CN111003247B - A feeding device for welding rod packaging machine based on weight step-by-step control - Google Patents

Abstract

The invention discloses a feeding device for a welding rod packaging machine based on step-by-step weight control. The quick feeding mechanism is arranged above the feeding conveying device, the transition weighing hopper is arranged at the side exit of the feeding conveying device, and the one-by-one screening mechanism is arranged above the transition weighing hopper; In the screening mechanism, the welding rod in the fast feeding mechanism is released to the feeding conveyor, and then transferred to the transition weighing hopper for weighing through the feeding conveyor. The material in the hopper should be unloaded if the weight of the electrode is sufficient. The invention can realize the automatic weighing and feeding of the welding rod, solve the problems of high labor intensity and poor packaging quality caused by manual weighing in the current welding rod packaging process, and improve the feeding efficiency and accuracy of the welding rod packaging machine.

Description

A feeding device for welding rod packaging machine based on weight step-by-step control

technical field

The invention relates to a feeding device for a welding rod packaging machine based on step-by-step control of weight, which is mainly aimed at cylindrical welding rods.

Background technique

The automatic welding rod packaging machine is mainly used to realize the automatic packaging of welding rods. In recent years, with the rapid development of my country's economy, the welding material industry has developed very rapidly, and the demand for welding rods has continued to grow. At present, my country has become the world's largest producer of welding consumables and the country with the largest amount of welding consumables. The production volume of welding rods is increasing year by year, and the packaging of welding rods, as an indispensable link in the production process of welding rods, has a very important impact on the output of welding rods.

Since most companies have strict requirements on the weight of each pack of welding rods, the control of the weight of each pack of welding rods is one of the most important links in the welding rod packaging process. At present, most of the welding electrodes in my country are weighed manually, which requires workers to place the electrodes on the electronic scale, and increase or decrease the electrodes according to the weight obtained by weighing, so that the weight of each package of electrodes is within the required range. This manual weighing method can easily lead to problems such as high labor intensity, low production efficiency, and poor product quality.

Although the weight of each pack of electrodes is a range, the fluctuation range is smaller than the mass of a single electrode, so the control of the electrode weight needs to be very precise, and one more electrode may cause the weight to not meet the requirements; but at the same time, due to the single electrode itself The quality is not large, the number of electrodes contained in each pack of electrodes is about several hundred, and the efficiency issue needs to be considered.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the background art, the purpose of the present invention is to realize the automatic weighing and feeding of the welding rod, and to provide a feeding device for the welding rod packaging machine based on the step-by-step control of weight.

The present invention adopts following technical scheme:

The invention is mainly suitable for the weighing and feeding of the cylindrical electrode, and realizes the precise weighing and feeding of the electrode through the method of step-by-step weight control. Initially, the welding rod is put into the designated position of the rapid feeding mechanism and the one-by-one screening mechanism. Through this device, a group of welding rods with the required weight can be finally obtained, which is convenient for subsequent packaging of the welding rods.

The beneficial effects of the present invention are

The invention includes a support table and a fast feeding mechanism, a feeding conveying device, a transition weighing hopper and a root-by-root screening mechanism installed on the supporting table. The fast feeding mechanism is arranged above the feeding conveying device, and the transition weighing hopper is arranged At the side exit of the feeding conveyor, the one-by-one screening mechanism is arranged above the transition weighing hopper; the welding rod is placed in the rapid feeding mechanism and the one-by-one screening mechanism, and the welding rod in the rapid feeding mechanism is released to the feeding conveyor. , transferred to the transition weighing hopper for weighing through the feeding conveyor device. If the weight of the welding rod in the transition weighing hopper is insufficient, it will be fed to the transition weighing hopper through the screening mechanism one by one. If the weight of the welding rod in the transition weighing hopper is sufficient material.

The fast feeding mechanism includes a fast feeding mechanism support table, a feeding control baffle, a feeding trough, a feeding 86 stepper motor and a feeding trough support frame; the fast feeding mechanism support table is supported and installed on the support. Above the table, the feeding trough is fixed on the support table of the rapid feeding mechanism. The welding rod is placed in the feeding trough. The bottom surface of the feeding trough is an inclined surface. The feeding shaft is fixedly connected. One end of the feeding shaft passes through the side wall of the feeding trough and is connected coaxially with the output shaft of the feeding 86 stepping motor through the first plum blossom coupling. On the feeding 86 motor bracket, the feeding 86 motor bracket is installed on the support table of the fast feeding mechanism through the stepping motor support seat, and the other end of the feeding shaft is hinged and supported in the hole on the other side of the feeding chute.

The feeding and conveying device includes a conveying device support table, a conveying chain support frame, a servo motor, a motor bracket, a servo motor support seat and an upper hopper; The support frame is located below the support table of the rapid feeding mechanism. A chain mechanism is installed in the conveyor chain support frame. Both ends of the sprocket shaft of the chain mechanism are supported and installed in the holes of the side plate of the conveyor chain support frame through their respective flange bearing seats ;The chain of the chain mechanism is fixed with an upper hopper at equal intervals, and the inner bottom surface of the upper hopper is installed with the first weight sensor for weighing the weight of the electrode; the servo motor is fixed on the motor bracket, and the motor bracket is installed on the support through the servo motor support seat On the stage, the output shaft of the servo motor is coaxially connected to the sprocket shaft.

There is a transition weighing hopper under one side of the transport outlet of the chain mechanism. The transition weighing hopper includes a limit plate connecting frame, a limit baffle, a weighing hopper plate and a transition 86 stepper motor; the limit plate connecting frame is fixed It is installed on the support table, and the limit baffles are installed on both sides of the limit plate connecting frame. There are two hopper assemblies in the middle of the limit baffles on both sides; each hopper assembly includes a weighing hopper plate, a weighing shaft , gear, the middle of the weighing hopper plate and the weighing shaft are fixedly connected, the weighing shaft is horizontally arranged, the two ends of the weighing shaft are hinged and supported in the holes on the side plates on both sides of the limit plate connecting frame, and one end of the weighing shaft is The hole shaft extending from the side plate of the limit plate connecting frame is coaxially connected to the gear; the weighing hopper plates of the two hopper assemblies are arranged in a V shape, and the gears at one end of the two weighing shafts of the two hopper assemblies are meshed and connected, and the two A second weight sensor is arranged on the opposite inner side of the bottom of the weighing hopper plate of the hopper assembly; the transition 86 stepper motor is installed on the transition 86 motor bracket, the transition 86 motor bracket is fixed on the support table, and the transition 86 stepper motor output shaft The second plum-blossom coupling is coaxially connected to the weighing shaft of one of the hopper assemblies.

The root-by-root screening mechanism includes a 57 stepping motor, a synchronous belt support frame, a root-by-root screening mechanism support frame, a double-sided tooth synchronous belt and a screening baffle; the root-by-root screening mechanism support frame is fixedly installed on the support table, and the synchronous belt The support frame is fixed on the support frame of the screening mechanism one by one, and the double-sided tooth synchronous belt is installed in the synchronous belt support frame. The synchronous belt is arranged in the conveying direction, and the tooth slot between adjacent teeth is used to accommodate one electrode and can only accommodate one electrode; the outside of the synchronous belt support frame is provided with a 57 stepper motor, and the 57 stepper motor is fixed by the 57 motor bracket On the support frame of the screening mechanism one by one, the output shaft of the 57 stepper motor is connected through the third plum blossom coupling and the pulley of the double-sided tooth synchronous belt to drive the double-sided tooth synchronous belt to move; the upper part of the double-sided tooth synchronous belt is fixedly provided with The screening frame is composed of screening side plates located on both sides of the double-sided tooth synchronous belt and two vertical and parallel screening baffles connected between the screening side plates on both sides. A welding rod is placed in the rectangular space enclosed by the block screening baffles, and the bottom end of the screening baffle is flush with the upper edge of the teeth of the double-sided tooth synchronous belt body.

Two feeding troughs are arranged on the support table of the fast feeding mechanism, and the two feeding troughs are arranged oppositely.

The flat surface of the fast feeding mechanism support table at the bottom of the feeding trough is provided with a through groove for the falling through of the welding rod.

The transmission outlet side of the double-sided tooth synchronous belt is located just above between the two hopper assemblies in the transition weighing hopper.

Using the invention, the automatic weighing and feeding of the welding rod can be realized. The feeding method of coarse screening first and then fine screening is adopted for fast feeding to ensure efficiency; it is also equipped with a screening mechanism for precise weight control, and the weight is accurately controlled by real-time detection, which ensures the feeding accuracy and improves the efficiency.

The invention solves the problems of high labor intensity and poor packaging quality caused by manual weighing in the current welding rod packaging process, and greatly improves the feeding efficiency and accuracy of the welding rod packaging machine.

Description of drawings

Fig. 1 is the front view of the feeding device of the welding rod packaging machine of the present invention;

Fig. 2 is the perspective view of the feeding device of the welding rod packaging machine of the present invention;

3 is a perspective view of the fast feeding mechanism of the feeding device of the welding rod packaging machine of the present invention;

4 is a sectional view of the fast feeding mechanism of the feeding device of the welding rod packaging machine of the present invention;

FIG. 5 is a perspective view of the feeding conveying device of the feeding device of the welding rod packaging machine of the present invention;

6 is a schematic diagram of the transition weighing hopper of the feeding device of the welding rod packaging machine of the present invention;

Fig. 7 is the installation perspective view of the transition weighing hopper of the feeding device of the welding rod packaging machine of the present invention;

8 is a schematic diagram of the state before and after the transition weighing hopper of the feeding device of the welding rod packaging machine of the present invention is opened;

Figure 8 (a) is a schematic diagram of the state before the transition weighing hopper of the feeding device of the welding rod packaging machine of the present invention is opened;

Figure 8 (b) is a schematic diagram of the state after the transition weighing hopper of the feeding device of the welding rod packaging machine of the present invention is opened;

9 is a perspective view of a root-by-root screening mechanism of the feeding device of the welding rod packaging machine of the present invention;

FIG. 10 is a schematic diagram of the separation principle of the double-sided tooth synchronous belt of the one-by-one screening mechanism of the feeding device of the electrode packaging machine of the present invention.

In the figure, the fast feeding mechanism 1, the feeding conveying device 2, the transition weighing hopper 3, the one-by-one screening mechanism 4, the support table 5, the welding rod 6; the fast feeding mechanism support table 101, the feeding control baffle 102, the method Lan bearing seat 103, feeding chute 104, feeding 86 stepping motor 105, first plum blossom coupling 106, feeding 86 motor bracket 107, stepping motor support 108, feeding chute support 109; transmission Device support table 201, flange bearing seat 202, conveyor chain support frame 203, chain 204, servo motor 205, motor bracket 206, servo motor support seat 207, coupling 208, sprocket 209, sprocket shaft 210, hopper 211 , the first weight sensor 212; the limit plate connecting frame 301, the bearing seat 302, the gear 303, the limit baffle 304, the weighing hopper plate 305, the second plum coupling 306, the transition 86 stepper motor 307, the transition 86 Motor bracket 308, second weight sensor 309; 57 motor bracket 401, 57 stepper motor 402, third plum coupling 403, synchronous belt support frame 404, root-by-root screening mechanism support frame 405, flange bearing seat 406, double Face tooth timing belt 407 , screening baffle 408 .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in Figure 1 and Figure 2, the specific implementation of the device includes a support table 5 and a fast feeding mechanism 1 installed on the support table 5, a feeding conveying device 2, a transition weighing hopper 3 and a root-by-root screening mechanism 4. The feeding mechanism 1 is arranged above the feeding conveying device 2, the transition weighing hopper 3 is arranged at the side exit of the feeding conveying device 2, and the one-by-one screening mechanism 4 is arranged above the transition weighing hopper 3; In the feeding mechanism 1 and the one-by-one screening mechanism 4, the welding rod 6 in the rapid feeding mechanism 1 is released to the feeding conveying device 2, and is transferred to the transition weighing hopper 3 through the feeding conveying device 2 for weighing. If the weight of the welding rod in the heavy hopper 3 is insufficient, the material is fed to the transition weighing hopper 3 through the one-by-one screening mechanism 4, and the material is discharged when the weight of the welding rod in the transition weighing hopper 3 is sufficient.

As shown in FIG. 3 and FIG. 4 , the fast feeding mechanism 1 includes a fast feeding mechanism support table 101, a feeding control baffle 102, a feeding trough 104, a feeding 86 stepper motor 105 and a feeding trough support frame 109; the fast feeding mechanism support table 101 is supported and installed above the supporting table 5, the feeding trough 104 is fixed on the fast feeding mechanism support table 101 through the feeding trough support frame 109, and the feeding trough 104 is placed with a welding rod 6. The bottom surface of the feeding chute 104 is an inclined surface, and a feeding control baffle 102 is arranged above the inclined surface. The feeding control baffle 102 is fixedly connected with the feeding rotating shaft. The feeding rotating shaft is arranged horizontally, and one end of the feeding rotating shaft passes through the feeding shaft. The side wall of the trough 104 is coaxially connected with the first plum blossom coupling 106 and the output shaft of the feeding 86 stepper motor 105. The bracket 107 is installed on the support table 101 of the rapid feeding mechanism through the stepping motor support base 108, and the other end of the feeding shaft is hingedly supported and installed in the hole on the other side of the feeding groove 104; All of them are hingedly supported by the MT150 flange bearing seat 103 and installed in the holes of the groove walls on both sides of the feeding chute 104 . The feeding 86 stepping motor 105 drives the feeding shaft and its fixed feeding control baffle 102 to rotate, and drives the bottom of the feeding control baffle 102 to block the welding rod 6 in the feeding chute 104 from falling or releasing along the inclined plane.

In a specific implementation, two feeding troughs 104 are arranged on the support table 101 of the rapid feeding mechanism, and the two feeding troughs 104 are arranged opposite to each other.

As shown in FIG. 5 , the feeding conveyor 2 includes a conveyor support table 201, a conveyor chain support frame 203, a servo motor 205, a motor bracket 206, a servo motor support base 207 and an upper hopper 211; the conveyor chain support frame 203 passes through the conveyor device The support table 201 is installed on the support table 5, and the conveyor chain support frame 203 is located under the support table 101 of the quick feeding mechanism. , the annular chain 204 is wound around the sprockets 209 on both sides, the sprockets 209 on both sides are coaxially connected to the sprocket shaft 210, and both ends of the sprocket shaft 210 of the chain mechanism are supported and mounted on the respective flange bearing seats 202. A feeding hopper 211 is fixed on the chain 204 of the chain mechanism at equal intervals in the hole on the side plate of the conveyor chain support frame 203, and a first weight sensor 212 for weighing the weight of the welding rod is installed on the inner bottom surface of the feeding hopper 211; the feeding trough The flat surface of the support table 101 of the rapid feeding mechanism at the bottom of 104 is provided with a through groove for the electrode to fall through, and the upper hopper 211 is located under the through groove to receive the electrode dropped from the through groove.

The servo motor 205 is fixed on the motor bracket 206, the motor bracket 206 is installed on the support table 5 through the servo motor support base 207, and the output shaft of the servo motor 205 is coaxially connected to the sprocket shaft 210 through the LX1 coupling 208; the operation of the servo motor 205 drives The sprocket shaft 210 rotates to drive the chain mechanism to move, and drives the upper hopper 211 on the chain mechanism to drive along the chain 204 .

As shown in Fig. 6-Fig. 8, a transition weighing hopper 3 is arranged below the transport outlet of the chain mechanism. The transition weighing hopper 3 includes a limit plate connecting frame 301, a limit baffle 304, a weighing hopper plate 305 and a transition 86 stepping motor 307; the limit plate connecting frame 301 is fixedly installed on the support table 5, the limit baffles 304 are installed on both sides of the limit plate connecting frame 301, and two limit baffles 304 on both sides are arranged in the middle. Each hopper assembly includes a weighing hopper plate 305, a weighing shaft, a gear 303, the middle of the weighing hopper plate 305 is fixedly connected with the weighing shaft, the weighing shaft is horizontally arranged, and the two ends of the weighing shaft pass through KP000 bearings The seat 302 is hingedly supported and installed in the holes of the side plates on both sides of the limit plate connecting frame 301, and one end of the weighing shaft protrudes from the hole shaft of the side plate of the limit plate connecting frame 301 to connect the gear 303 coaxially; The weighing hopper plate 305 is arranged in a V shape, the gears 303 at one end of the two weighing shafts of the two hopper assemblies are meshed and connected, and the opposite inner sides of the bottom of the weighing hopper plates 305 of the two hopper assemblies are arranged with a second weight sensor 309; The transition 86 stepping motor 307 is installed on the transition 86 motor bracket 308, the transition 86 motor bracket 308 is fixed on the support table 5, and the output shaft of the transition 86 stepping motor 307 passes through the second plum coupling 306 and one of the hopper assemblies The weighing shafts of the two hopper assemblies are coaxially connected; the operation of the transition 86 stepping motor 307 drives the weighing shaft of one of the hopper assemblies to rotate, and drives the weighing hopper plates 305 of the two hopper assemblies through the meshing relationship of the two gears 303 of the two hopper assemblies. The middle vertical plane between the two weighing hopper plates 305 rotates and swings symmetrically, which drives the bottoms of the two weighing hopper plates 305 to close or separate.

As shown in Figures 9 and 10, the root-by-root screening mechanism 4 includes a 57 stepper motor 402, a timing belt support frame 404, a root-by-root screening mechanism support frame 405, a double-sided tooth timing belt 407 and a screening baffle 408; The mechanism support frame 405 is fixedly installed on the support table 5, the synchronous belt support frame 404 is fixed on the one-by-one screening mechanism support frame 405, and the synchronous belt support frame 404 is installed with a ring-shaped closed double-sided tooth synchronous belt 407, and the double-sided teeth are synchronized with each other. The belt 407 includes a synchronous belt body and a synchronous pulley. The outer surface of the synchronous belt pulley has a tooth structure. The inner and outer surfaces of the synchronous belt body have a tooth structure. The synchronous belt body is wound around two synchronous pulleys on both sides; the double-sided toothed synchronous belt The outer surface of the synchronous belt body of 407 is set into a strip-shaped tooth structure, each tooth is arranged along the conveying direction perpendicular to the double-sided tooth synchronous belt 407, and the tooth slot between adjacent teeth is used to accommodate a welding rod and can only accommodate A welding rod; a 57 stepper motor 402 is provided on the outside of the synchronous belt support frame 404, and the 57 step motor 402 is fixed on the root-by-root screening mechanism support frame 405 through the 57 motor bracket 401, and the output shaft of the 57 step motor 402 passes through the third plum blossom. The coupling 403 is connected with the pulley of the double-sided toothed synchronous belt 407, and the two ends of the pulley shaft are hinged on both sides of the synchronous belt support frame 404 through the flange bearing seat 406 to drive the double-sided toothed synchronous belt 407 to move; A screening frame is fixed above the belt 407, and the screening frame is fixed on the synchronous belt support frame 404. The screening frame is composed of screening side plates located on both sides of the double-sided toothed synchronous belt 407 and a vertical parallel connection between the screening side plates on both sides. The two screening baffles 408 are arranged, the screening side plates on both sides and the rectangular space enclosed by the two screening baffles 408 are placed with the welding rod 6, the bottom end of the screening baffle 408 and the double-sided tooth timing belt 407 timing belt The upper edges of the teeth of the main body are flush, so that when the 57 stepper motor 402 runs to drive the double-sided tooth synchronous belt 407 to move, the welding rod placed in the rectangular space can only be accommodated in the tooth slot between the adjacent teeth, and will not be removed from the teeth. The bottom end of the screening baffle 408 and the tooth structure of the double-sided toothed timing belt 407 leak out and be transported, and the double-sided toothed timing belt 407 can only transport one electrode in a single tooth slot in turn to achieve one-by-one separation. The transmission outlet side of the double-sided tooth timing belt 407 is located just above between the two hopper assemblies in the transition weighing hopper 3 .

As shown in Figures 1 and 2, the rapid feeding mechanism 1, the feeding conveyor 2, the transition weighing hopper 3 and the one-by-one screening mechanism 4 are fixed on the support table 5, and the weight is controlled by the method of coarsening first and then fine. Coarse sieving, fine sieving and root-by-root feeding three stations, the specific process is:

The fast feeding mechanism 1 sends the welding rod to the feeding hopper 211 of the lower feeding conveying device 2. The feeding hopper 211 detects the total weight of the welding rod in the hopper in real time. When the weight exceeds a certain value, the rapid feeding mechanism 1 is controlled to stop feeding. The fast feeding mechanism 1 includes two parts: coarse screen control and fine screen control. The two control methods are basically the same. The coarse screen part has a faster feeding speed, and the fine screen part mainly ensures accuracy.

After the weight of the welding rod is controlled by these two parts, the feeding hopper 211 sends the welding rod into the transition weighing hopper 3, the latter measures the total mass of the welding rod, and compares it with the standard range to determine whether the welding rod needs to be added and the amount of the welding rod required. Quantity, and then control the one-by-one screening mechanism 4, which adds the specified number of welding rods as needed. At this time, the weighing is completed, and the weight of the welding rods in the transition weighing hopper 3 is the weight within the required range. The transition weighing hopper 3 is opened, and the welding rod enters the lower conveying device 3; during the actual operation, rough screening, fine screening and root-by-root screening at different stations are carried out at the same time to improve efficiency.

As shown in FIG. 3 , the fast feeding mechanism 1 of the feeding device of the welding rod packaging machine based on the step-by-step weight control mainly controls the angle between the feeding control baffle 102 and the slope of the feeding chute 104 through the 86 stepper motor 105 . To control the discharge speed of the welding rod, the welding rod slides down the slope of the feeding trough 104 to realize automatic feeding. When one feeding ends, the 86 stepper motor 105 controls the feeding control baffle 102 to make the angle between the feeding control baffle 102 and the slope smaller, preventing the electrode from continuing to discharge; the mechanism includes a coarse screen control part and a fine screen control part, The initial angle between the feeding control baffle 102 and the slope of the feeding chute 104 in the coarse screen part on the left is relatively large to improve feeding efficiency, and the initial angle in the fine screen part on the right is relatively small to ensure accuracy; The material trough 104 is divided into two areas to prevent the newly added welding rod from impacting the feeding control baffle 102, resulting in a sudden large discharge of the welding rod, as shown in FIG. 4 .

As shown in Figure 5, since the weight control has to pass through three stations: coarse screening, fine screening and feeding one by one, the transfer of the welding rod between these three stations needs to be realized by the feeding conveyor 2, and the servo motor 205 is The second movement makes the upper hopper 211 advance one station; in order to detect the weight of the welding rod in the hopper, the upper hopper 211 is equipped with a first weight sensor 212 . The first weight sensor 212 is used to detect the weight of the welding rod in the feeding hopper 211 .

As shown in Figures 6 and 7, the second weight sensor 309 is used to detect the weight of the welding rod in the weighing hopper plate 305. After the weight meets the requirements, the transition 86 stepper motor 307 controls the rotation of the weighing hopper plate 305, so that the two weighing The bottom of the weighing hopper plate 305 is separated to form a middle gap, so that the hopper is opened and the welding rod is dropped from the middle gap to the bottom. The state diagram of the weighing hopper 305 before and after opening is shown in FIG.

As shown in Figure 9, in order to ensure the quality of the product and make the weight of each pack of welding rods strictly within the required range, the welding rods are separated one by one by the screening mechanism 4 and then added to the transition weighing hopper 3 one by one. In the middle of the baffle 408, the 57 stepper motor 402 drives the double-sided toothed synchronous belt 407 to move. Since each groove outside the double-sided toothed synchronous belt 407 can just accommodate a welding rod, after being blocked by the screening baffle 408, the double-sided toothed synchronous belt 407 can only accommodate one welding rod. There is only one electrode left in each groove of the toothed timing belt 407 to realize the separation of the electrodes one by one, and then by controlling the rotation angle of the 57 stepper motor 402, the angle of each rotation makes the electrode on one groove fall. To the transition weighing hopper 3, the welding rods are fed one by one.

In this way, the invention can realize automatic weighing and feeding of the welding rod, solve the problems of high labor intensity and poor packaging quality caused by manual weighing in the current welding rod packaging process, and improve the feeding efficiency and efficiency of the welding rod packaging machine. precision.

Claims (4)

1. The utility model provides a welding rod packagine machine loading attachment based on weight fractional control which characterized in that: the automatic weighing device comprises a supporting table (5), a quick feeding mechanism (1), a feeding conveying device (2), a transitional weighing hopper (3) and a root-by-root screening mechanism (4), wherein the quick feeding mechanism (1), the transitional weighing hopper (3) and the root-by-root screening mechanism (4) are arranged on the supporting table (5), the quick feeding mechanism (1) is arranged above the feeding conveying device (2), the transitional weighing hopper (3) is arranged at an outlet on the side of the feeding conveying device (2), and the root-by-root screening mechanism (4) is arranged above the transitional weighing hopper (3); welding rods (6) are placed in the rapid feeding mechanism (1) and the root-by-root screening mechanism (4), the welding rods (6) in the rapid feeding mechanism (1) are released onto the feeding conveying device (2) and conveyed to the transitional weighing hopper (3) through the feeding conveying device (2) to be weighed, if the weight of the welding rods in the transitional weighing hopper (3) is insufficient, the welding rods are fed into the transitional weighing hopper (3) through the root-by-root screening mechanism (4), and the welding rods are discharged under the condition that the weight of the welding rods in the transitional weighing hopper (3) is sufficient;

the rapid feeding mechanism (1) comprises a rapid feeding mechanism support table (101), a feeding control baffle (102), a feeding trough (104), a feeding 86 stepping motor (105) and a feeding trough support frame (109); a fast feeding mechanism supporting platform (101) is supported and installed above a supporting platform (5), a feeding trough (104) is fixed on the fast feeding mechanism supporting platform (101), a welding rod (6) is placed in the feeding trough (104), the bottom surface of the feeding trough (104) is an inclined surface, a feeding control baffle (102) is arranged above the inclined surface, the feeding control baffle (102) is fixedly connected with a feeding rotating shaft, one end of the feeding rotating shaft penetrates through the trough wall on one side of the feeding trough (104) and is coaxially connected with an output shaft of a feeding 86 stepping motor (105) through a first quincuncial coupler (106), the feeding 86 stepping motor (105) is arranged on a feeding 86 motor support (107) of a machine body, the feeding 86 motor support (107) is installed on the fast feeding mechanism supporting platform (101) through a stepping motor supporting seat (108), and the other end of the feeding rotating shaft is hinged and supported and installed in a hole in the trough wall on the other side of the feeding trough (;

the feeding conveying device (2) comprises a conveying device supporting table (201), a conveying chain supporting frame (203), a servo motor (205), a motor support (206), a servo motor supporting seat (207) and a feeding hopper (211); the conveying chain supporting frame (203) is installed on the supporting table (5) through the conveying device supporting table (201), the conveying chain supporting frame (203) is located below the rapid feeding mechanism supporting table (101), a chain mechanism is installed in the conveying chain supporting frame (203), and two ends of a chain wheel shaft (210) of the chain mechanism are supported and installed in holes of side plates of the conveying chain supporting frame (203) through respective flange bearing seats (202); a chain (204) of the chain mechanism is fixedly provided with a feeding hopper (211) at equal intervals, and the inner bottom surface of the feeding hopper (211) is provided with a first weight sensor (212) for weighing the weight of the welding rod; the servo motor (205) is fixed on the motor support (206), the motor support (206) is installed on the support table (5) through the servo motor support seat (207), and an output shaft of the servo motor (205) is coaxially connected with a sprocket shaft (210);

a transitional weighing hopper (3) is arranged below one side of the conveying outlet of the chain mechanism, and the transitional weighing hopper (3) comprises a limiting plate connecting frame (301), a limiting baffle plate (304), a weighing hopper plate (305) and a transitional 86 stepping motor (307); the limiting plate connecting frame (301) is fixedly arranged on the supporting table (5), limiting baffles (304) are arranged on two sides of the limiting plate connecting frame (301), and two hopper assemblies are arranged in the middles of the limiting baffles (304) on the two sides; each hopper assembly comprises a weighing hopper plate (305), a weighing rotating shaft and a gear (303), the middle part of the weighing hopper plate (305) is fixedly connected with the weighing rotating shaft, the weighing rotating shaft is horizontally arranged, two ends of the weighing rotating shaft are hinged and supported in holes of side plates on two sides of a limiting plate connecting frame (301), and one end of the weighing rotating shaft extends out of a hole shaft of the side plate of the limiting plate connecting frame (301) and is coaxially connected with the gear (303); weighing hopper plates (305) of the two hopper components are arranged in a V shape, gears (303) at one ends of two weighing rotating shafts of the two hopper components are meshed and connected, and second weight sensors (309) are arranged on the inner side surfaces, opposite to the bottom of the weighing hopper plates (305), of the two hopper components; a transition 86 stepping motor (307) is arranged on a transition 86 motor support (308), the transition 86 motor support (308) is fixed on the support table (5), and an output shaft of the transition 86 stepping motor (307) is coaxially connected with a weighing rotating shaft of one hopper assembly through a second plum coupling (306);

the root-by-root screening mechanism (4) comprises a 57 stepping motor (402), a synchronous belt supporting frame (404), a root-by-root screening mechanism supporting frame (405), a double-sided tooth synchronous belt (407) and a screening baffle (408); the device comprises a support table (5), a support frame (405) of the screening mechanism one by one is fixedly arranged on the support table (5), a synchronous belt support frame (404) is fixed on the support frame (405) of the screening mechanism one by one, a double-sided tooth synchronous belt (407) is arranged in the synchronous belt support frame (404), the outer surface of a synchronous belt body of the double-sided tooth synchronous belt (407) is set into a tooth structure, each tooth is arranged along the conveying direction perpendicular to the double-sided tooth synchronous belt (407), and a tooth groove between every two adjacent teeth is used for accommodating one welding rod and can; a 57 stepping motor (402) is arranged on the outer side of the synchronous belt support frame (404), the 57 stepping motor (402) is fixed on the support frame (405) of the one-by-one screening mechanism through a 57 motor support frame (401), and an output shaft of the 57 stepping motor (402) is connected with a belt wheel of a double-sided tooth synchronous belt (407) through a third plum coupling (403) to drive the double-sided tooth synchronous belt (407) to move; the fixed screening frame that is equipped with in double faced tooth hold-in range (407) top, the screening frame comprises two screening baffles (408) of vertical parallel arrangement who is located the screening curb plate of double faced tooth hold-in range (407) both sides and connects between the both sides screening curb plate, placed welding rod (6) in the rectangle space that the screening curb plate of both sides and two screening baffles (408) surround, the bottom of screening baffle (408) and the tooth of double faced tooth hold-in range (407) hold-in range body go up the reason parallel and level.

2. The feeding device of the welding rod packaging machine based on the weight step-by-step control as claimed in claim 1, wherein: two feeding troughs (104) are arranged on the quick feeding mechanism supporting platform (101), and the two feeding troughs (104) are arranged oppositely.

3. The feeding device of the welding rod packaging machine based on the weight step-by-step control as claimed in claim 1, wherein: a through groove for the welding rod to fall through is formed in the surface of a quick feeding mechanism supporting table (101) at the bottom of the feeding trough (104).

4. The feeding device of the welding rod packaging machine based on the weight step-by-step control as claimed in claim 1, wherein: and the transmission outlet side of the double-sided tooth synchronous belt (407) is positioned right above the position between the two hopper components in the transitional weighing hopper (3).

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