Multifunctional composite cold header

Abstract

The utility model discloses a multifunctional composite cold header. Comprising a bottom cover, a machine body fixedly connected to the bottom cover, a driving motor arranged on one side of the machine body, a transmission main shaft, a transmission auxiliary shaft, an eccentric shaft eccentrically and fixedly connected between the transmission main shaft and the transmission auxiliary shaft and a reciprocating cutting assembly arranged on one side of the machine body and used for cutting bars, the intermittent feeding assembly is arranged on the front face of the machine body and used for conveying the bars, and the intermittent punching die assembly is used for longitudinally punching the cut bars. According to the cold header, semi-hollow screws can be produced under the condition that standard screws are produced, double functions and practicability are achieved through one machine type, capital investment of client equipment is greatly reduced, noise during production is greatly reduced through the structure of the cold header, stability is better and precision is higher when products are discharged, and production efficiency is improved. And defective products are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to cold header technology field especially relates to a multifunctional composite cold header. BACKGROUND

[0002] Cold header is a kind of high-efficiency metal forming equipment specially used for batch production of fasteners such as nuts and bolts. It applies pressure to metal blank at room temperature through cold heading process, so that plastic deformation occurs in the die, thereby obtaining the required shape and size. Cold header originated in Germany, and was initially used for large-scale manufacturing of bullet shells during World War II. Modern cold header has developed into multi-station and multi-series models, with high efficiency and automation, and can realize continuous production, with high strength, good surface quality and high dimensional accuracy. It is widely used in automobile parts, building materials, hardware parts and other fields.

[0003] When the cold header cold headers the bar stock, the cold heading time, i.e. the time for the die to extrude the bar stock, should be as long as possible to ensure that the dimensions of the parts produced in the same batch are relatively uniform. The front ejection device of the cold header disclosed in the application file with publication number CN 215697700U has a common cold header transmission device. The transmission device includes an input motor, a crankshaft and a push rod linkage connected to the crankshaft. The crankshaft drives the push rod linkage to move the slide seat left and right, so that the die installed on the slide seat punches the cut-off bar stock, forming the bar stock into the required shape. However, when the bar stock is cold headed by the transmission unit, the slide stays at the position close to the bar stock for a short time, and the bar stock is extruded for a short time. The dimensions of the parts such as bolts or nuts produced in the same batch may differ, and the quality of the parts in the same batch is difficult to control.

[0004] The current cold header is used to improve the quality difference of the bar in the cold heading process. For example, a cold header with application number CN202310642222.2, the technical key points are: a bed body; a feeding unit installed on the bed body for conveying the bar; a cutting unit installed on the bed body for cutting the bar conveyed by the feeding unit into the bed body, a main slide table and a main die box arranged opposite to each other, the main slide table being slidingly connected to the bed body, the main die box being fixedly connected to the bed body, a transmission unit including: a main crankshaft being rotatably connected to the bed body and being in transmission connection with a motor outside; a first connecting rod having one end rotatably connected to an eccentric part of the main crankshaft; a first connecting shaft being fixedly connected to the bed body; a second connecting rod being arranged above the first connecting rod, one end of the second connecting rod being rotatably connected to the first connecting shaft; a second connecting shaft, the other end of the first connecting rod being rotatably connected to the second connecting shaft, the other end of the second connecting rod being rotatably connected to the second connecting shaft; and a pushing rod, one end of the pushing rod being rotatably connected to the second connecting shaft, the other end of the pushing rod being rotatably connected to the main slide table, the pushing rod being used to push the main slide table to slide relative to the bed body, the main slide table being used to cold heading the bar by approaching the main die box; a clamping unit installed on the bed body for clamping the bar to different stations.

[0005] The technical scheme mainly uses a motor as a power source to complete the cold heading action of the bar. However, in actual application, if the motor provides insufficient force under the resistance of the bar strength, the bar may not be completely cut every time, resulting in a large number of defective semi-finished products when leaving the cold header.

[0006] Therefore, a multifunctional composite cold header is proposed to solve or alleviate the above problems. Invention content

[0007] The purpose of the present application is to solve the problems in the prior art and provide a multifunctional composite cold header.

[0008] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0009] The utility model provides a multifunctional composite cold header, including bottom cover, fixedly connected on the bottom cover machine body, the drive motor of setting in the one side of machine body, coaxial and rotationally connected on the frame transmission main shaft and transmission auxiliary shaft, eccentric fixedly connected between transmission main shaft and transmission auxiliary shaft eccentric shaft, set up in the one side of machine body and be used for cutting bar reciprocating cutting assembly, set up in the front of machine body and be used for transporting bar intermittent feeding assembly and be used for longitudinal stamping cutting bar intermittent die assembly after cutting, and set up in the machine body and be used for pushing the top material assembly of falling bar and be used for compressed air compression assembly, the output shaft of drive motor is fixedly connected with driving wheel, transmission main shaft is fixedly connected with transmission wheel, driving wheel and transmission wheel pass through transmission belt transmission connection, transmission auxiliary shaft is fixedly connected with balance wheel, transmission main shaft passes through first transmission assembly and reciprocating cutting assembly transmission connection, transmission main shaft passes through second transmission assembly and intermittent feeding assembly transmission connection, intermittent feeding assembly and intermittent die assembly transmission connection, eccentric shaft and compression assembly transmission connection, compression assembly and reciprocating cutting assembly, the compression assembly and top material assembly all are through the intercommunication setting of connecting pipeline, and the connecting pipeline can be on-off setting.

[0010] Preferably, the reciprocating cutting assembly includes a slide seat in the shape of C and fixedly connected to one side of the machine body, a slide plate slidingly connected in the slide seat, a side arm fixedly connected to one side of the slide seat through a guide rod, a crossbar fixedly connected to the top of the side arm and located above the machine body, a cutter fixedly connected to the end of the crossbar away from the side arm, a top shaft slidingly connected outside the guide rod and penetrating through the machine body to the inside thereof, an eccentric shaft fixedly connected to the end of the top shaft away from the guide rod and located in the cutter seat, a moving through slot opened on the top surface of the slide seat and having the same length direction as the guide rod, a guide link slidingly connected in the moving through slot and outside the guide rod, and a guide column fixedly connected to the bottom surface of the guide link and in the shape of a cylinder, the top shaft penetrating into the slide seat and the top shaft and the guide link being fixedly connected, the top surface of the slide plate being provided with a staggered slot in the shape of Z, the guide column slidingly connected in the staggered slot, and the end of the slide seat away from the slide plate being fixedly connected with a limiting cover which can be sleeved outside the slide plate.

[0011] Preferably, the first transmission assembly includes a driving gear fixedly connected outside the transmission main shaft, a first gear shaft penetrating through the machine body, a driven gear fixedly connected to the end of the first gear shaft and meshingly connected with the driving gear, an upper slide block eccentrically rotatably connected to the end surface of the driven gear, a sliding frame slidingly connected outside the upper slide block, and a pressurized cylinder fixedly connected with the sliding frame, the movable end of the pressurized cylinder being fixedly connected with a rotating rod, the end of the rotating rod away from the pressurized cylinder being rotatably connected with the slide plate.

[0012] Preferably, the front of the machine body is fixedly connected with a mounting seat, the intermittent feeding assembly comprises a guide block rotatably arranged on the mounting seat, an arc-shaped arm, a main guide gear rotatably arranged on the mounting seat, a driving gear fixedly connected coaxially with the main guide gear, a rotating seat coaxially arranged with the driving gear and opposite to the driving gear and in a strip shape, a hook rotatably connected with one end of the rotating seat, and a slave guide gear rotatably connected with the mounting seat and in meshing connection with the main guide gear, a sliding slot in a strip shape is arranged on the guide block, the lower end of the arc-shaped arm is fixedly connected with a round sliding column slidably arranged in the sliding slot, the upper end of the arc-shaped arm is rotatably connected with the end of the rotating seat away from the hook, the hook is in meshing arrangement with the teeth of the driving gear, the side of the mounting seat away from the main guide gear is provided with a movable wheel, the main guide gear is coaxially and in transmission connection with the movable wheel, the slave guide gear is coaxially and in transmission connection with a directional wheel arranged below the movable wheel, the movable wheel and the directional wheel are in a channel through which the bar can pass, and the sidewall of the mounting seat is fixedly connected with a wheel cover arranged above the movable wheel.

[0013] Preferably, the front of the machine body is fixedly connected with a mounting seat, the intermittent feeding assembly comprises a guide block rotatably arranged on the mounting seat, an arc-shaped arm, a main guide gear rotatably arranged on the mounting seat, a driving gear fixedly connected coaxially with the main guide gear, a rotating seat coaxially arranged with the driving gear and opposite to the driving gear and in a strip shape, a hook rotatably connected with one end of the rotating seat, and a slave guide gear rotatably connected with the mounting seat and in meshing connection with the main guide gear, a sliding slot in a strip shape is arranged on the guide block, the lower end of the arc-shaped arm is fixedly connected with a round sliding column slidably arranged in the sliding slot, the upper end of the arc-shaped arm is rotatably connected with the end of the rotating seat away from the hook, the hook is in meshing arrangement with the teeth of the driving gear, the side of the mounting seat away from the main guide gear is provided with a movable wheel, the main guide gear is coaxially and in transmission connection with the movable wheel, the slave guide gear is coaxially and in transmission connection with a directional wheel arranged below the movable wheel, the movable wheel and the directional wheel are in a channel through which the bar can pass, and the sidewall of the mounting seat is fixedly connected with a wheel cover arranged above the movable wheel.

[0014] Preferably, the top feeding assembly comprises an inclined and hollow shaft support, a lower sliding block slidably arranged in the shaft support, an elastic air cylinder fixedly connected in the lower end of the shaft support, a connecting rod fixedly connected with the movable end of the elastic air cylinder and the lower sliding block, and a transmission swing arm rotatably connected with the lower sliding block through a rotating shaft, the upper end of the shaft support is fixedly connected with one side of the machine body, the side of the machine body away from the shaft support is fixedly connected with two vertically arranged reset springs, the end portions of the two reset springs are fixedly connected with a connecting seat, the connecting seat and the swing arm are rotatably connected with a hinged arm, the two hinged arms are fixedly connected with a horizontal shaft, a fixed seat is fixedly connected in the machine body, two vertically arranged push plates are slidably arranged in the fixed seat, and the two hinged arms are rotatably connected with the two push plates respectively.

[0015] Preferably, the compression assembly comprises an eccentric rocker connected to the eccentric shaft, a piston connected to the eccentric rocker, a main connecting cylinder, an auxiliary connecting pipe connected to the main connecting cylinder, an air outlet pipe connected to the main connecting cylinder, a pressure sensor fixed to the top surface of the machine body, and a vertical rod, the machine body is provided with a horizontal cylinder body, a vertical cylinder body connected to the horizontal cylinder body, and a support cylinder body below the pressure sensor, the machine body is provided with a one-way valve connected to the horizontal cylinder body, the vertical rod is slidably connected to the support cylinder body, the upper end of the vertical rod is in contact with the probe of the pressure sensor, the auxiliary connecting pipe is connected to the lower end of the straight cylinder body, the main connecting cylinder is connected to the lower end of the vertical cylinder body, and the air outlet pipe is connected to the reciprocating cutting assembly and the material lifting assembly through a connecting pipeline.

[0016] Preferably, the connecting pipeline comprises a horizontal air valve arranged on the back surface of the machine body, a first side air valve and a second side air valve arranged on the two sides of the machine body, the air outlet pipe is connected to the horizontal air valve through a first connecting air pipe, the horizontal air valve is connected to the first side air valve and the second side air valve through a plurality of second connecting air pipes, a plurality of lower air holes are arranged on the side wall of the bottom cover and connected to the inside of the bottom cover, an upper air hole is arranged on the side wall of the machine body and connected to the inside of the machine body, a gas seat is fixedly arranged in the machine body above the material lifting assembly, a gas injection groove is arranged on the gas seat and faces the front surface of the machine body, the first side air valve is connected to the gas seat through a third connecting air pipe penetrating the upper air hole, the first side air valve is connected to a plurality of lower air holes through a plurality of fourth connecting air pipes, the second side air valve is connected to the elastic cylinder through a fifth connecting air pipe, and the second side air valve is connected to the pressurizing cylinder through a sixth connecting air pipe, the horizontal air valve, the first side air valve, and the second side air valve are electrically controlled valves, the pressure sensor is coupled with a controller, and the controller is coupled with the horizontal air valve, the first side air valve, and the second side air valve.

[0017] Preferably, the second transmission assembly comprises a first bevel gear fixedly connected to a first gear shaft away from a driven gear, a second bevel gear meshingly connected to the first bevel gear, a third bevel gear coaxially fixedly connected to the second bevel gear through a second gear shaft, a fourth bevel gear meshingly connected to the third bevel gear, a third gear shaft penetrating the connecting table, and a fourth gear shaft penetrating the mounting seat and coaxially connected to the third gear shaft, one side of the machine body is fixedly connected with a rotating seat, the second gear shaft is rotatably connected in the rotating seat, the cam is fixedly connected to the third gear shaft, the first end face tooth and the second end face tooth are coaxially fixedly connected to the ends of the third gear shaft and the fourth gear shaft, respectively, the first end face tooth and the second end face tooth are meshingly connected, and the fourth gear shaft is fixedly connected with the guide block.

[0018] Preferably, the bottom cover is fixedly connected with an inclined guide plate, the front and back of the bottom cover are both provided with an open slot, and the bottom cover is fixedly connected with an inclined material collecting hopper at the open slot on the front, and a chip removal groove is formed in the thickness direction of the guide plate and the thickness direction of the material collecting hopper.

[0019] The utility model has the following beneficial effects:

[0020] In the utility model, the transmission main shaft and the transmission auxiliary shaft drive the eccentric shaft to rotate, the eccentric rocker arm makes the piston reciprocate in the cylinder body, air enters the cylinder body through the check valve and is compressed, the vertical rod is lifted in the branch cylinder body and abuts against the pressure sensor, when the pressure reaches the standard, the controller opens the air valve to exhaust. In this way, the cold header can produce qualified semi-finished rod materials, avoids incomplete cutting, and can produce half hollow screws under the condition of producing standard screws, one model realizes double functions, greatly reduces the customer equipment investment, and the machine structure greatly reduces the noise during production, improves the stability of product discharge, and has higher precision, and greatly reduces the generation of defective products. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can be obtained without creative labor according to these drawings.

[0022] Figure 1 It is the structural schematic diagram of the utility model;

[0023] Figure 2 It is the structural schematic diagram of the utility model after removing the underframe and the outer cover Figure 1 ;

[0024] Figure 3 It is the enlarged view of A in the utility model; Figure 2

[0025] Figure 4 It is the structural schematic diagram of the utility model after removing the underframe and the outer cover Figure 2 ;

[0026] Figure 5 It is the enlarged view of B in the utility model; Figure 4

[0027] Figure 6 It is the structural schematic diagram of the utility model after removing the underframe and the outer cover Figure 3 ;

[0028] Figure 7 It is the structural schematic diagram of the utility model after removing the underframe and the outer cover Figure 6 ​​Enlarged view of the middle C;

[0029] Figure 8 Structure diagram of the utility model after removing the chassis and the outer cover Figure 4 ;

[0030] Figure 9 Structure diagram of the utility model after removing the chassis and the outer cover Figure 5 ;

[0031] Figure 10 For Figure 9 Enlarged view of the middle D;

[0032] Figure 11 Structure diagram of the utility model after removing the chassis and the outer cover Figure 6 ;

[0033] Figure 12 Sectional view of the utility model after removing the chassis and the outer cover;

[0034] Figure 13 For Figure 12 Enlarged view of the middle E;

[0035] Figure 14 For Figure 12 Enlarged view of the middle F;

[0036] Figure 15 Structure diagram of the reciprocating cutting assembly in the utility model.

[0037] 1, chassis; 2, cover; 3, bottom cover; 4, horizontal seat; 5, vertical guide roller; 6, vertical seat; 7, horizontal guide roller; 8, connecting table; 9, machine body; 10, mounting seat; 11, wheel cover; 12, movable wheel; 13, directional wheel; 14, driving motor; 15, transmission belt; 16, transmission wheel; 17, transmission main shaft; 18, driving gear; 19, eccentric shaft; 20, transmission auxiliary shaft; 21, balancing wheel; 22, driven gear; 23, upper sliding block; 24, sliding frame; 25, pressurizing cylinder; 26, rotating rod; 27, sliding plate; 28, staggered slot; 29, sliding seat; 30, guide rod; 31, side arm; 32, horizontal rod; 33, cutter; 34, guide connecting block; 35, guide column; 36, top shaft; 37, cutter seat; 38, limiting cover; 39, shaft support; 40, elastic cylinder; 41, connecting rod; 42, lower sliding block; 43, rotating shaft; 44, transmission rocker arm; 45, horizontal shaft; 46, hinged arm; 47, fixed seat; 48, push plate; 49, return spring; 50, connecting seat; 51, first gear shaft; 52, first bevel gear; 53, second bevel gear; 54, second gear shaft; 55, third bevel gear; 56, fourth bevel gear; 57, third gear shaft; 58, cam; 59, first end face tooth; 60, second end face tooth; 61, striker; 62, swing arm; 63, connecting shaft; 64, containing slot; 65, receiving wheel; 66, connecting spring; 67, jacking rod; 68, jacking seat; 69, fourth gear shaft; 70, guide block; 71, arc-shaped arm; 72, hook; 73, driving gear; 74, main guide gear; 75, slave guide gear; 76, eccentric rocker arm; 77, piston; 78, horizontal cylinder body; 79, vertical cylinder body; 80, support cylinder body; 81, vertical rod; 82, pressure sensor; 83, main connecting cylinder; 84, auxiliary connecting pipe; 85, air outlet pipe; 86, air seat; 87, air injection slot; 88, upper air hole; 89, first side air valve; 90, lower air hole; 91, second side air valve; 92, horizontal air valve; 93, guide plate; 94, material collecting hopper; 95, chip removal slot. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents the preferred application of the application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0040] It should be noted that similar reference numbers and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, the terms "first", "second", "third", and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] A multifunctional composite cold header, such as Figures 1-15As shown, it comprises a base frame 1, a bottom cover 3 fixedly connected to the base frame 1, a machine body 9 fixedly connected to the bottom cover 3, an outer cover 2 fixedly connected to the base frame 1 and sleeved outside the machine body 9, a driving motor 14 arranged on one side of the machine body 9, a transmission main shaft 17 and a transmission auxiliary shaft 20 coaxially and rotationally connected to the rack, an eccentric shaft 19 eccentrically fixedly connected between the transmission main shaft 17 and the transmission auxiliary shaft 20, a reciprocating cutting assembly arranged on one side of the machine body 9 and used for cutting bars, an intermittent feeding assembly arranged on the front of the machine body 9 and used for transporting bars, an intermittent die assembly used for longitudinally stamping and cutting bars, a top feeding assembly arranged in the machine body 9 and used for pushing fallen bars, and a compression assembly used for compressed air, the output shaft of the driving motor 14 is fixedly connected with a driving wheel, the transmission main shaft 17 is fixedly connected with a transmission wheel 16, the driving wheel and the transmission wheel 16 are drivingly connected through a transmission belt 15, the transmission auxiliary shaft 20 is fixedly connected with a balancing wheel 21, the transmission main shaft 17 is drivingly connected with the reciprocating cutting assembly through a first transmission assembly, the transmission main shaft 17 is drivingly connected with the intermittent feeding assembly through a second transmission assembly, the intermittent feeding assembly is drivingly connected with the intermittent die assembly, the eccentric shaft 19 is drivingly connected with the compression assembly, the compression assembly and the reciprocating cutting assembly, and the compression assembly and the top feeding assembly are both communicatively arranged through a connecting pipeline, and the connecting pipeline can be set to be on or off.

[0045] As shown in Figure 8 , Figure 10 , Figure 15 As shown, the reciprocating cutting assembly comprises a sliding seat 29 in C-shaped cross section fixedly connected to one side of the machine body 9, a sliding plate 27 slidingly connected in the sliding seat 29, a side arm 31 fixedly connected to one side of the sliding seat 29 through a guide rod 30, a cross bar 32 fixedly connected to the top of the side arm 31 and located above the machine body 9, a cutter 33 fixedly connected to the end of the cross bar 32 away from the side arm 31, a top shaft 36 slidingly connected outside the guide rod 30 and penetrating through the machine body 9 to the inside thereof, a guide connecting block 34 fixedly connected to the end of the top shaft 36 away from the guide rod 30 and located in a cutter seat 37, a moving through slot opened on the top surface of the sliding seat 29 and having the same length direction as the guide rod 30, the guide connecting block 34 slidingly connected in the moving through slot and outside the guide rod 30, and a guide column 35 fixedly connected to the bottom surface of the guide connecting block 34 and in cylindrical shape, the top shaft 36 penetrates into the sliding seat 29 and is fixedly connected with the guide connecting block 34, the top surface of the sliding plate 27 is provided with a staggered slot 28 in Z-shaped, the guide column 35 is slidingly connected in the staggered slot 28, and the end of the sliding seat 29 away from the sliding plate 27 is fixedly connected with a limiting cover 38 which can be sleeved outside the sliding plate 27.

[0046] The first transmission assembly comprises a driving gear 18 fixedly connected to the outside of the transmission main shaft 17, a first gear shaft 51 penetrating through the machine body 9, a driven gear 22 fixedly connected to the end of the first gear shaft 51 and in meshing connection with the driving gear 18, an upper sliding block 23 eccentrically rotatably connected to the end face of the driven gear 22, a sliding frame 24 slidingly connected to the outside of the upper sliding block 23, and a pressurizing cylinder 25 fixedly connected with the sliding frame 24. The movable end of the pressurizing cylinder 25 is fixedly connected with a rotating rod 26, and the end of the rotating rod 26 away from the pressurizing cylinder 25 is rotatably connected with a sliding plate 27.

[0047] As shown in Figure 3 , Figure 7 and Figure 13 , the front face of the machine body 9 is fixedly connected with a mounting seat 10. The intermittent feeding assembly comprises a guide block 70 rotatably arranged on the mounting seat 10, an arc-shaped arm 71, a main guide gear 74 rotatably arranged on the mounting seat 10, a driving gear 73 fixedly connected coaxially with the main guide gear 74, a rotating seat coaxially arranged with the driving gear 73 and rotatable relative to the driving gear 73 and in a strip shape, a hook 72 rotatably connected to one end of the rotating seat, and a driven guide gear 75 rotatably connected to the mounting seat 10 and in meshing connection with the main guide gear 74. A sliding slot in a strip shape is formed in the guide block 70. The lower end of the arc-shaped arm 71 is fixedly connected with a round sliding column slidingly connected in the sliding slot. The upper end of the arc-shaped arm 71 is rotatably connected with the end of the rotating seat away from the hook 72. The hook 72 is in meshing connection with the teeth of the driving gear 73. The side of the mounting seat 10 away from the main guide gear 74 is provided with a movable wheel 12. The main guide gear 74 is coaxially and in transmission connection with the movable wheel 12. The driven guide gear 75 is coaxially and in transmission connection with a directional wheel 13 located below the movable wheel 12. There is a channel between the movable wheel 12 and the directional wheel 13 for the passage of the bar. The sidewall of the mounting seat 10 is fixedly connected with a wheel cover 11 located above the movable wheel 12.

[0048] As shown in Figure 5 and Figure 13 , the front face of the machine body 9 is fixedly connected with a connecting table 8 located on one side of the mounting seat 10. The intermittent die assembly comprises a top rod 67 longitudinally penetrating through the machine body 9 to the inside thereof, a striker 61 longitudinally penetrating through the connecting table 8 and coaxially arranged with the top rod 67, a connecting shaft 63 rotatably connected between the connecting table 8 and the mounting seat 10, a swing arm 62 rotatably connected to the outside of the connecting shaft 63, and a cam 58 fixedly connected with the lower end of the swing arm 62 and in intermittent coaxial transmission connection with the guide block 70 and the connecting spring 66 on the front face of the machine body 9. The machine body 9 is provided with a top seat 68 for the penetration of the top rod 67. The swing arm 62 is provided with a containing groove 64 located between the connecting spring 66 and the connecting shaft 63. A receiving wheel 65 is rotatably connected in the containing groove 64. The outer ring of the receiving wheel 65 is in abutting connection with the outer ring of the cam 58. The bottom face of the connecting table 8 is provided with a vertical groove. The bottom face of the striker 61 is provided with a recess. The upper end of the swing arm 62 extends into the recess.

[0049] As shown in Figure 2 , Figure 6 , Figure 7 , the top material assembly comprises an inclined and hollow shaft bracket 39, a lower sliding block 42 slidingly connected in the shaft bracket 39, an elastic air cylinder 40 fixedly connected in the lower end of the shaft bracket 39, a connecting rod 41 fixedly connected between the movable end of the elastic air cylinder 40 and the lower sliding block 42, and a transmission rocker arm 44 rotationally connected with the lower sliding block 42 through a rotating shaft 43, the upper end of the shaft bracket 39 is fixedly connected to one side of the machine body 9, two groups of return springs 49 are fixedly connected to the side of the machine body away from the shaft bracket 39, the end portions of the two groups of return springs 49 are fixedly connected to a connecting seat 50, the connecting seat 50 and the swing arm 62 are both rotationally connected to a hinged arm 46, a horizontal shaft 45 is fixedly connected between the two hinged arms 46, a fixed seat 47 is fixedly connected in the machine body 9, two push plates 48 are slidingly connected in the fixed seat 47, and the two hinged arms 46 are rotationally connected to the two push plates 48 respectively.

[0050] As shown in Figure 11 , Figure 12 , Figure 14 , the compression assembly comprises an eccentric rocker arm 76 rotationally connected to the outside of the eccentric shaft 19, a piston 77 rotationally connected to the end of the eccentric rocker arm 76 away from the eccentric shaft 19, a main connecting cylinder 83, an auxiliary connecting pipe 84 in communication with the main connecting cylinder 83, a gas outlet pipe 85 in communication with the main connecting cylinder 83, a pressure sensor 82 fixedly connected to the top surface of the machine body 9, and a vertical rod 81, the machine body 9 is provided with a horizontal cylinder body 78, a vertical cylinder body 79 in communication with the horizontal cylinder body 78, and a support cylinder body 80 below the pressure sensor 82, the machine body 9 is fixedly connected with a one-way valve in communication with the horizontal cylinder body 78, the vertical rod 81 is slidingly connected in the support cylinder body 80, and the upper end of the vertical rod 81 is in contact with the probe of the pressure sensor 82, the auxiliary connecting pipe 84 is in communication with the lower end of the horizontal cylinder body, the main connecting cylinder 83 is in communication with the lower end of the vertical cylinder body 79, and the gas outlet pipe 85 is in communication with the reciprocating cutting assembly and the top material assembly through a connecting pipeline.

[0051] As shown in Figure 2 , Figure 4 , Figures 7-11As shown, the connecting pipeline includes a transverse air valve 92 arranged on the back of the body 9, and a first side air valve 89 and a second side air valve 91 arranged on both sides of the body 9, the air outlet pipe 85 communicates with the transverse air valve 92 through a first connecting air pipe, the transverse air valve 92 communicates with the first side air valve 89 and the second side air valve 91 through a plurality of second connecting air pipes respectively, a plurality of lower air holes 90 are arranged on the side wall of the bottom cover 3 and communicate with the inside thereof, an upper air hole 88 is arranged on the side wall of the body 9 and communicates with the inside thereof, a gas seat 86 is fixedly connected in the body 9 and located above the top material assembly, a gas injection groove 87 is arranged on the gas seat 86 and faces the front of the body 9, the first side air valve 89 communicates with the gas seat 86 through a third connecting air pipe penetrating the upper air hole 88, the first side air valve 89 is arranged in communication with a plurality of lower air holes 90 through a plurality of fourth connecting air pipes, the second side air valve 91 communicates with the elastic air cylinder 40 through a fifth connecting air pipe, and the second side air valve 91 is arranged in communication with the pressurizing air cylinder 25 through a sixth connecting air pipe. The transverse air valve 92, the first side air valve 89, and the second side air valve 91 are all electrically controlled valves, the pressure sensor 82 is coupled with a controller, and the controller is coupled with the transverse air valve 92, the first side air valve 89, and the second side air valve 91.

[0052] As shown in Figure 2 , Figure 4 , Figure 6 , Figure 8 , Figure 9 , Figure 11 and Figure 13 As shown, the second transmission assembly includes a first bevel gear 52 fixedly connected with the first gear shaft 51 away from one end of the driven gear 22, a second bevel gear 53 meshingly connected with the first bevel gear 52, a third bevel gear 55 coaxially fixedly connected with the second bevel gear 53 through a second gear shaft 54, a fourth bevel gear 56 meshingly connected with the third bevel gear 55, a third gear shaft 57 penetrating the connecting table 8, and a fourth gear shaft 69 penetrating the mounting seat 10 and coaxially connected with the third gear shaft 57, one side of the body 9 is fixedly connected with a rotating seat, the second gear shaft 54 is rotatably connected in the rotating seat, the cam 58 is fixedly connected on the third gear shaft 57, the third gear shaft 57 and the fourth gear shaft 69 are respectively coaxially fixedly connected with a first end face tooth 59 and a second end face tooth 60 at one end of each other, the tooth profile section of the first end face tooth 59 and the second end face tooth 60 is a right triangle, the first end face tooth 59 and the second end face tooth 60 are meshingly connectable, the fourth gear shaft 69 is fixedly connected with the guide block 70, the fourth gear shaft 69 is sleeved with a torsional spring on the outside, one end of the torsional spring is fixedly connected with the body 9, and the other end of the torsional spring is fixedly connected with the guide block 70, so that the guide block 70 can rotate.

[0053] The bottom cover 3 is fixedly connected with an inclined guide plate 93, and the front and back surfaces of the bottom cover 3 are provided with open grooves; the bottom cover 3 is fixedly connected with an inclined material collecting hopper 94 at the open groove on the front surface; the thickness direction of the guide plate 93 and the thickness direction of the material collecting hopper 94 are both provided with chip removal grooves 95; a vertical seat 6 is fixedly connected to the side of the mounting seat 10 away from the machine body 9; a plurality of horizontal guide rollers 7 are rotatably connected to the side surface of the vertical seat 6; a horizontal seat 4 is fixedly connected to the side of the vertical seat 6 away from the mounting seat 10; and a plurality of vertical guide rollers 5 are rotatably connected to the horizontal seat 4.

[0054] When the utility model is actually working, the rod is straightened by the vertical guide rollers and the horizontal guide rollers 7 under the guidance of the operating personnel, and then enters between the movable wheel 12 and the directional wheel 13; in this process, the driving motor 14 serves as a power source to drive the driving wheel on the output shaft and the transmission belt 15 to drive the transmission wheel 16 to rotate; the transmission wheel 16 drives the driving gear 18 and the transmission main shaft 17 to rotate when rotating; the transmission main shaft 17 drives the eccentric wheel and the transmission auxiliary shaft 20 to rotate; the transmission auxiliary shaft 20 drives the balance wheel 21 to rotate when rotating; in this way, the transmission main shaft 17 and the transmission auxiliary shaft 20 on both sides of the rack can keep a relatively balanced state, so that the transmission wheel 16 is not prone to shaking when rotating.

[0055] The driving gear 18 also drives the driven gear 22 to rotate when rotating; the driven gear 22 drives the first gear shaft 51 to drive the first bevel gear 52 to rotate; the first bevel gear 52 drives the second bevel gear 53 meshing therewith to rotate; the second bevel gear 53 drives the third bevel gear 55 to drive the fourth bevel gear 56 to rotate through the driving of the second gear shaft 54; the fourth bevel gear 56 drives the third gear shaft 57 to rotate when rotating; the third gear shaft 57 drives the fourth gear shaft 69 to rotate intermittently through the first end face tooth 59 and the second end face tooth 60; the fourth gear shaft 69 drives the guide block 70 to rotate when rotating; in this way, the arc-shaped arm 71 can drive the rotating seat to rotate clockwise; the hook claw 72 drives the gear 73 to deflect by a certain angle when the rotating seat rotates clockwise; in this way, the main guide gear 74 also deflects by the same angle; the driven guide gear 75 meshing with the main guide gear 74 rotates counterclockwise, so that the movable wheel 12 and the directional wheel 13 on the mounting frame can drive the rod to move intermittently.

[0056] Subsequently the bar enters into the machine body 9, under the rotation of the driven gear 22, the eccentrically rotating upper slide block 23 rotating on it will also rotate and slide in the slide frame 24, forming a crank connecting rod 41 structure, thus enabling the pressurized cylinder 25 and the rotating rod 26 to push the slide plate 27 to slide in the slide base 29, while due to the shape of the staggered slot 28 on the slide plate 27, the guide column 35 can drive the guide connecting block 34 to reciprocate, and the guide connecting block 34 is guided by the guide rod 30 during displacement, with good stability, so that the cutter 33 will not displace, but the cutter holder 37 will displace with the top shaft 36 and the guide connecting block 34, so that the cutter holder 37 cooperates with the cutter 33 to complete the cutting of the bar, at this time the bar will be pushed by the cutter holder 37 in advance, so that the cut bar is staggered with the subsequent bar to be processed, at this time the cut bar is located on the end face of the top base 68;

[0057] At the same time, due to the rotation of the third gear shaft 57, the cam 58 can extrude the bearing wheel 65 on the swing arm 62, so that the swing arm 62 can swing through the connecting shaft 63 once, and then the upper end of the swing arm 62 can drive the striker 61, so that the striker 61 strikes on the jacking rod 67, so that the jacking rod 67 penetrates the machine body 9 and the top base 68, extruding the cut bar, and can be inserted into the bar, so that the shape is corrected, becoming the initial shape of the half hollow screw;

[0058] During the whole process, the transmission main shaft 17 and the transmission auxiliary shaft 20 drive the eccentric shaft 19 to rotate, the eccentric shaft 19 drives the piston 77 to reciprocate in the horizontal cylinder body 78 through the eccentric rocker arm 76, air enters the horizontal cylinder body 78, the vertical cylinder body 79 and the branch cylinder body 80 through the one-way valve, and the air is compressed with the continuous operation of the piston 77, so that the vertical rod 81 is lifted upward in the branch cylinder body 80 and abuts against the pressure sensor 82, so that the pressure sensor 82 detects that the pressure increases, when the pressure reaches a certain value, the controller controls the horizontal air valve 92, the first side air valve 89 and the second side air valve 91 to be partially opened or fully opened, so as to exhaust, so that the compressed air can be utilized, wherein the compressed air enters the pressurized air cylinder 25, the pressurized air cylinder 25 can instantaneously increase the force applied by the reciprocating cutting assembly to the bar, so that the bar can be cleanly and neatly cut off, thereby ensuring the quality of the semi-finished product, in addition, the compressed air also enters the elastic air cylinder 40 to drive the lower sliding block 42 to displace in the shaft support 39, so that the rotating shaft 43 on the lower sliding block 42 drives the transmission rocker arm 44 to deflect, and then the transmission rocker arm 44 can pull the articulated arm 46 to deflect, so that the push plate 48 connected with the articulated arm 46 can displace in the fixed seat 47, so that the push plate 48 can push the falling bar forward, so that the bar can fall into the material collecting hopper 94 for recycling, in addition, the pressurized air can also be sprayed through the air jet groove 87 on the air seat 86, and can also be sprayed through the lower air hole 90, so that the debris can be separated from the bar through the chip removal groove 95, and the bar cutting part is as clean as possible, avoiding the situation that the debris is jammed;

[0059] Therefore, the cold header can produce bar with qualified semi-finished product quality, and the cutting is complete.

[0060] The above only describes preferred embodiments of the present application and is not used to limit the present application, and for those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-functional combined cold header, characterized by, The utility model relates to a rod cutting machine, including bottom cover (3), fixedly connected on bottom cover (3) machine body (9), set up in the one side of machine body (9) driving motor (14), coaxial and rotationally connected on the frame transmission main shaft (17) and transmission auxiliary shaft (20), eccentric fixedly connected between transmission main shaft (17) and transmission auxiliary shaft (20) eccentric shaft (19), set up in the one side of machine body (9) and be used for cutting the reciprocating cutting assembly of bar material, set up in the front of machine body (9) and be used for the intermittent feeding assembly of bar material of transport and the intermittent die assembly for longitudinal stamping cutting after bar material, and set up in machine body (9) and be used for the top material assembly of bar material of pushing and the compression assembly for compressed air, the output shaft of driving motor (14) is fixedly connected with driving wheel, transmission main shaft (17) is fixedly connected with transmission wheel (16), and driving wheel and transmission wheel (16) are driven connection through transmission belt (15), transmission auxiliary shaft (20) is fixedly connected with balance wheel (21), transmission main shaft (17) is driven connection with reciprocating cutting assembly through first transmission assembly, transmission main shaft (17) is driven connection with intermittent feeding assembly through second transmission assembly, intermittent feeding assembly and intermittent die assembly are driven connection, eccentric shaft (19) and compression assembly are driven connection, and the compression assembly and reciprocating cutting assembly, the compression assembly and top material assembly are all through the intercommunication setting of connecting pipeline, and the connecting pipeline can be on-off setting.

2. A multi-functional combined cold header as claimed in claim 1, wherein, The reciprocating cutting assembly includes the slide (29) of the section C-shaped and fixedly connected in the one side of machine body (9), the slide plate (27) of sliding connection in the slide (29), the side arm (31) of fixedly connected in the one side of slide (29) through guide rod (30), the cross bar (32) of fixedly connected in the top of side arm (31) and located above machine body (9), the cutter (33) of fixedly connected in the one end of cross bar (32) away from side arm (31), the top shaft (36) of sliding connection in the outside of guide rod (30) and through machine body (9) to its inside, the cutter seat (37) of fixedly connected in the one end of top shaft (36) away from guide rod (30), the moving through slot of being set up on the top surface of slide (29) and the length direction same with guide rod (30), the guide link (34) of sliding connection in the moving through slot and the outside of guide rod (30), and the guide column (35) of fixedly connected in the bottom surface of guide link (34) and the cylinder shape, the top shaft (36) is through to the inside of slide (29) and the top shaft (36) is fixedly connected with guide link (34), the top surface of slide plate (27) is set up with the staggered groove (28) of Z-shaped, the guide column (35) is slidingly connected in the staggered groove (28), and the one end of slide (29) away from slide plate (27) is fixedly connected with the limit cover (38) of the sleeve set in the outside of slide plate (27).

3. A multi-functional combined cold header as claimed in claim 2, wherein, The first transmission assembly comprises a driving gear (18) fixedly connected to the outside of the transmission main shaft (17), a first gear shaft (51) penetrating through the machine body (9), a driven gear (22) fixedly connected to the end of the first gear shaft (51) and in meshing connection with the driving gear (18), an upper sliding block (23) eccentrically rotatably connected to the end face of the driven gear (22), a sliding frame (24) slidingly connected to the outside of the upper sliding block (23), and a pressurized cylinder (25) fixedly connected with the sliding frame (24), wherein the movable end of the pressurized cylinder (25) is fixedly connected with a rotating rod (26), and the end of the rotating rod (26) away from the pressurized cylinder (25) is rotatably connected with a sliding plate (27).

4. A multi-functional combined cold header as claimed in claim 3, wherein, The front surface of the machine body (9) is fixedly connected with a mounting seat (10), and the intermittent feeding assembly comprises a guide block (70) rotatably arranged on the mounting seat (10), an arc-shaped arm (71), a main guide gear (74) rotatably arranged on the mounting seat (10), a driving gear (73) fixedly connected coaxially with the main guide gear (74), a rotating seat coaxially arranged with the driving gear (73) and rotatably arranged opposite to the driving gear (73) and in a strip shape, a hook (72) rotatably connected to one end of the rotating seat, and a driven guide gear (75) rotatably arranged on the mounting seat (10) and in meshing connection with the main guide gear (74), wherein a sliding groove in a strip shape is formed in the guide block (70), the lower end of the arc-shaped arm (71) is fixedly connected with a round sliding column slidingly connected in the sliding groove, the upper end of the arc-shaped arm (71) is rotatably connected with the end of the rotating seat away from the hook (72), the hook (72) is in meshing arrangement with the teeth of the driving gear (73), the side of the mounting seat (10) away from the main guide gear (74) is provided with a movable wheel (12), the main guide gear (74) is coaxially drivingly connected with the movable wheel (12), the driven guide gear (75) is coaxially drivingly connected with a directional wheel (13) located below the movable wheel (12), and a channel for the passage of the bar is formed between the movable wheel (12) and the directional wheel (13), and the sidewall of the mounting seat (10) is fixedly connected with a wheel cover (11) located above the movable wheel (12).

5. A multi-functional combined cold header as claimed in claim 4, wherein, The front of the body (9) is fixedly connected with a connecting table (8) on one side of the mounting seat (10), the intermittent punch assembly comprises a ejector rod (67) longitudinally penetrating the body (9) to the inside thereof, a striker (61) longitudinally penetrating the connecting table (8) and coaxially arranged with the ejector rod (67), a connecting shaft (63) rotationally connected between the connecting table (8) and the mounting seat (10), a swing arm (62) rotationally connected on the outside of the connecting shaft (63), and a cam (58) fixedly connected between the lower end of the swing arm (62) and the connecting spring (66) and the guide block (70) intermittently coaxially drivingly connected on the front of the body (9), the body (9) is provided with an ejection seat (68) for the ejector rod (67) to penetrate, the swing arm (62) is provided with a containing groove (64) between the connecting spring (66) and the connecting shaft (63), the containing groove (64) is rotationally connected with a receiving wheel (65), the outer ring of the receiving wheel (65) is abuttingly arranged with the outer ring of the cam (58), the bottom surface of the connecting table (8) is provided with a vertical groove, the bottom surface of the striker (61) is provided with a recess, and the upper end of the swing arm (62) extends into the recess.

6. A multi-functional combined cold header as claimed in claim 5, wherein, The material ejecting assembly comprises an inclined and hollow shaft support (39), a lower sliding block (42) slidingly connected in the shaft support (39), an elastic air cylinder (40) fixedly connected in the lower end of the shaft support (39), a connecting rod (41) fixedly connecting the movable end of the elastic air cylinder (40) and the lower sliding block (42), and a transmission swing arm (44) rotationally connected with the lower sliding block (42) through a rotating shaft (43), the upper end of the shaft support (39) is fixedly connected on one side of the body (9), the side of the machine frame away from the shaft support (39) is fixedly connected with two longitudinally arranged reset springs (49), the ends of the two groups of reset springs (49) are fixedly connected with a connecting seat (50), the connecting seat (50) and the swing arm (62) are both rotationally connected with a hinged arm (46), the two hinged arms (46) are fixedly connected with a horizontal shaft (45), the body (9) is fixedly connected with a fixed seat (47), the fixed seat (47) is slidingly connected with two longitudinally arranged push plates (48), and the two hinged arms (46) are respectively rotationally connected with the two push plates (48).

7. A multi-functional combined cold header as claimed in claim 6, wherein The compression assembly comprises an eccentric rocker (76) rotationally connected outside an eccentric shaft (19), a piston (77) rotationally connected with the eccentric rocker (76) at an end away from the eccentric shaft (19), a main connecting cylinder (83), an auxiliary connecting pipe (84) in communication with the main connecting cylinder (83), an air outlet pipe (85) in communication with the main connecting cylinder (83), a pressure sensor (82) fixedly connected to a top surface of a machine body (9), a vertical rod (81) slidably connected in a support cylinder (80) below the pressure sensor (82), wherein the machine body (9) is provided with a horizontal cylinder (78) longitudinally arranged, a vertical cylinder (79) in communication with the horizontal cylinder (78), and a one-way valve in communication with the horizontal cylinder (78) fixedly connected to the machine body (9), the upper end of the vertical rod (81) is in abutment with a probe of the pressure sensor (82), the auxiliary connecting pipe (84) is in communication with the lower end of the vertical cylinder, the main connecting cylinder (83) is in communication with the lower end of the vertical cylinder (79), and the air outlet pipe (85) is in communication with the reciprocating cutting assembly and the material lifting assembly through a connecting pipeline.

8. A multi-functional combined cold header according to claim 7, characterized in that, The connecting pipeline comprises a horizontal air valve (92) arranged on the back of the machine body (9), and a first side air valve (89) and a second side air valve (91) arranged on both sides of the machine body (9), the air outlet pipe (85) is in communication with the horizontal air valve (92) through a first connecting air pipe, the horizontal air valve (92) is in communication with the first side air valve (89) and the second side air valve (91) through a plurality of second connecting air pipes, a plurality of lower air holes (90) are arranged on the side wall of the bottom cover (3) and in communication with the inside thereof, an upper air hole (88) is arranged on the side wall of the machine body (9) and in communication with the inside thereof, a gas seat (86) is fixedly connected in the machine body (9) and located above the material lifting assembly, a gas injection groove (87) is arranged on the gas seat (86) and faces the front of the machine body (9), the first side air valve (89) is in communication with the gas seat (86) through a third connecting air pipe penetrating through the upper air hole (88), the first side air valve (89) is in communication with a plurality of lower air holes (90) through a plurality of fourth connecting air pipes, the second side air valve (91) is in communication with the elastic air cylinder (40) through a fifth connecting air pipe, and the second side air valve (91) is in communication with the pressurizing air cylinder (25) through a sixth connecting air pipe, the horizontal air valve (92), the first side air valve (89), and the second side air valve (91) are all electrically controlled valves, the pressure sensor (82) is coupled with a controller, and the controller is coupled with the horizontal air valve (92), the first side air valve (89), and the second side air valve (91).

9. A multi-functional combined cold header as claimed in claim 6, wherein, The second transmission assembly comprises a first bevel gear (52) fixedly connected with the first gear shaft (51) away from one end of the driven gear (22), a second bevel gear (53) meshingly connected with the first bevel gear (52), a third bevel gear (55) coaxially fixedly connected with the second bevel gear (53) through a second gear shaft (54), a fourth bevel gear (56) meshingly connected with the third bevel gear (55), a third gear shaft (57) penetrating the connecting table (8), and a fourth gear shaft (69) penetrating the mounting seat (10) and coaxially connected with the third gear shaft (57), one side of the body (9) is fixedly connected with a rotating seat, the second gear shaft (54) is rotatably connected in the rotating seat, the cam (58) is fixedly connected on the third gear shaft (57), and the third gear shaft (57) and the fourth gear shaft (69) are coaxially fixedly connected with a first end face tooth (59) and a second end face tooth (60) at one end thereof, respectively, the first end face tooth (59) and the second end face tooth (60) are meshingly connectable, and the fourth gear shaft (69) is fixedly connected with the guide block (70).

10. The multi-functional combined cold header according to claim 1, characterized in that, The bottom cover (3) is fixedly connected with an inclined guide plate (93) inside, the front and back surfaces of the bottom cover (3) are both provided with an open slot, the bottom cover (3) is fixedly connected with an inclined material collecting hopper (94) at the open slot on the front surface, and the thickness direction of the guide plate (93) and the thickness direction of the material collecting hopper (94) are both provided with a chip removal groove (95).

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