the vertical part, the inclined parts of the two choke arms form a horn space gradually expanding from top to bottom, the upper end of the inclined part is arc transitionally connected with the horizontal part, and the lower end of the inclined part is arc transitionally connected with the upper end of the vertical part. The fire-fighting spray head choke arm frame is integrally processed with the sleeve and the choke arm, welding is not needed, the machining process is greatly omitted, the machining cost is significantly reduced, and the structure of the whole choke arm frame is stable without welding operation. The application further discloses a machining process of the fire-fighting spray head choke arm frame.

Description

Technical Field

[0001] The invention relates to the field of fire sprinkler heads, in particular to a fire sprinkler head arm frame and a processing technology thereof. Background Art

[0002] Fire sprinkler heads are used in fire sprinkler systems. When a fire occurs, water is sprayed out through the sprinkler head's deflector to extinguish the fire. There are three types of fire sprinkler heads: pendant sprinkler heads, upright sprinkler heads, ordinary sprinkler heads, and sidewall sprinkler heads. Existing fire sprinkler heads generally include a threaded sleeve, a choke frame, a glass tube, and a deflector. The choke frame includes a support tube and two choke arms, which are located on either side of the support tube and are oppositely arranged. The upper ends of the choke arms are welded to the support tube. The threaded sleeve is located at the lower ends of the two choke arms and is welded to the choke arms. The glass tube is located between the threaded sleeve and the support tube, and between the two choke arms. The deflector is mounted on the top surface of the support tube. When in use, the threaded sleeve is connected to the water pipe. In the event of a fire, the glass tube ruptures as the temperature rises, causing water in the water pipe to be sprayed upward through the threaded sleeve to the deflector, where it is dispersed and sprayed out.

[0003] Currently, the processing method for the arm bracket of this type of fire sprinkler head is as described in the processing process of a fire sprinkler head bracket disclosed in Chinese invention patent application CN114986096A. The steel pipe material is heated to 1300-1400 degrees, and then the steel pipe material is subjected to a series of treatments to form a threaded tube. The steel plate is then punched into a U-shaped arm bracket, and finally the threaded tube and the arm bracket are welded together. This processing method is cumbersome and requires switching between different processing equipment during the processing, which increases the processing cost of the entire arm bracket. At the same time, if the welding method of the arm bracket and the threaded tube is not firm, it is easy for the threaded tube and the arm bracket to separate during later use, thereby affecting the use of the fire sprinkler head.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned issues, which resulted in the present case. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a fire sprinkler head yoke bracket which has low processing cost and ensures stable cooperation between the threaded sleeve and the yoke.

[0006] Another object of the present invention is to provide a processing technology for a fire sprinkler head yoke frame which has low processing cost, simple processing steps, and ensures stable cooperation between the threaded sleeve and the yoke.

[0007] In order to achieve the above object, the solution of the present application is: a fire-fighting spray head choke arm frame, which has a stainless steel disc body, the top surface of the stainless steel disc body has a sleeve integrally stretched upward, the sleeve is a hollow cylinder open at the top and bottom surfaces, the hollow cylinder has internal threads, the stainless steel disc body has a communication port corresponding to the sleeve and matching the sleeve, the outer side wall of the stainless steel disc body has two integrated stamping and bending formed choke arms, the two choke arms are oppositely arranged, the choke arm has a horizontal straight part, an inclined part and a vertical part, the inclined part is between the horizontal straight part and the vertical part, the inclined parts of the two choke arms form a horn space gradually expanding from top to bottom, the upper end of the inclined part is arc-shaped transitionally connected with the horizontal part, and the lower end of the inclined part is arc-shaped transitionally connected with the upper end of the vertical part.

[0008] A processing technology of a fire-fighting spray head choke arm frame is processed by the following steps:

[0009] Step one: preparing materials, preparing a stainless steel strip and a punch machine, the punch machine has a forming die, the length direction of the stainless steel strip is the left-right direction, and the forming die has a punching area, a stretching area, a hole forming area, a tapping area, a stamping area, a bending area and a shearing area arranged in sequence along the left-right direction;

[0010] Step two: positioning hole processing, conveying the stainless steel strip into the punching area to punch out a to-be-stretched strip with positioning holes on the front and rear sides of the stainless steel plate;

[0011] Step three: stretching forming, conveying the to-be-stretched strip to the stretching area to perform at least three times of upward lifting stretching, stretching out a to-be-hole-formed strip with a stretching structure, the stretching structure is located on the part between the front and rear positioning holes of the to-be-hole-formed strip, and the stretching structure is a hollow cylindrical block with an open bottom and a closed top, and the inner diameter of the hollow cylindrical block decreases with the increase of the number of stretching each time;

[0012] Step four: hole forming, conveying the to-be-hole-formed strip to the hole forming area to punch a circular hole on the top surface of the hollow cylindrical block of the to-be-hole-formed strip from bottom to top, and obtaining a to-be-tapped strip;

[0013] Step five: tapping, conveying the to-be-tapped strip to the tapping area to tap internal threads in the inner chamber of the hollow cylindrical block of the to-be-tapped strip, and obtaining a to-be-stamped strip;

[0014] Step six: stamping, conveying the to-be-stamped strip to the stamping area to stamp a stamping hole in the to-be-stamped strip, and forming a to-be-bent block in the stamping hole, obtaining a to-be-bent strip, the to-be-bent block has a circular bottom disc, the hollow cylindrical block on the circular bottom disc and the trapezoidal strip gradually expanding away from the circular bottom disc on the front and rear sides of the circular bottom disc, and the to-be-bent blocks adjacent to each other have a connecting horizontal strip for connecting the two circular bottom discs at the interval hole;

[0015] Step seven: bending, sending the to-be-bent strip to the bending area, cutting the parts of the to-be-bent strip located on the two sides of the partition hole before bending, and bending the trapezoidal strip at least twice after cutting to form a bending arm, so that the to-be-cut strip is obtained, the bending arm has a horizontal straight part connected with the circular base, a vertical part vertically arranged below the end of the horizontal part away from the circular base, and an inclined part between the horizontal straight part and the vertical part, the upper end of the inclined part is close to the circular base, and the lower end of the inclined part is away from the circular base;

[0016] Step eight: cutting, sending the to-be-cut strip to the cutting area, and punching the two ends of the connecting horizontal strip on the to-be-cut strip to completely separate the connecting horizontal strip from the circular base, so that the punched choke arm frame is obtained.

[0017] The above forming die has an upper die and a lower die, the lower die has a lower die seat, a lower die plate above the lower die seat, and a lower die column connecting the lower die seat and the lower die plate, the top surface of the lower die plate has a first lower die core, a second lower die core and a third lower die core arranged in sequence and spaced apart from left to right, the first lower die core and the third lower die core are fixedly installed and matched with the lower die plate, and the second lower die core is suspendedly installed above the lower die plate in a manner capable of ascending and descending and resetting, the upper die plate has an upper die plate, the upper die plate is in upper and lower position matching with the lower die plate, the bottom surface of the upper die plate has a first upper die core in upper and lower position matching with the first lower die core, a second upper die core in upper and lower position matching with the second lower die core, and a third upper die core in upper and lower position matching with the third lower die core, the first upper die core and the third upper die core are suspendedly installed below the upper die plate in a manner capable of ascending and descending and resetting, and the second upper die core is fixedly attached to the upper die plate, the punching area is arranged at the first upper die core and the first lower die core, the stretching area, the hole forming area and the tapping area are arranged at the second upper die core and the second lower die core, the punching area, the bending area and the cutting area are arranged at the third upper die core and the third lower die core, the top surfaces of the first lower die core and the third lower die core are flush, the top surface of the second lower die core is higher than the top surface of the first lower die core, the bottom surfaces of the first upper die core and the third upper die core are flush, and the bottom surface of the first upper die core is below the bottom surface of the second lower die core.

[0018] A first guide post is fixed on the upper template, and the first guide post passes downward through the first upper mold core, and the lower end of the first guide post has a limit head limited outside the bottom surface of the first upper mold core, and the top surface of the first lower mold core corresponds to the limit head and is concave with a guide recess for the limit head to extend into. A fixedly installed tensioning spring is provided between the upper template and the first upper mold core, and a plurality of punching needles arranged at intervals from left to right are fixed on the front and rear sides of the bottom of the first upper mold core, and the punching needles on the front side and the punching needles on the rear side form a needle row respectively. The lower end of the punching needle is a sharp structure that gradually shrinks from bottom to top; the above-mentioned first lower die core is provided with needle holes that pass through the upper and lower parts corresponding to each punching needle, and the lower template is provided with through openings corresponding to each needle hole. A number of first placement columns arranged at intervals from left to right are erected on the front and rear sides of the top surface of the above-mentioned first lower die core, and each placement column on the front side and each placement column on the back side respectively form a first placement column row, and the two needle rows are located between the two first placement column rows. The outer wall of the upper end of the above-mentioned first placement column is provided with a closed annular groove for the side of the stainless steel strip to be inserted into.

[0019] A plurality of positioning pins arranged at intervals from left to right are fixed on the front and rear sides of the bottom surface of the above-mentioned second upper mold core, and the punching pins are relative to the positioning holes. A second guide column passing through the second lower mold core is erected on the above-mentioned lower template. The upper end of the above-mentioned second guide column has a limiting head limited to the outside of the top surface of the second upper mold core and above the second upper mold core. The bottom surface of the above-mentioned second upper mold core is concavely provided with a guide hole for the limiting head to extend into the inside at the position corresponding to the second guide column. A tensioning spring is provided between the above-mentioned second lower mold core and the above-mentioned lower template. A plurality of positioning pins spaced along the left and right directions are fixed on the front and rear sides of the top surface of the above-mentioned second lower mold core. The second support columns are arranged at intervals and extend out of the second lower mold core. The second support columns on the front side and the second support columns on the rear side form a second support column row. The upper end portion of the above-mentioned second support columns extends upward with a reducing head extending out of the top surface of the second lower mold core. The upper end portion of the reducing head has a limiting head whose outer diameter is larger than the outer diameter of the reducing head. A receiving groove for the side edge of the stainless steel strip to be inserted into is formed between the limiting head and the top surface of the second support column. The above-mentioned second upper mold core is concavely provided with a lower groove for accommodating the reducing head and the limiting head together at each limiting head. The above-mentioned second lower mold core is located at The portion between the two second support column rows is provided with stretching holes, stamping holes and tapping holes that pass through from top to bottom. There are several stretching holes, and each stretching hole is arranged at intervals from left to right and the aperture decreases from left to right. There is one punching hole and one tapping hole, and the punching hole and the tapping hole are located on the right side of each stretching hole. The punching hole is located between the tapping hole and the stretching hole. A stretching punch corresponding to each stretching hole is fixedly erected on the lower template and extends into each stretching hole. The stretching punch is tightly fitted with the stretching hole. The bottom surface of the second upper die core is concavely provided with a punch for stretching corresponding to each stretching punch. The formed forming cavity, the top surface of the above-mentioned lower template is provided with a punching head extending into the punching hole corresponding to the punching hole and a tapping head rotatably installed to extend into the tapping hole corresponding to the tapping hole, the above-mentioned second upper die core is upwardly concave with a punching recess for the upper end of the punching head to extend into the inside corresponding to the punching head and a tapping recess for the upper end of the tapping head to extend into the inside corresponding to the tapping head, the areas of the above-mentioned second lower die core and the second upper die core corresponding to each stretching punch constitute the said stretching area, the area corresponding to the punching head constitutes the said hole forming area, and the area corresponding to the tapping hole constitutes the said tapping area.

[0020] The top surface of the lower die plate is provided with a plurality of third supporting rods arranged in the left-right direction and extending upward from the third lower die core on the front and rear sides of the stamping area. The third supporting rods on the front side and the third supporting rods on the rear side each form a third supporting rod row. The outer wall of the upper end of the third supporting rod is concave with a closed loop groove. The third lower die core is provided with a first stamping hole and a second stamping hole penetrating in the up-down direction between the two third supporting rod rows. The first stamping hole and the second stamping hole form the stamping hole. The first stamping hole and the second stamping hole are arranged in the left-right direction. The first stamping hole and the second stamping hole are strip-shaped holes extending in the front-rear direction. The central region of the strip-shaped hole is provided with a partition strip extending in the left-right direction. The left and right ends of the partition strip are provided with convex arc strips extending in the up-down direction. The convex arc surfaces of the two convex arc strips are arranged opposite to each other in the left-right direction. The diameter of the first stamping hole in the left-right direction is smaller than the diameter of the second stamping hole in the left-right direction. The first stamping hole is provided with a first front stamping hole on the front side of the partition strip and a first rear stamping hole on the rear side of the partition strip. The second stamping hole is provided with a second front stamping hole on the front side of the partition strip and a second rear stamping hole on the rear side of the partition strip. The bottom surface of the lower die plate is provided with a first stamping head tightly fitted through the third lower die core corresponding to the first front stamping hole and the first rear stamping hole. The bottom surface of the lower die plate is provided with a second stamping head tightly fitted through the third lower die core corresponding to the second front stamping hole and the second rear stamping hole. The third upper die core is provided with two strip-shaped cutting holes extending in the left-right direction and arranged opposite to each other on the right side of the second stamping hole. The bottom surface of the lower die plate is provided with a cutting head installed at the strip-shaped cutting hole. The second stamping holes fall between the two strip-shaped cutting holes.

[0021] The third lower die core is provided with a strip-shaped bending hole extending along the left-right direction at the bending area, the right end of the strip-shaped bending hole is outside the right side surface of the third lower die core, the inner bottom surface of the strip-shaped bending hole is provided with a strip-shaped convex strip extending along the left-right direction, the strip-shaped convex strip has a left diameter expansion section and a right diameter reduction section, the strip-shaped bending hole has a left hole expansion section and a right hole reduction section, the left diameter expansion section is located in the left hole expansion section, the left end of the right diameter reduction section is located in the left hole expansion section, and the right end of the right diameter reduction section is located in the right hole reduction section, the left end of the left diameter expansion section is provided with a left lower bending block connected with the hole wall of the left hole expansion section on the front and rear side walls, the top surfaces of the two left lower bending blocks are left lower inclined surfaces inclined downward, and the two left lower inclined surfaces have a horn structure gradually expanding from top to bottom, the bottom surface of the lower die plate is provided with left upper bending blocks capable of tightly fitting through the third upper die core at positions corresponding to the left lower bending blocks, the bottom surfaces of the two left upper bending blocks are left upper inclined surfaces inclined upward, the left upper inclined surfaces are located opposite to the left lower inclined surfaces, and the two left upper inclined surfaces have a horn structure gradually reducing from bottom to top, the front and rear side walls of the left end of the right diameter reduction section are provided with right lower bending blocks having a spacing with the hole wall of the left hole expansion section, the top surfaces of the two right lower bending blocks have right lower inclined surfaces inclined downward on opposite sides, the two right lower inclined surfaces have a horn structure gradually expanding from top to bottom, the bottom surface of the lower die plate is provided with right upper bending blocks capable of tightly fitting through the third upper die core at positions corresponding to the right lower bending blocks, the bottom surfaces of the two right upper bending blocks are right upper inclined surfaces inclined upward, the right upper inclined surfaces are located opposite to the right lower inclined surfaces, and the two right upper inclined surfaces have a horn structure gradually reducing from bottom to top.

[0022] The right end top surface of the right diameter reduction section is provided with a shearing hole penetrating along the up-down direction, the shearing hole is a strip-shaped cutting hole extending along the front-back direction, the left hole wall and the right hole wall of the strip-shaped cutting hole are convex arc walls, the convex arc surfaces of the two convex arc walls are located opposite to each other, the lower die plate is provided with a strip-shaped cutting knife capable of tightly fitting through the third lower die core and matching with the strip-shaped cutting hole at positions corresponding to the strip-shaped cutting hole, and the strip-shaped cutting knife and the strip-shaped cutting hole form the shearing area.

[0023] The top surface of the right side of the first lower die core is provided with a supporting convex block, and the top surface of the supporting convex block is flush with the top surface of the second lower die core.

[0024] After the above technical scheme is adopted, the choke arm frame, the sleeve and the choke arm of the fire-fighting spray head are integrally machined, welding is not required, the machining process is greatly omitted, the machining cost is significantly reduced, and the welding operation is not required, so that the structure of the whole choke arm frame is stable. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of a forming die;

[0026] Figure 2 It is a perspective view of a lower die;

[0027] Figure 3 is a three-dimensional diagram of the upper mold;

[0028] Figure 4 Schematic diagram of the forming of stainless steel strips. DETAILED DESCRIPTION

[0029] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0030] A fire sprinkler arm bracket of the present invention, such as Figure 4 As shown, it has a stainless steel disc body 100, and the top surface of the stainless steel disc body has a sleeve 101 that is stretched upward as an integral body. This sleeve 101 is a hollow cylinder with open top and bottom surfaces, and the hollow cylinder has an internal thread. The stainless steel disc body 100 has a connecting port (not shown in the figure) that matches and connects with the sleeve corresponding to the sleeve 101. The outer wall of the stainless steel disc body 100 has two integrally stamped and bent choke arms 102, which are arranged opposite to each other. The choke arm 102 has a horizontal portion, an inclined portion and a vertical portion. The inclined portion is between the horizontal portion and the vertical portion. The inclined portions of the two choke arms constitute a speaker space that gradually expands from top to bottom. The upper end of the inclined portion is connected to the horizontal portion in an arc-shaped transition, and the lower end of the inclined portion is connected to the upper end of the vertical portion in an arc-shaped transition.

[0031] In the fire sprinkler head arm frame of the present invention, the stainless steel disc body 100, the sleeve 101 and the arm 102 are integrally processed, so that the entire arm frame is formed in one piece, and no welding is required, which greatly omits the processing steps and significantly reduces the processing cost. In addition, there is no welding operation, so the structure of the entire arm frame is stable.

[0032] The present invention provides a processing technology for a fire sprinkler head arm frame, which is processed by the following steps:

[0033] Step 1: Prepare the material, prepare the stainless steel strip 200 and the punching machine, the punching machine has a forming die, with the length direction of the stainless steel strip as the left and right direction, the forming die has a punching area, a stretching area, a hole forming area, a tapping area, a stamping area, a bending area and a shearing area arranged in sequence along the left and right directions; Figures 1-3 As shown, specifically, the forming mold includes an upper mold and a lower mold, the lower mold includes a lower mold base 11, a lower mold plate 12 located above the lower mold base, and a lower mold column 13 connecting the lower mold base and the lower mold plate, the top surface of the lower mold plate 12 includes a first lower mold core 14, a second lower mold core 15, and a third lower mold core 16 arranged in sequence from left to right, the first lower mold core 14 and the third lower mold core 16 are fixedly mounted and matched with the lower mold plate 12, the second lower mold core 15 is suspended above the lower mold plate 12 in a manner that it can be lifted up and down and reset, the top surface of the second lower mold core 15 is higher than the top surface of the first lower mold core 14, and the top surface of the first lower mold core is flush with the top surface of the third lower mold core;

[0034] The upper die has an upper die plate 21 which is in upper and lower position matching with the lower die plate 12. The bottom surface of the upper die plate 21 has a first upper die core 22 which is in upper and lower position matching with the first lower die core, a second upper die core 23 which is in upper and lower position matching with the second lower die core and a third upper die core 24 which is in upper and lower position matching with the third lower die core. The first upper die core 22 and the third upper die core 24 are suspendedly installed below the upper die plate 21 in a way that they can be moved up and down and reset. Preferably, the upper die plate 21 is fixed with guide columns (not shown in the figure) at the positions corresponding to the first upper die core and the third upper die core respectively. The second upper die core 23 is fixedly matched with the upper die plate 21. The bottom surface of the first upper die core is flush with the bottom surface of the third upper die core. The bottom surface of the second upper die core is higher than the bottom surface of the first upper die core. The punching area is arranged at the first upper die core and the first lower die core. The drawing area, the hole forming area and the tapping area are arranged at the second upper die core and the second lower die core. The stamping area, the bending area and the shearing area are arranged at the third upper die core and the third lower die core.

[0035] Step 2: Positioning hole processing, the stainless steel strip is transported to the punching area, and the positioning holes for the strips to be stretched are punched out on the front and rear sides of the stainless steel plate; specifically, the stainless steel strip 200 is suspended, and a first guide column 211 is fixed on the upper template 21. Preferably, four first guide columns 211 are provided, and two first guide columns 211 are arranged at intervals on the front and rear sides of the upper template 21. The first guide columns pass downward through the first upper die core 22, and the lower end of the first guide column has a limit head (not shown in the figure) that is limited outside the bottom surface of the first upper die core. A tension spring is fixedly installed between the upper template 21 and the first upper die core 22. The top surface of the first lower die core 14 corresponds to the limit head and is concave with a guide recess 141 for the limit head to extend into. A plurality of punching needles 221 arranged at intervals from left to right are fixed on the front and rear sides of the bottom of the first upper die core 22. The lower end of the punching needle 221 is a sharp structure that tapers from bottom to top, and the bottom surface of the punching needle 221 is a convex arc surface. Each punching needle on the front side and each punching needle on the back side respectively form a needle row; the first lower die core 14 corresponds to each There are needle holes that pass through the upper and lower parts of the punching needles one by one, and the lower template 12 is provided with a through opening corresponding to each needle hole. A plurality of first placement columns 142 are erected on the front and rear sides of the top surface of the first lower mold core 14, and are spaced from left to right. The placement columns on the front side and the placement columns on the rear side form a first placement column row, and the two needle rows are located between the two first placement column rows. The outer side wall of the upper end of the first placement column 142 is located on the top surface of the second lower mold core and is concave with a closed annular groove for inserting the side of the stainless steel strip (not shown in the figure) As shown), when used, the stainless steel strip 200 is conveyed from left to right into the first lower die, and the front and rear side edges of the stainless steel strip 200 are stuck in the closed annular groove of the first placement column row to clamp the stainless steel strip 200. When the left end of the stainless steel strip 200 is conveyed to the right end of the first lower die, the lower die moves downward, and the punching needle hole on the first upper die punches out the positioning hole 201 for the stainless steel strip 200. The punched waste falls out through the needle hole and the through port, and the tensioning spring on the first upper die is used to facilitate demolding between the punching needle hole and the stainless steel strip.

[0036] Step three: stretching and forming, conveying the strip to be stretched to the stretching area, and performing at least three times of lifting and stretching from bottom to top to stretch out a strip to be holed with a stretching structure, the stretching structure is located between the front and rear positioning holes in the strip to be holed, and the stretching structure is a hollow cylindrical block with an open bottom and a closed top. During stretching, the inner diameter of the hollow cylindrical block is gradually reduced with the increasing number of stretching times. Specifically, a plurality of positioning pins 231 arranged at intervals from left to right are fixed on the front and rear sides of the bottom of the second upper die core 23, and the punching needle 221 is positioned relative to the positioning pin 231. A second guide column 121 passing through the second lower die core is erected on the lower template 12, and the upper end of the second guide column 121 is fixed with a limiting head whose outer diameter is larger than the inner diameter of the guide hole. The bottom surface of the mold core 23 corresponds to the limit head and is recessed with a guide hole for the limit head to extend into. A tensioning spring (not shown in the figure) is provided between the second lower mold core and the lower template. A plurality of second support columns 151 are fixed on the front and rear sides of the top of the second lower mold core 15, which are arranged at intervals in the left and right directions and extend out of the second lower mold core 15. The second support columns on the front side and the second support columns on the rear side form a second support column row. The upper end of the second support column 151 extends upward with a reducing head extending out of the top surface of the second lower mold core. The upper end of the reducing head has a limiting head whose outer diameter is larger than the outer diameter of the reducing head. A accommodating groove for the side edge of the stainless steel strip to be inserted into is formed between the limiting head and the top surface of the second support column. The second upper mold core 23 corresponds to each limit The position head is provided with a lower groove 232 for accommodating the reducing head and the limiting head together. The second lower die core 15 is provided with a stretching hole 152 running through the upper and lower parts at the position between the two second support column rows. Preferably, there are three stretching holes 152. Each stretching hole 152 is arranged at intervals from left to right and the aperture decreases in sequence from left to right. A stretching punch 3 corresponding to each stretching hole 152 is fixedly erected on the lower template 12. The stretching punch is tightly fitted with the stretching hole. The three stretching punches 3 are divided into a first punch, a second punch and a third punch from left to right. The first punch, the second punch and the third punch are all cylindrical rods. The upper end of the first punch, the upper end of the second punch and the upper end of the third punch are all frustum structures that taper from bottom to top, and the frustum The side wall of the structure is an arc surface, and the diameter of the frustum structure of the first punch, the diameter of the frustum structure of the second punch, and the diameter of the frustum structure of the third punch decrease in sequence. The height of the frustum structure of the first punch, the height of the frustum structure of the second punch, and the height of the frustum structure of the third punch decrease in sequence. The bottom surface of the second upper die 23 is concavely provided with a forming cavity 233 for stretching corresponding to each stretching punch. The central area of ​​the forming cavity 233 has a tightening cylinder. This tightening cylinder is used for forming the top surface of the stretching structure with a plane center. The second lower die and the second upper die corresponding to the areas of each stretching punch constitute the stretching area. When used, the strip to be stretched is placed flat on the second lower die 15. When the strip to be stretched is translated to the first punch, the upper die moves down.The upper die and the lower die are closed, the second lower die core moves down, the first punch extends out of the second lower die core and lifts up the part of the to-be-stretched strip located here to the forming cavity opposite to the first punch, when the mold is opened, the tension spring on the second lower die core can lift up the second lower die core and the to-be-stretched strip, so that the first punch and the to-be-stretched strip are demolded, because the first punch and the second punch have a certain distance, the to-be-stretched strip is moved to the second punch, and the to-be-stretched strip is repeatedly closed and opened, so that a plurality of first stretched blocks 202 are formed on the to-be-stretched strip from left to right, when the to-be-stretched strip is stretched, the positioning pin 231 is inserted into the positioning hole 201, so that the to-be-stretched strip is positioned and stretched, the to-be-stretched strip is moved to the second punch, and the operation mode of the first punch is the same, so that a plurality of second stretched blocks 203 are formed on the to-be-stretched strip from left to right, the to-be-stretched strip is moved to the third punch, and the operation mode of the first punch is the same, so that a plurality of third stretched blocks 204 are formed on the to-be-stretched strip from left to right, the third stretched block 204 is a hollow cylindrical block.

[0037] Step four: hole forming, the to-be-hole-formed strip is transported to the hole forming area, a circular hole is punched on the top surface of the hollow cylindrical block on the to-be-hole-formed strip from bottom to top, and a to-be-tapped strip is obtained; specifically, the lower die plate 12 is vertically provided with a punching head 4 outside the right side of the third punch, the second lower die core is provided with a punching hole penetrating up and down at the position corresponding to the punching head, the lower die plate 12 is provided with a blanking hole penetrating up and down at the position corresponding to the punching hole, the second upper die core is concavely provided with a punching recess for the upper end of the punching head 4 to extend into at the position corresponding to the punching head 4, and the lower die plate and the upper die plate constitute the hole forming area at the position corresponding to the punching head. In application, when the upper die and the lower die are closed, the second lower die core moves down to extend the punching head, and the to-be-hole-formed strip can move up and down in the accommodation groove of the second supporting column, so that the punching head punches a circular hole 205 in the third stretched block 204.

[0038] Step five: tapping, the to-be-tapped strip is transported to the tapping area, internal threads are tapped in the inner cavity of the hollow cylindrical block of the to-be-tapped strip, and a to-be-stamped strip is obtained; preferably, the lower die plate 12 is vertically provided with a tapping head 5 outside the right side of the punching head 4, the tapping head 5 is rotatably installed, the lower die plate 12 is provided with a motor for controlling the rotation of the tapping head 5, the second lower die core 15 is provided with a tapping hole (not shown in the figure) penetrating up and down at the position corresponding to the tapping head 5, the second upper die core is concavely provided with a tapping recess for the upper end of the tapping head 5 to extend into at the position corresponding to the tapping head 5, the lower die plate and the upper die plate constitute the tapping area at the position corresponding to the tapping head, and in application, when the upper die and the lower die are closed, the second lower die core moves down to extend the tapping head, and the to-be-hole-formed strip can move up and down in the accommodation groove of the second supporting column, so that the tapping head rotates in the third stretched block 204 and taps the inner side wall of the third stretched block 204, and the tapping mode is the same as the existing tapping mode, which will not be repeated here.

[0039] Step six: stamping, sending the to-be-stamped strip to the stamping area, stamping the to-be-stamped strip to stamp the stamping hole, the stamping hole having the to-be-bent block 206, obtaining the to-be-bent strip, the to-be-bent block having the circular base plate, the hollow cylindrical block on the circular base plate, and the trapezoidal strip gradually expanding on the front and back sides of the circular base plate and away from the direction of the circular base plate, and the left and right adjacent to-be-bent blocks having the connecting horizontal strip for connecting the two circular base plates at the interval hole;Specifically, the lifting and lowering installation method of the third upper mold core is the same as that of the first upper mold core, that is, a third guide column 212 is fixed on the upper mold core 21, and four third guide columns 212 are preferably provided. Two third guide columns 212 are arranged at intervals on the front and rear sides of the upper mold core 21. The third guide column passes downward through the third upper mold core 24, and the lower end of the third guide column has a limit head (not shown in the figure) limited to the outside of the bottom surface of the third upper mold core. A fixedly installed tensioning spring is provided between the upper mold core 21 and the third upper mold core 24. The top surface of the third lower mold core 16 corresponds to the limit head and is recessed with a guide recess (not shown in the figure) for the limit head to extend into. The top front and rear of the lower mold core 12 A plurality of third support rods 161 are fixed on the side of the stamping area, which are arranged at intervals in the left and right directions and extend upward from the third lower die core 16. The third support rods on the front side and the third support rods on the rear side respectively constitute a third support rod row. The top surface of the third lower die core is lower than the top surface of the second lower die core. The outer wall of the upper end of the third support rod 161 is concavely provided with a closed annular groove (not shown in the figure) at the top surface of the second upper die core. The third lower die core 16 is located between the two third support rod rows and is provided with a first stamping hole 162 and a second stamping hole 163 that penetrates in the up and down directions. The lower template has a blanking opening corresponding to the first stamping hole and the second stamping hole. The first stamping hole 1 62 and the second punching hole 163 constitute the punching hole, the first punching hole 162 and the second punching hole 163 are arranged at intervals on the left and right, the first punching hole and the second punching hole are both strip holes extending in the front-to-back direction, the central area of ​​the strip hole is provided with a partition bar 164 extending in the left-right direction, the left and right ends of the partition bar are convexly provided with convex arc bars extending in the up-down direction, the convex arc surfaces of the two convex arc bars are arranged oppositely on the left and right sides, the left-right diameter of the first punching hole is smaller than the left-right diameter of the above-mentioned second punching hole, the first punching hole 162 corresponds to the partition bar to form a first front punching hole and a first rear punching hole, the second punching hole 163 corresponds to the partition bar to form a second front punching hole and a second rear punching hole, the upper die The plate 21 is provided with a first punching head 51 that can tightly fit through the third upper die core at positions corresponding to the first front punching hole and the first rear punching hole. The first punching head corresponding to the first front punching hole has the same structure as the first punching head corresponding to the first rear punching hole and is symmetrically arranged. The upper template 21 is provided with a second punching head 52 that can tightly fit through the third upper die core at positions corresponding to the second front punching hole and the second rear punching hole, that is, the second punching head corresponding to the second front punching hole has the same structure as the second punching head corresponding to the second rear punching hole and is symmetrically arranged. A through hole for the first punching head to tightly fit through is opened on the third upper die core corresponding to the first punching head, and a through hole for the second punching head to tightly fit through is opened at the position corresponding to the second punching head.When in use, the upper die and the lower die are combined, the third upper die core moves up, the two first stamping heads 51 extend out of the third upper die core, and the to-be-stamped strip is suspended by the support of the third support column 161. In this way, the two first stamping heads 51 can punch out the first through hole on the left side of the first third stretching block 204 at the right end of the to-be-stamped strip, and the material punched out falls out of the first stamping hole. Then, the to-be-stamped strip continues to move right to the second stamping head 52, and the second through hole is punched out on the right side of the third stretching block 204, and finally the to-be-bent block 206 is obtained.

[0040] Step seven: bending, sending the to-be-bent strip to the bending area, cutting the parts outside the to-be-bent strip on the front and back sides of the separation hole before bending, and bending the trapezoidal strip at least twice after cutting to form a bent block with a bent arm 207, thereby obtaining a to-be-cut strip, the bent arm has a horizontal straight part connected with the circular base, a vertical part vertically arranged below the end of the horizontal part away from the circular base, and an inclined part between the horizontal straight part and the vertical part, the upper end of the inclined part is close to the circular base, and the lower end of the inclined part is away from the circular base; specifically, the third lower die core 16 is located on the right side of the second punching hole 163 and has two strip-shaped cutting holes 165 arranged opposite to each other and extending in the left-right direction, a punch cutting head 6 capable of tightly fitting out of the third upper die core is installed on the bottom surface of the lower die plate at the strip-shaped cutting hole 165, and the two second punching holes fall between the two strip-shaped cutting holes.The third lower die core 16 is located in the bending area and is provided with a strip-shaped bending hole (not shown in the figure) extending in the left-right direction. The right end of the strip-shaped bending hole passes through the right side of the third lower die core 16. The inner bottom surface of the strip-shaped bending hole is upwardly protruded with a strip-shaped ridge 166 extending in the left-right direction. The strip-shaped ridge 166 has a left diameter expansion section and a right diameter reduction section. The left diameter expansion section and the right diameter reduction section are both rectangular blocks extending in the left-right direction. The strip-shaped bending hole correspondingly has a left expansion hole and a right shrinkage hole. The left expansion hole and the right shrinkage hole are also rectangular holes. The left diameter expansion section is in the left expansion hole, and the right shrinkage section is in the right shrinkage hole. The left end of the diameter section is in the left expanded hole, and the right end is in the right shrinkage hole. The front and rear side walls of the left expanded diameter section are both convexly provided with a left lower bending block 167 connected to the left expanded hole wall. The side faces opposite to the two left lower bending blocks 167 are both connected to the inner hole wall of the left expanded hole. The top surfaces of the two left lower bending blocks 167 are downwardly inclined left lower inclined surfaces, and the two left lower inclined surfaces are in a horn structure that gradually expands from top to bottom. The bottom surface of the upper template corresponds to the two left lower bending blocks 167 and is convexly provided with a left upper bending block 71 that can fit tightly through the third upper die core. The corresponding upper die core A through hole is provided at the upper left bending block for the upper left bending block to fit through tightly. The bottom surfaces of the two upper left bending blocks 71 are upper left inclined surfaces inclined upward. The upper left inclined surfaces are arranged relative to the lower left inclined surfaces. The two upper left inclined surfaces constitute a horn structure that gradually shrinks from bottom to top. The right reduced diameter section is located on the front and rear side walls of the left expanded hole. Both sides are convexly provided with a right lower bending block 168 with a spacing between them and the left expanded hole wall. The side opposite to the top surface of the two lower right bending blocks 168 is a downwardly inclined right lower inclined surface, that is, the front side of the top of the lower right bending block on the front side and the top of the lower right bending block on the rear side. The rear sides of the top surfaces of the lower right bending blocks on the sides are both downwardly inclined right lower inclined surfaces, and the two lower right inclined surfaces are in a horn structure that gradually expands from top to bottom. The bottom surface of the upper template is convex downwardly provided with a right upper bending block 72 that can fit tightly through the third upper die core at the positions corresponding to the two lower right bending blocks. A through hole for the upper right bending block to fit tightly through is provided on the third upper die core corresponding to the upper right bending block. The bottom surfaces of the two upper right bending blocks 72 are upwardly inclined right upper inclined surfaces, and the upper right inclined surface is arranged opposite to the lower right inclined surface. The two upper right inclined surfaces constitute a horn structure that gradually shrinks from bottom to top.In application, the upper die and the lower die are combined, the bending strip is suspended by the third supporting column, the third upper die core moves up, the punching head 6 is exposed to punch the two sides of the bending block 206 located on the two trapezoidal strips, a single bending block 206 is obtained, the upper die and the lower die are separated, the punching head and the bending strip are separated quickly by the reset spring during the separation, and the right movement continues, and when the left upper bending block 71 is reached, the upper die and the lower die are combined, the cooperation of the left upper bending block 71 and the left lower bending block 167 can bend the trapezoidal strip of the bending block 206 downward, so that the trapezoidal strip becomes an inclined strip 208, the die is separated, and the right movement continues, and when the right upper bending block 72 is reached, the upper die and the lower die are combined, the cooperation of the right upper bending block 72 and the right lower bending block 168 can bend the inclined strip 208 into a bending arm 207 to obtain a bending block, in addition, the punching area and the bending area have a certain interval, so that a plurality of bending blocks 206 can be formed between the punching area and the bending area, and the trapezoidal strips of the bending blocks between the left upper bending block and the right upper bending block are bent into inclined strips.

[0041] Step eight: shearing, the to-be-cut strip is sent to the shearing area, the two ends of the connecting horizontal strip on the to-be-cut strip are punched, the connecting horizontal strip is completely separated from the circular bottom disc, and a punched choke arm frame is obtained; preferably, the top surface of the right diameter reducing section is provided with a shearing hole 169 extending in the upward and downward direction on the right side downward, the shearing hole 169 is a strip-shaped cut hole extending in the front and back direction, the lower die plate is provided with a through hole connected with the shearing hole, the left hole wall and the right hole wall of the strip-shaped cut hole are convex arc walls, the convex arc surfaces of the two convex arc walls are arranged left and right, the upper die plate is provided with a strip-shaped cutter 8 capable of tightly fitting through the third upper die core at the position corresponding to the strip-shaped cut hole, the third upper die core is provided with a through hole for the strip-shaped cutter to tightly fit through at the position corresponding to the strip-shaped cutter, the strip-shaped cutter is arranged in the shearing hole, and the strip-shaped cutter and the strip-shaped cut hole constitute the shearing area; in application, because the bending area and the shearing area have a certain interval, a plurality of bending blocks are formed between the bending area and the shearing area, the to-be-cut strip is conveyed to the right of the strip-shaped cutter 8, the upper die and the lower die are combined, the to-be-cut strip is suspended, the third upper die core moves up, the strip-shaped cutter 8 is exposed, the connecting horizontal strip 209 between the two bending blocks of the to-be-cut strip is cut off, and finally the choke arm frame is obtained.

[0042] The processing technology of the fire-fighting spray head choke arm frame only needs to place a stainless steel strip on the forming die of the punching machine, then the stainless steel strip is straightly conveyed and the forming die is combined and separated for multiple times, so that the choke arm frame is integrally processed, the welding process is not needed, the whole process is simple, the processing procedure is greatly omitted, the processing cost is significantly reduced, the welding operation is not needed, the structure of the whole choke arm frame is stable, the structure of the whole forming die is simple, the operation is simple, professional persons are not needed, and the production cost is further reduced.

[0043] In the present application, the top surface right side of the first lower die core is provided with a support bump 143 for supporting the stainless steel strip, and the support bump 143 can play a role in demolding the stainless steel strip during stretching.

[0044] The above embodiments and drawings are not limited to the product shape and style of the present application, and any appropriate changes or modifications made by those skilled in the art shall be considered as not departing from the scope of the present application.

Claims

1. A processing technology for a fire sprinkler head arm bracket, characterized in that: The fire sprinkler head arm frame has a stainless steel disc body, the top surface of the stainless steel disc body has a sleeve that is stretched upward as an integral body, and the sleeve is a hollow cylinder with both the top and bottom surfaces open. The hollow cylinder has an internal thread, and the stainless steel disc body has a connecting port that matches and communicates with the sleeve at the corresponding sleeve. The outer wall of the above-mentioned stainless steel disc body has two integrally stamped and bent arm arms, which are arranged opposite to each other, and the arm arms have a horizontal portion, an inclined portion and a vertical portion. The inclined portion is between the horizontal portion and the vertical portion, and the inclined portions of the two arm arms constitute a horn space that gradually expands from top to bottom. The upper end of the inclined portion is connected to the horizontal portion in an arc-shaped transition, and the lower end of the inclined portion is connected to the upper end of the vertical portion in an arc-shaped transition. The fire sprinkler head arm bracket is manufactured through the following steps: Step 1: Prepare the materials, prepare the stainless steel strips and the punching machine, the punching machine has a forming die, with the length direction of the stainless steel strip as the left and right direction, and the forming die has a punching area, a stretching area, a hole forming area, a tapping area, a stamping area, a bending area and a shearing area arranged in sequence along the left and right directions; Step 2: Positioning hole processing: transport the stainless steel strips to the punching area, and punch out the positioning holes on the front and rear sides of the stainless steel plate for the strips to be stretched; Step 3: stretching and forming, conveying the strip to be stretched to the stretching zone, and performing at least three upward stretching from bottom to top to stretch out a strip to be perforated with a stretching structure. The stretching structure is located between the front and rear positioning holes in the strip to be perforated, and the stretching structure is a hollow cylindrical block with an open bottom and a closed top. During each stretching, the inner diameter of the hollow cylindrical block decreases as the number of stretching times increases. Step 4: Hole forming: the rod to be holed is transported to the hole forming area, and a circular hole is punched from bottom to top on the top surface of the hollow cylindrical block on the rod to be holed to obtain the rod to be tapped; Step 5: Tapping: The strip to be tapped is conveyed to the tapping area, and the inner cavity of the hollow cylindrical block of the strip to be tapped is tapped to form an internal thread to obtain the strip to be stamped; Step 6: stamping, sending the strip to be stamped to the stamping area, punching a punching hole in the strip to be stamped, and forming a block to be bent in the punching hole to obtain the strip to be bent, which has a circular chassis, the above-mentioned hollow cylindrical block on the circular chassis, and a trapezoidal bar located on the front and rear sides of the circular chassis and gradually expanding in the direction away from the circular chassis. The left and right adjacent blocks to be bent are located at the spacing hole and have a connecting horizontal bar for connecting the two circular chassis; Step seven: Bending, sending the strip to be bent to the bending area, cutting the strip to be bent at the parts outside the front and rear sides of the separation hole before bending, and bending the trapezoidal strip at least twice after cutting to form a bending arm of the trapezoidal strip to obtain a strip to be sheared, wherein the bending arm comprises a horizontal portion connected to the circular chassis, a vertical portion standing below one end of the horizontal portion facing away from the circular chassis, and an inclined portion inclined downward between the horizontal portion and the vertical portion, wherein the upper end of the inclined portion is close to the circular chassis, and the lower end of the inclined portion is away from the circular chassis; Step 8: Shearing: Send the strip to be sheared to the shearing area, and punch out the two ends of the connecting horizontal bars on the strip to be sheared, so that the connecting horizontal bars are completely separated from the circular chassis, and the punched arm frame is obtained.

2. The processing technology of the fire sprinkler head arm bracket according to claim 1 is characterized in that: The above-mentioned forming mold comprises an upper mold and a lower mold, the lower mold comprises a lower mold base, a lower mold plate located above the lower mold base, and a lower mold column connecting the lower mold base and the lower mold plate, the top surface of the lower mold plate comprises a first lower mold core, a second lower mold core, and a third lower mold core arranged in sequence from left to right, the first lower mold core and the third lower mold core are fixedly mounted and matched with the lower mold plate, and the second lower mold core is suspended above the lower mold plate in a manner that it can be moved up and down and reset. The above-mentioned upper mold has an upper mold plate, and the upper mold plate is matched with the lower mold plate in upper and lower positions. The bottom surface of the upper mold plate has a first upper mold core that is matched with the first lower mold core in upper and lower positions, a second upper mold core that is matched with the second lower mold core in upper and lower positions, and a third upper mold core that is matched with the third lower mold core in upper and lower positions. The first upper mold core and the third upper mold core are suspended below the upper mold plate in a manner that they can be lifted up and down and reset. The second upper mold core is fixedly matched with the upper mold plate. The above-mentioned punching area is arranged at the first upper mold core and the first lower mold core, the above-mentioned stretching area, hole forming area and tapping area are arranged at the second upper mold core and the second lower mold core, the above-mentioned stamping area, bending area and shearing area are arranged at the third upper mold core and the third lower mold core, the top surfaces of the first lower mold core and the third lower mold core are flush, the top surface of the second lower mold core is higher than the top surface of the first lower mold core, the bottom surfaces of the first upper mold core and the third upper mold core are flush, and the bottom surface of the first upper mold core is below the bottom surface of the second lower mold core.

3. The processing technology of the fire sprinkler head arm according to claim 2 is characterized in that: A first guide post is fixed on the upper template, and the first guide post passes downward through the first upper mold core, and the lower end of the first guide post has a limit head limited outside the bottom surface of the first upper mold core, and the top surface of the first lower mold core corresponds to the limit head and is concave with a guide recess for the limit head to extend into. A fixedly installed tensioning spring is provided between the upper template and the first upper mold core, and a plurality of punching needles arranged at intervals from left to right are fixed on the front and rear sides of the bottom of the first upper mold core, and the punching needles on the front side and the punching needles on the rear side form a needle row respectively. The lower end of the punching needle is a sharp structure that gradually shrinks from bottom to top; the above-mentioned first lower die core is provided with needle holes that pass through the upper and lower parts corresponding to each punching needle, and the lower template is provided with through openings corresponding to each needle hole. A number of first placement columns arranged at intervals from left to right are erected on the front and rear sides of the top surface of the above-mentioned first lower die core, and each placement column on the front side and each placement column on the back side respectively form a first placement column row, and the two needle rows are located between the two first placement column rows. The outer wall of the upper end of the above-mentioned first placement column is provided with a closed annular groove for the side of the stainless steel strip to be inserted into.

4. The processing technology of the fire sprinkler head arm according to claim 2 is characterized in that: A plurality of positioning pins arranged at intervals from left to right are fixed on the front and rear sides of the bottom surface of the above-mentioned second upper mold core, and the punching pins are relative to the positioning holes. A second guide column passing through the second lower mold core is erected on the above-mentioned lower template. The upper end of the above-mentioned second guide column has a limiting head limited to the outside of the top surface of the second upper mold core and above the second upper mold core. The bottom surface of the above-mentioned second upper mold core is concavely provided with a guide hole for the limiting head to extend into the inside at the position corresponding to the second guide column. A tensioning spring is provided between the above-mentioned second lower mold core and the above-mentioned lower template. A plurality of positioning pins spaced along the left and right directions are fixed on the front and rear sides of the top surface of the above-mentioned second lower mold core. The second support columns are arranged at intervals and extend out of the second lower mold core. The second support columns on the front side and the second support columns on the rear side form a second support column row. The upper end portion of the above-mentioned second support columns extends upward with a reducing head extending out of the top surface of the second lower mold core. The upper end portion of the reducing head has a limiting head whose outer diameter is larger than the outer diameter of the reducing head. A receiving groove for the side edge of the stainless steel strip to be inserted into is formed between the limiting head and the top surface of the second support column. The above-mentioned second upper mold core is concavely provided with a lower groove for accommodating the reducing head and the limiting head together at each limiting head. The above-mentioned second lower mold core is located at The portion between the two second support column rows is provided with stretching holes, stamping holes and tapping holes that pass through from top to bottom. There are several stretching holes, and each stretching hole is arranged at intervals from left to right and the aperture decreases from left to right. There is one punching hole and one tapping hole, and the punching hole and the tapping hole are located on the right side of each stretching hole. The punching hole is located between the tapping hole and the stretching hole. A stretching punch corresponding to each stretching hole is fixedly erected on the lower template and extends into each stretching hole. The stretching punch is tightly fitted with the stretching hole. The bottom surface of the second upper die core is concavely provided with a punch for stretching corresponding to each stretching punch. The formed forming cavity, the top surface of the above-mentioned lower template is provided with a punching head extending into the punching hole corresponding to the punching hole and a tapping head rotatably installed to extend into the tapping hole corresponding to the tapping hole, the above-mentioned second upper die core is upwardly concave with a punching recess for the upper end of the punching head to extend into the inside corresponding to the punching head and a tapping recess for the upper end of the tapping head to extend into the inside corresponding to the tapping head, the areas of the above-mentioned second lower die core and the second upper die core corresponding to each stretching punch constitute the said stretching area, the area corresponding to the punching head constitutes the said hole forming area, and the area corresponding to the tapping hole constitutes the said tapping area.

5. The processing technology of the fire sprinkler head arm bracket according to claim 2 is characterized in that: The top front and rear sides of the above-mentioned lower template are fixed with a plurality of third support rods arranged at intervals in the left and right directions and extending upward from the third lower mold core, and each third support rod on the front side and each third support rod on the rear side respectively constitute a third support rod row, and the outer wall of the upper end portion of the third support rod is recessed with a closed annular groove, and the part of the above-mentioned third lower mold core located between the two third support rod rows is provided with a first punching hole and a second punching hole penetrating in the up and down directions, the first punching hole and the second punching hole constitute the punching hole, the first punching hole and the second punching hole are arranged at intervals in the left and right directions, and the first punching hole and the second punching hole are both strip holes extending in the front and back directions, and the central area of ​​the strip hole is provided with a partition strip extending in the left and right directions, and the left and right ends of the partition strip are convexly provided with convex arc strips extending in the up and down directions, and the convex arc surfaces of the two convex arc strips are arranged opposite to each other on the left and right sides, and the first The diameter of a punching hole in the left and right directions is smaller than the diameter of the second punching hole in the left and right directions. The first punching hole is located on the front side of the partition bar to form a first front punching hole, and is located on the rear side of the partition bar to form a first rear punching hole. The second punching hole is located on the front side of the partition bar to form a second front punching hole, and is located on the rear side of the partition bar to form a second rear punching hole. The bottom surface of the above-mentioned lower template is fixed with a first punching head that can tightly fit through the third lower die core corresponding to the first front punching hole and the first rear punching hole. The bottom surface of the above-mentioned lower template is fixed with a second punching head that can tightly fit through the third lower die core corresponding to the second front punching hole and the second rear punching hole. The above-mentioned third upper die core is located on the right side of the second punching hole and is provided with two strip-shaped cutting holes that are arranged front and back oppositely and extend in the left and right directions. The bottom surface of the above-mentioned lower template is located at the strip cutting hole and a punching head is installed. The two second punching holes fall between the two strip cutting holes.

6. The processing technology of the fire sprinkler head arm according to claim 2 is characterized in that: The above-mentioned third lower die core is located in the bending area and is provided with a strip-shaped bending hole extending in the left and right directions. The right end portion of the strip-shaped bending hole passes through the right side surface of the third lower die core. The inner bottom surface of the above-mentioned strip-shaped bending hole is convexly provided with a strip-shaped convex strip extending in the left and right directions. The strip-shaped convex strip has a left expanding section and a right shrinking section. The strip-shaped bending hole correspondingly has a left expanding hole and a right shrinking hole. The left expanding section is in the left expanding hole, the left end of the right shrinking section is in the left expanding hole, and the right end of the right shrinking section is in the right shrinking hole. A left lower bending block connected to the left expanding hole wall is convexly provided on the front and rear side walls of the left end portion of the above-mentioned left expanding section. The top surfaces of the two left lower bending blocks are downwardly inclined left lower inclined surfaces, and the two left lower inclined surfaces are a horn structure gradually expanding from top to bottom. The bottom surface of the above-mentioned lower template corresponds to the lower left bending block and is convexly provided with a device that can tightly fit The upper left bending block passes through the third upper die, and the bottom surfaces of the two upper left bending blocks are upwardly inclined upper left inclined surfaces, and the upper left inclined surfaces are arranged relative to the lower left inclined surfaces, and the two upper left inclined surfaces constitute a horn structure that gradually shrinks from bottom to top. The front and rear side walls of the left end portion of the above-mentioned right reduced diameter section are both convexly provided with a lower right bending block with a distance between it and the left expanded hole wall, and the side opposite to the top surface of the two lower right bending blocks is downwardly inclined lower right inclined surfaces, and the two lower right inclined surfaces are a horn structure that gradually expands from top to bottom. The bottom surface of the above-mentioned lower template corresponds to the lower right bending block and is downwardly convexly provided with an upper right bending block that can tightly fit through the third upper die, and the bottom surfaces of the two upper right bending blocks are upwardly inclined upper right inclined surfaces, and the upper right inclined surfaces are arranged relative to the lower right inclined surfaces, and the two upper right inclined surfaces constitute a horn structure that gradually shrinks from bottom to top.

7. The processing technology of the fire sprinkler head arm according to claim 6 is characterized in that: A shearing hole is provided downwardly on the top surface of the right end of the above-mentioned right reduced diameter section, which passes through in the up-down direction. The above-mentioned shearing hole is a strip cut hole extending in the front-to-back direction. The left hole wall and the right hole wall of the strip cut hole are convex arc walls, and the convex arc surfaces of the two convex arc walls are arranged opposite to each other on the left and right. The above-mentioned lower template is installed with a strip cutter corresponding to the strip cut hole, which is tightly fitted through the third lower die core and coincides with the strip cut hole. The above-mentioned strip cutter and the strip cut hole constitute the said shearing area.

8. The processing technology of the fire sprinkler head arm bracket according to claim 3 is characterized in that: A supporting protrusion is provided on the right side of the top surface of the first lower mold core, and the top surface of the supporting protrusion is flush with the top surface of the second lower mold core.

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