Electric threading machine and threading method for construction

Abstract

The invention discloses an electric threading machine for construction and a threading method, belonging to the technical field of electric threading machines, comprising a machine base, wherein a die cutter disc, a slag cleaning component and a traveling component are sequentially installed on the top of the machine base from left to right, wherein a screw rod drives a tube to move forward and backward, a ring gear drives the tube to rotate, the screw rod and the ring gear are threadedly connected, and the traveling component can drive the tube to rotate synchronously; the slag cleaning component comprises a waste plate, a push block, a straight rod, an eccentric disc and a first motor, the waste plate is installed on the top of the machine base, a push block is connected to the inner side wall of the waste plate, the push block is transmission-connected to the eccentric disc through the straight rod, and the power input end of the eccentric disc is connected to the power output end of the first motor, the electric threading machine for construction of the invention adopts the traveling component to fully automatically cut the thread, no manual assistance is required and the threading is stable, the slag cleaning component can mechanically and repeatedly automatically push the threading waste into the drawer, no manual cleaning is required, and work efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of electric threading machines, in particular to an electric threading machine for construction and a threading method. Background Art

[0002] Electric threading machine refers to an electric tool with a forward and reverse device for processing the external thread of the pipe. Also known as: electric pipe cutting and threading machine, wire twisting machine, pipe thread threading machine. The manual pipe thread twisting plate before 1980 was electrified. It makes the pipe thread processing during pipeline installation easy and fast. It reduces the labor intensity of pipeline installation workers. When the threading machine is working, first put the pipe to be threaded into the pipe chuck, hit it and clamp it, press the start switch, the pipe will rotate with the chuck, adjust the size of the die opening on the die head, and set the length of the thread. Then turn the feed handwheel clockwise to make the die knife on the die head close to the end of the rotating pipe with constant force, and the die knife will automatically cut the thread. At the same time, the cooling system automatically sprays oil to cool the die knife. When the thread mouth is processed to the preset length, the die knife will automatically open, the thread mouth processing is completed, turn off the power, hit the chuck, and take out the pipe.

[0003] The existing electric threading machine has the following disadvantages: 1. When threading, the existing electric threading machine needs the staff to manually turn the feed hand wheel so that the die knife on the die head can cut the thread with constant force against the end of the rotating pipe, and it is not possible to thread automatically; 2. The existing electric threading machine will generate a large amount of waste wire when threading, and the waste wire cannot be cleaned automatically. The accumulation of waste wire will hinder threading, and the staff needs to clean it manually. Summary of the invention

[0004] The object of the present invention is to provide an electric threading machine for construction. The electric threading machine for construction of the present invention adopts a traveling component to fully automatically cut threads, does not require manual assistance, and the threading is stable. A slag cleaning component is installed on the top of the machine base, which can mechanically and repeatedly automatically push the threading waste into a drawer, without manual cleaning, which is very convenient, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A construction electric threading machine comprises a machine base, on the top of which are mounted a die cutter disc, a slag cleaning assembly and a travel assembly in sequence from left to right, wherein the travel assembly comprises a three-jaw chuck, a translation assembly and a power assembly, and the right end of the three-jaw chuck is connected to the translation assembly; the translation assembly comprises a push rod, a connecting rod, a slider and a slide rail; wherein the push rod is fixedly connected to the left end of the screw rod, the bottom of the right end of the screw rod is connected to the slider through a connecting rod, the slider is slidably connected to the inner side wall of the slide rail, and the slide rail is opened on the top of the machine base; the left end of the push rod is rotatably connected to the right end of the three-jaw chuck; the power assembly comprises a circular gear, a ring gear, a second motor, a guide rod, a screw rod and a rotating disk, the second motor is fixed on the base, the output end of the second motor is fixedly connected to the circular gear, and the circular gear and the ring gear are in transmission meshing engagement; the left end of the ring gear is fixedly connected to the rotating disk, the left end of the rotating disk is fixedly connected to the guide rod, the guide rod is slidably connected to the three-jaw chuck, the push rod slides through the rotating disk, the screw rod passes through the ring gear and is threadedly connected to the ring gear.

[0007] Preferably, the slag cleaning assembly includes a waste tray, a push block, a straight rod, an eccentric disc and a first motor. The waste tray is installed on the top of the machine base. The inner wall of the waste tray is connected to the push block. The push block is transmission-connected to the eccentric assembly through the straight rod. The eccentric assembly includes an eccentric disc and a first motor. The first motor is installed on one side of the waste tray, and the output end of the first motor is fixedly connected to the eccentric disc. One end of the straight rod is hinged to the push block, and the other end of the straight rod is hinged to the eccentric disc.

[0008] Preferably, a rear ear is welded on the back of the die cutter disc, and a fixing ear is detachably mounted on the middle of the rear ear through a screw and a nut, and the fixing ear is mounted on the top of the machine base.

[0009] Preferably, swivels are welded and fixed at both ends of the straight rod, an eccentric shaft is fixedly provided on one side of the eccentric disc, and the swivel at one end of the straight rod is rotatably connected to the eccentric shaft.

[0010] Preferably, a protective shell is detachably mounted on the outer side wall of the traveling component, and mounting plates are fixedly connected to both ends of the bottom of the protective shell. Screw holes are opened on the surface of the mounting plate and the mounting plate can be detachably mounted on the top of the machine base through the screw holes and bolts.

[0011] Preferably, a waste drawer is slidably connected to the middle of one side of the machine base, and waste discharge grooves are provided on one side of the top of the machine base and one side of the waste tray, and the waste discharge grooves are connected to the waste drawer.

[0012] Preferably, the left end of the push rod is rotatably connected to the right end of the three-jaw chuck through a bearing, and the bearing is fixed to the right end of the three-jaw chuck.

[0013] Preferably, three guide rods are fixedly connected to the left end of the rotating disk, and the three guide rods are all slidably connected to the three-jaw chuck.

[0014] Preferably, an internal thread is provided on the inner wall of the ring gear, and an external thread is provided on the outer wall of the screw rod.

[0015] A threading method for an electric threading machine for construction, the threading method is implemented by using the above-mentioned electric threading machine for construction, and comprises the following steps:

[0016] Step 1: Automatic threading process, first firmly clamp the pipe to be processed with a three-jaw chuck, supply power from an external power source, control the second motor to rotate forward through an external switch, and the pipe will synchronously and stably rotate forward to the die cutter disc to start automatic threading until the threading is completed;

[0017] Step 2: Exit the pipe fitting process. After the threading is completed, the external power supply is powered, and the second motor is controlled to reverse through the external switch. After the pipe fitting is separated from the die cutter, the processed pipe fitting is removed, and the pipe fitting is cleaned and stored in the warehouse;

[0018] Step 3: slag cleaning process, turn on the first motor through an external switch, the first motor drives the eccentric disc to rotate, and pushes the waste wire into the waste bin through the push block to collect the waste wire.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The electric threading machine for construction of the present invention adopts a traveling component that can fully automatically cut and thread, without manual assistance and with stable threading. When working, the pipe to be processed is first firmly clamped by a three-jaw chuck, and an external power supply is supplied. The second motor is controlled to rotate by an external switch, and the second motor drives the circular gear to rotate. Since the outer wall of the circular gear is meshed and connected with a ring gear, the ring gear rotates synchronously and drives the three-jaw chuck and the pipe through the rotating disk; since the inner wall of the ring gear is provided with an internal thread that matches the external thread of the outer wall of the screw rod, the screw rod can move forward while the ring gear rotates, and the three-jaw chuck and the pipe fitting are driven to move by the push rod fixedly installed at the left end of the screw rod, thereby realizing the synchronous rotation and movement of the pipe.

[0021] 2. A connecting rod is fixedly connected to the bottom of the right end of the screw rod. The slider connected by the connecting rod slides on the inner wall of the slide rail, which limits the screw rod and prevents the moving path of the screw rod from deviating.

[0022] 3. When threading, the first motor drives the eccentric disk to rotate, and the rotation of the eccentric disk drives the push block to perform mechanical repetitive reciprocating motion. The push block continuously pushes the waste wire in the waste tray into the waste discharge slot on the inner wall of the waste tray. The waste wire falls into the waste drawer under the action of its own gravity, which is convenient for centralized pouring and cleaning. The waste can be automatically cleared, which solves the problem that a large amount of waste wire will be generated when threading with the existing electric threading machine, and the staff needs to manually clear the waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the electric threading machine after the protective shell is removed according to an embodiment of the present invention;

[0024] Figure 2 Another structural schematic diagram of the electric threading machine after the protective shell is removed according to the embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the overall structure of an electric threading machine according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 The structural diagram at A in the middle;

[0027] Figure 5 Another overall structural diagram of the electric threading machine according to an embodiment of the present invention.

[0028] In the figure: 1. slag cleaning assembly; 101. waste plate; 102. push block; 103. eccentric shaft; 104. straight rod; 105. eccentric disc; 106. first motor; 2. travel assembly; 201. three-jaw chuck; 202. translation assembly; 2021. push rod; 2022. connecting rod; 2023. slider; 2024. slide rail; 203. power assembly; 2031. circular gear; 2032. ring gear; 2033. second motor; 2034. guide rod; 2035. screw rod; 2036. rotating disk; 3. machine base; 4. die cutter disc; 5. rear ear; 6. screw rod; 7. nut; 8. fixing ear; 9. waste discharge trough; 10. waste drawer; 11. protective shell; 12. mounting plate; 13. bolt; 14. screw hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 5 In an embodiment of the present invention, an electric threading machine for construction includes a machine base 3, on the top of which a die cutter disc 4, a slag cleaning component 1 and a travel component 2 are sequentially installed from left to right. The electric threading machine for construction of the present invention adopts the travel component 2 to fully automatically cut the thread, without manual assistance and the threading is stable. The electric threading machine for construction of the present invention is equipped with a slag cleaning component 1 on the top of the machine base 3, which can mechanically and repeatedly automatically push the threading waste into the drawer, without manual cleaning, which is very convenient.

[0031] Embodiment 1

[0032] The slag cleaning component 1 includes a waste tray 101, a push block 102, a straight rod 104, an eccentric disc 105 and a first motor 106. The waste tray 101 is installed on the top of the base 3. The inner wall of the waste tray 101 is connected to the push block 102. The push block 102 is transmission-connected to the eccentric component through the straight rod 104. The eccentric component includes an eccentric disc 105 and a first motor 106. The first motor 106 is installed on one side of the waste tray 101, and the output end of the first motor 106 is fixedly connected to the eccentric disc 105. The output end of the first motor 106 is concentrically arranged with the eccentric disc 105. One end of the straight rod 104 is hinged to the push block 102, and the other end of the straight rod 104 is hinged to the eccentric disc 105; the travel assembly 2 includes a three-jaw chuck 201, a translation assembly 202 and a power assembly 203, and the right end of the three-jaw chuck 201 is connected to the translation assembly 202; wherein, an eccentric shaft 103 is fixedly arranged on one side of the eccentric disc 105, and the eccentric shaft 103 is located at the eccentric position of the eccentric disc 105, and the swivel at one end of the straight rod 104 is rotatably connected to the eccentric shaft 103, and the swivel at one end of the straight rod 104 is rotatably connected to the raised shaft arranged on the push block 102. The electric threading machine for construction of the present invention adopts the travel assembly 2 to fully automatically cut the threading, without manual assistance, and the threading is stable.

[0033] A rear ear 5 is welded on the back of the die cutter disc 4, and a fixed ear 8 is detachably installed in the middle of the rear ear 5 through a screw 6 and a nut 7. The fixed ear 8 is installed on the top of the machine base 3 to facilitate the installation or removal of the die cutter disc 4; the translation assembly 202 includes a push rod 2021, a connecting rod 2022, a slider 2023 and a slide rail 2024; wherein the push rod 2021 is fixedly connected to the left end of the screw rod 2035, and the bottom of the right end of the screw rod 2035 is connected to the slider 2023 through the connecting rod 2022, and the slider 2023 is slidably connected to the inner wall of the slide rail 2024, and the slide rail 2024 is opened on the top of the machine base 3; the left end of the push rod 2021 is rotatably connected to the right end of the three-jaw chuck 201, the left end of the screw rod 2035 is fixedly connected to the push rod 2021, and the bottom of the right end of the screw rod 2035 is fixedly installed with a connecting rod 2022. When the screw rod 2035 moves, it is connected to the connecting rod 202 2, the slider 2023 connected to the travel component 2 synchronously slides on the inner wall of the slide rail 2024, which plays a limiting role and prevents the moving path of the screw rod 2035 from deviating, so that the three-jaw chuck 201 and the pipe fitting can be synchronously and stably rotated forward; the outer wall of the travel component 2 is detachably installed with a protective shell 11, and both ends of the bottom of the protective shell 11 are fixedly connected with a mounting plate 12, and the surface of the mounting plate 12 is provided with a screw hole 14 and can be detachably installed on the top of the machine base 3 through the screw hole 14 and the bolt 13. The protective shell 11 can protect the travel component 2, and has a certain dust-proof effect, and is convenient for disassembly and maintenance; a waste drawer 10 is slidably connected to the middle part of one side of the machine base 3, and a waste discharge groove 9 is provided on one side of the top of the machine base 3 and one side of the waste tray 101, and the waste discharge groove 9 is connected with the waste drawer 10. After the waste silk is pushed into the waste discharge groove 9 by the slag cleaning component 1, it can fall into the waste drawer 10 under the action of its own gravity, which is convenient for centralized pouring and cleaning, and can automatically clean the waste.

[0034] The power assembly 203 includes a circular gear 2031, a ring gear 2032, a second motor 2033, a guide rod 2034, a screw 2035 and a rotating disk 2036. The second motor 2033 is fixed on the base 3, and its output end is fixedly connected to the circular gear 2031. The circular gear 2031 and the ring gear 2032 are in transmission meshing engagement; the left end of the ring gear 2032 is fixedly connected to the rotating disk 2036, and the left end of the rotating disk 2036 is fixedly connected to three guide rods 2034. The three guide rods 2034 are evenly distributed on the rotating disk 2036. The three guide rods 2034 are all slidably connected to the three-jaw chuck 201, and the three-jaw chuck 201 can slide along the guide rods 2034. The ring gear 2032 is rotatably connected to the three-jaw chuck 201 through three guide rods 2034. The inner wall of the ring gear 2032 is provided with an internal thread, and the outer wall of the screw rod 2035 is provided with an external thread. The screw rod 2035 is threadedly connected to the ring gear 2032. The outer wall of the ring gear 2032 is meshedly connected with a circular gear 2031. The power input end of the circular gear 2031 is connected to the power output end of the second motor 2033. When the second motor 2033 rotates forward, the second motor 2033 drives the circular gear 2031 to rotate clockwise. A ring gear 2032 is meshed with the outer wall of the circular gear 2031, and the ring gear 2032 rotates counterclockwise synchronously. Since the inner wall of the ring gear 2032 is provided with an internal thread that matches the external thread of the outer wall of the screw rod 2035, the ring gear 2032 can drive the three-jaw chuck 201 and the pipe fitting to rotate while driving the screw rod 2035 to translate forward / backward. During the forward / backward translation of the screw rod 2035, the three-jaw chuck 201 and the pipe fitting move forward / backward, thereby synchronously realizing the rotation and forward / backward movement of the pipe fitting.

[0035] The working principle of the present invention is as follows: first, the pipe to be processed is firmly clamped by the three-jaw chuck 201, an external power supply is supplied, and the second motor 2033 is controlled to rotate forward through an external switch, and the second motor 2033 drives the circular gear 2031 to rotate clockwise. Since the outer wall of the circular gear 2031 is meshed and connected with the ring gear 2032, the ring gear 2032 rotates counterclockwise synchronously, and the rotation of the ring gear 2032 drives the three-jaw chuck 201 to rotate through the rotating disk 2036; at the same time, since the inner wall of the ring gear 2032 is meshed and connected with the ring gear 2032, the ring gear 2032 rotates counterclockwise synchronously. An internal thread is provided to match the external thread on the outer wall of the screw rod 2035, and the screw rod 2035 can move forward, and the push rod 2021 fixedly installed on the left end of the screw rod 2035 pushes the three-jaw chuck 201 to move forward; a connecting rod 2022 is fixedly installed on the bottom of the right end of the screw rod 2035, and the slider 2023 connected to the screw rod 2035 by the connecting rod 2022 slides synchronously on the inner wall of the slide rail 24, which plays a limiting role, preventing the moving path of the screw rod 2035 from deviating, and driven by the three-jaw chuck 201 The pipe is synchronously and stably rotated forward and automatically rotated to the die cutter disc 4 for full-automatic threading. After threading is completed, the external power supply is supplied, and the second motor 2033 is controlled to reverse through the external switch. The second motor 2033 drives the circular gear 2031 to rotate counterclockwise. Since the outer wall of the circular gear 2031 is meshed and connected with the ring gear 2032, the ring gear 2032 rotates clockwise synchronously, and the pipe can be rotated backward. The pipe is separated from the die cutter disc 4, which is convenient for removing the processed pipe. When threading, the threading waste is on its own The waste silk falls into the waste tray 101 under the action of gravity, and the external power supply is used to turn on the first motor 106 through the external switch. The first motor 106 drives the eccentric disc 105 to rotate. When the eccentric disc 105 rotates, the push block 102 performs mechanical repetitive reciprocating motion under the action of the straight rod 104. The push block 102 continuously pushes the waste silk in the waste tray 101 into the waste discharge slot 9 on the inner wall of the waste tray 101. The waste silk falls into the waste drawer 10 under the action of its own gravity, which is convenient for centralized pouring and cleaning, and can automatically clean the waste.

[0036] Embodiment 2

[0037] This embodiment provides a threading method for an electric threading machine for construction. The threading method is implemented based on an electric threading machine for construction provided in Example 1. The method mainly includes the following steps:

[0038] Step 1: Automatic feeding process, first firmly clamp the pipe to be processed with the three-jaw chuck 201, supply power with external power, control the second motor 2033 to rotate forward through the external switch, and the pipe is synchronously and stably rotated forward to the die cutter disc 4 to start automatic threading until the threading is completed;

[0039] Step 2: Exit the pipe fitting process. After the threading is completed, the external power supply is powered, and the second motor 2033 is controlled to reverse through the external switch. After the pipe fitting is separated from the die cutter 4, the processed pipe fitting is removed, and the pipe fitting is cleaned and stored in the warehouse;

[0040] Step 3: slag cleaning process, the first motor 106 is turned on through an external switch, the first motor 106 drives the eccentric disc 105 to rotate, and the waste silk is pushed into the waste material bin 10 through the push block 102 to collect the waste silk.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric threading machine for construction, comprising a machine base (3), a die cutter disc (4), a slag cleaning assembly (1) and a travel assembly (2) being mounted on the top of the machine base (3) in order from left to right, characterized in that: The traveling assembly (2) comprises a three-jaw chuck (201), a translation assembly (202) and a power assembly (203), wherein the right end of the three-jaw chuck (201) is connected to the translation assembly (202); The translation assembly (202) comprises a push rod (2021), a connecting rod (2022), a slider (2023) and a slide rail (2024); wherein the push rod (2021) is fixedly connected to the left end of the screw rod (2035); the bottom of the right end of the screw rod (2035) is connected to the slider (2023) via the connecting rod (2022); the slider (2023) is slidably connected to the inner wall of the slide rail (2024); and the slide rail (2024) is provided on the top of the machine base (3); the left end of the push rod (2021) is rotatably connected to the right end of the three-jaw chuck (201); The power assembly (203) comprises a circular gear (2031), a ring gear (2032), a second motor (2033), a guide rod (2034), a screw rod (2035) and a rotating disk (2036); the second motor (2033) is fixed on the machine base (3); an output end of the second motor (2033) is fixedly connected to the circular gear (2031); the circular gear (2031) and the ring gear (2032) are in driving meshing engagement; the left end of the ring gear (2032) is fixedly connected to the rotating disk (2036); the left end of the rotating disk (2036) is fixedly connected to the guide rod (2034); the guide rod (2034) is slidably connected to the three-jaw chuck (201); the push rod (2021) slidably penetrates the rotating disk (2036); the screw rod (2035) passes through the ring gear (2032) and is engaged with the ring gear (2032) threaded connection; the slag cleaning component (1) comprises a waste disc (101), a push block (102), a straight rod (104), an eccentric disc (105) and a first motor (106); the waste disc (101) is mounted on the top of the machine base (3); the inner side wall of the waste disc (101) is connected to the push block (102); the push block (102) is transmission-connected to the eccentric component via the straight rod (104); the eccentric component comprises an eccentric disc (105) and a first motor (106); the first motor (106) is mounted on one side of the waste disc (101), and the output end of the first motor (106) is fixedly connected to the eccentric disc (105); one end of the straight rod (104) is hinged to the push block (102), and the other end of the straight rod (104) is hinged to the eccentric disc (105).

2. The electric threading machine for construction according to claim 1, characterized in that: A rear ear (5) is welded on the back of the die cutter disc (4), and a fixing ear (8) is detachably mounted on the middle of the rear ear (5) via a screw rod (6) and a nut (7), and the fixing ear (8) is mounted on the top of the machine base (3).

3. The electric threading machine for construction according to claim 1, characterized in that: Both ends of the straight rod (104) are welded with rotating rings, one side of the eccentric disc (105) is fixedly provided with an eccentric shaft (103), and the rotating ring located at one end of the straight rod (104) is rotatably connected to the eccentric shaft (103).

4. The electric threading machine for construction according to claim 1, characterized in that: A protective shell (11) is detachably mounted on the outer wall of the traveling component (2), and mounting plates (12) are fixedly connected to both ends of the bottom of the protective shell (11). Screw holes (14) are provided on the surface of the mounting plate (12) and the mounting plate (12) can be detachably mounted on the top of the machine base (3) via the screw holes (14) and bolts (13).

5. The electric threading machine for construction according to claim 1, characterized in that: A waste drawer (10) is slidably connected to the middle of one side of the machine base (3), and a waste discharge groove (9) is provided on one side of the top of the machine base (3) and one side of the waste tray (101), and the waste discharge groove (9) is connected to the waste drawer (10).

6. The electric threading machine for construction according to claim 1, characterized in that: The left end of the push rod (2021) is rotatably connected to the right end of the three-jaw chuck (201) via a bearing, and the bearing is fixed to the right end of the three-jaw chuck (201).

7. The electric threading machine for construction according to claim 1, characterized in that: The left end of the rotating disk (2036) is fixedly connected to three guide rods (2034), and the three guide rods (2034) are all slidably connected to the three-jaw chuck (201).

8. The electric threading machine for construction according to claim 1, characterized in that: An internal thread is provided on the inner wall of the ring gear (2032), and an external thread is provided on the outer wall of the screw rod (2035).

9. A threading method for an electric threading machine for construction, the threading method being implemented by an electric threading machine for construction according to any one of claims 2 to 8, characterized in that: The threading method comprises the following steps: Step 1: Automatic threading process, firstly, the pipe to be processed is firmly clamped by the three-jaw chuck (201), and the external power supply is supplied. The second motor (2033) is controlled to rotate forward through the external switch, and the pipe is synchronously and stably rotated forward to the die cutter disc (4) to start automatic threading until the threading is completed; Step 2: exit the pipe fitting process, after the threading is completed, the external power supply is powered, and the second motor (2033) is controlled to reverse through the external switch, and after the pipe fitting is separated from the die cutter (4), the processed pipe fitting is removed, and the pipe fitting is cleaned and stored in the warehouse; Step 3: a slag cleaning process, in which the first motor (106) is turned on by an external switch, and the first motor (106) drives the eccentric disc (105) to rotate, and the waste silk is pushed into the waste material bin (10) by the push block (102), and the waste silk is collected.

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