Magnetic type auxiliary heating device for welding power supply cable

Abstract

The invention relates to a magnetic type auxiliary heating device for welding a power supply cable. The magnetic type auxiliary heating device comprises a first arc flexible heating piece, a first adsorption piece, a second arc flexible heating piece, a second adsorption piece and a telescopic abutting piece. When heat conduction is needed, welding seams of the two to-be-welded welding pieces are in butt joint; then the first arc flexible heating piece and the second arc flexible heating piece make contact with the welding piece, then the second adsorption piece is connected with the first adsorption piece in an adsorption mode, so that the first arc flexible heating piece and the second arc flexible heating piece surround the welding piece, and the device is fixed to the welding piece; and then the first arc flexible heating piece and the second arc flexible heating piece are electrified for preheating, and the purpose of facilitating mounting and dismounting is achieved through magnetic adsorption. In addition, when welding parts of different sizes need to be adapted, the length of the telescopic abutting part is adjusted to change the shape of the first arc flexible heating piece and the shape of the second arc flexible heating piece, and the welding parts are evenly heated.

Description

Technical Field

[0001] The present application relates to the technical field of welding processing, and in particular to a magnetic suction auxiliary heating device for power supply cable welding. Background Art

[0002] Welding is generally divided into fusion welding, brazing and resistance welding (also called pressure welding). The essence of welding is to heat or pressurize, or heat and pressurize at the same time, fill with metal or use the weld itself to make the weld form an atomic bond. The role of heating is to melt the metal and connect, and the purpose of pressurizing is to make the weld tight.

[0003] In order to improve the welding quality, preheating is required before the welding process. The purpose of preheating before welding includes: preheating can reduce the cooling rate of the welded joint, which is conducive to the escape of diffused hydrogen in the weld metal and can avoid hydrogen-induced cracks. Preheating can extend the cooling time of the heat-affected zone in the temperature range of 800-500℃. Preheating can reduce the constraint of the welded structure, which is particularly obvious for reducing the constraint of the fillet joint. As the preheating temperature increases, the crack rate decreases.

[0004] In some prior arts, the clamping point contact area of ​​the welding auxiliary preheating device is small, resulting in uneven heating and easily causing large residual stress inside the material, thereby affecting the improvement of joint performance and the welding quality; what is even more inconvenient is that the fixing structure of the device used to fix on the welded part is complex, resulting in inconvenience in disassembly and installation, and causing damage to the outer surface of the welded part. Summary of the invention

[0005] An embodiment of the present application provides a magnetic auxiliary heating device for power supply cable welding to solve the problems of uneven heating and inconvenient disassembly of welding auxiliary preheating devices in related technologies.

[0006] In a first aspect, a magnetic suction auxiliary heating device for power cable welding is provided, comprising:

[0007] A first arc flexible heating sheet, the outer side of which is correspondingly connected to a first adsorption member;

[0008] A second arc flexible heating sheet is arranged opposite to the first arc flexible heating sheet to enclose a space for accommodating the parts to be welded; a second adsorption member is connected to the outer side of the second arc flexible heating sheet; upper and lower ends of the second adsorption member are connected to the upper and lower ends of the first adsorption member by magnetic adsorption;

[0009] A telescopic abutment member, which is mounted on the first adsorption member and the second adsorption member, one end of the telescopic abutment member is connected to the first arc flexible heating sheet and the second arc flexible heating sheet, and the other end of the telescopic abutment member is passed through the first adsorption member or the second adsorption member;

[0010] When it is necessary to deal with welding parts of different sizes, the telescopic supporting member is extended or contracted to change the shapes of the first arc flexible heating sheet and the second arc flexible heating sheet to adjust the accommodating space.

[0011] In some embodiments, the first arc flexible heating sheet and the second arc flexible heating sheet both include a flexible arc metal sheet and a plurality of heating tubes; the plurality of heating tubes are distributed along the length direction of the flexible arc metal sheet, and are passed through the flexible arc metal sheet along the width direction of the flexible arc metal sheet; the heating tubes are externally connected to a power supply device.

[0012] In some embodiments, the first arc flexible heating sheet and the second arc flexible heating sheet each further include a T-shaped connecting block, and the T-shaped connecting block is arranged along the width direction of the flexible arc metal sheet;

[0013] The first adsorption member and the second adsorption member are both provided with connecting rails, the connecting rails are provided with slide grooves, and the T-shaped connecting blocks are movably arranged in the slide grooves; the first adsorption member or the second adsorption member is provided with a fixing block for fixing to external equipment.

[0014] In some embodiments, the first adsorption member is a steel metal arc block; the second adsorption member is an electromagnet arc block, and a terminal head is provided on the electromagnet arc block.

[0015] In some embodiments, the first adsorbent and the second adsorbent both include an aluminum arc block and a bar electromagnet; the upper and lower ends of the aluminum arc block are connected to the bar electromagnet, and the bar electromagnet is provided with a terminal head; when connection is required, the magnetic properties of the bar electromagnet of the first adsorbent and the second adsorbent are opposite; when disassembly is required, the magnetic properties of the bar electromagnet of the first adsorbent and the second adsorbent are the same.

[0016] In some embodiments, the telescopic abutment member includes a threaded rod, a rotating disk, and an abutment seat;

[0017] The first adsorption member and the second adsorption member are both provided with threaded holes, the threaded rod is installed in the threaded hole, and one end is rotatably connected to the supporting seat, and the other end is fixedly connected to the rotating disk; the shape of the supporting surface of the supporting seat is the same as that of the first arc flexible heating plate and the second arc flexible heating plate.

[0018] In some embodiments, a mounting member is provided on the first adsorption member or the second adsorption member, and a temperature sensor is provided on the mounting member.

[0019] In some embodiments, the mounting member includes a support rod and an arc ring, the temperature sensor is arranged on the arc ring along its length, and the arc ring is made of high temperature resistant plastic.

[0020] In some embodiments, a sound alarm device is provided on the mounting member, which is used to emit a warning sound after the detection value of the temperature sensor reaches a set value.

[0021] In a second aspect, a power supply cable welding method is provided, which comprises the following steps:

[0022] Step 1: Provide at least two magnetic auxiliary heating devices for power cable welding;

[0023] Step 2: Butt the welds of the two welded parts to be welded;

[0024] Step 3: contact the first arc flexible heating sheet and the second arc flexible heating sheet with the welding piece, and then connect the second adsorption piece with the first adsorption piece by adsorption, so that the first arc flexible heating sheet and the second arc flexible heating sheet surround the welding piece, and fix the device on the welding piece;

[0025] Step 4: After repeating the above steps to install another device on the weldment, the first arc flexible heating sheet and the second arc flexible heating sheet are powered on for preheating.

[0026] The beneficial effects of the technical solution provided by this application include:

[0027] (1) The embodiment of the present application provides a magnetic auxiliary heating device and welding method for power supply cable welding, which are used to butt the welds of two welded parts to be welded when heat conduction is required; then the first arc flexible heating sheet and the second arc flexible heating sheet are brought into contact with the welded part, and then the second adsorption member is adsorbed and connected to the first adsorption member, so that the first arc flexible heating sheet and the second arc flexible heating sheet surround the welded part and the device is fixed on the welded part; after repeating the above steps to install another device on the welded part, the first arc flexible heating sheet and the second arc flexible heating sheet are powered on for preheating, thereby utilizing magnetic adsorption to facilitate installation and disassembly.

[0028] (2) When it is necessary to adapt to welding parts of different sizes, the length of the telescopic supporting member is adjusted to change the shapes of the first arc flexible heating sheet and the second arc flexible heating sheet so that the welding part can be heated evenly.

[0029] (3) The first arc flexible heating sheet and the second arc flexible heating sheet both include a T-shaped connecting block, which is arranged along the width direction of the flexible arc metal sheet; the first adsorption component and the second adsorption component are both provided with connecting guide rails, and the connecting guide rails are provided with sliding grooves. The arrangement of the sliding grooves and the T-shaped connecting blocks can facilitate the installation of the first arc flexible heating sheet and the second arc flexible heating sheet, and facilitate maintenance and replacement.

[0030] (4) The arc ring is made of high temperature resistant plastic. The mounting part is provided with a sound alarm device, which is used to emit a warning sound when the detection value of the temperature sensor reaches the set value; it can remind personnel to know that the heating temperature has been reached, because the preheating temperature of different metals is different, thereby enhancing the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of a first-perspective view of a magnetic auxiliary heating device for power cable welding provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of a second viewing angle of a magnetic suction auxiliary heating device for power cable welding provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a magnetic auxiliary heating device for power cable welding provided in an embodiment of the present application during welding;

[0035] Figure 4 A schematic diagram of a magnetic auxiliary heating device for power cable welding provided in an embodiment of the present application without a power supply device;

[0036] Figure 5 The first adsorption member provided in the embodiment of the present application is a steel metal arc block; the second adsorption member is a schematic diagram of an electromagnet arc block;

[0037] Figure 6 A schematic diagram of the connection between the T-shaped connecting block and the telescopic supporting member and the first arc flexible heating sheet and the second arc flexible heating sheet provided in an embodiment of the present application from a first viewing angle;

[0038] Figure 7 A schematic diagram from a second viewing angle of the connection between the T-shaped connecting block and the telescopic supporting member and the first arc flexible heating sheet and the second arc flexible heating sheet provided in an embodiment of the present application;

[0039] Figure 8 A schematic diagram of the connection between the T-shaped connecting block and the first arc flexible heating sheet and the second arc flexible heating sheet provided in an embodiment of the present application;

[0040] Fig. 9 A schematic diagram of the structure of the telescopic supporting member provided in an embodiment of the present application;

[0041] Fig.10 A schematic diagram of the structure of the mounting member and the temperature sensor provided in the embodiment of the present application.

[0042] In the figure: 1. first arc flexible heating plate; 2. first adsorption member; 3. second arc flexible heating plate; 4. second adsorption member; 5. telescopic abutment member; 500. threaded rod; 501. rotating disk; 502. abutment seat; 6. temperature sensor; 7. heating tube; 8. power supply device; 9. T-shaped connecting block; 10. connecting guide rail; 11. terminal head; 12. mounting member; 1200. support rod; 1201. arc ring. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] The embodiments of the present application provide a magnetic auxiliary heating device and a welding method for power supply cable welding, so as to solve the problems of uneven heating and inconvenient disassembly of the welding auxiliary preheating device in the related art.

[0045] See also Figure 1-Figure 10 A magnetic auxiliary heating device for power cable welding includes: a first arc flexible heating sheet 1, a first adsorption member 2, a second arc flexible heating sheet 3, a second adsorption member 4 and a telescopic supporting member 5.

[0046] A first arc-shaped flexible heating sheet 1, the outer side of which is correspondingly connected to a first adsorption member 2;

[0047] The second arc flexible heating sheet 3 is arranged opposite to the first arc flexible heating sheet 1 to enclose a space for accommodating the parts to be welded; the outer side of the second arc flexible heating sheet 3 is correspondingly connected to the second adsorption member 4; the upper and lower ends of the second adsorption member 4 are connected to the upper and lower ends of the first adsorption member 2 by magnetic adsorption;

[0048] The telescopic supporting member 5 is installed on the first adsorption member 2 and the second adsorption member 4, one end of the telescopic supporting member 5 is connected to the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3, and the other end is passed through the first adsorption member 2 or the second adsorption member 4; when it is necessary to deal with welding parts of different sizes, the telescopic supporting member 5 is extended or contracted to change the shape of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 to adjust the accommodating space.

[0049] Through the above settings, when heat conduction is required, the welds of the two welded parts to be welded are butt-jointed; then the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are contacted with the welded part, and then the second adsorption part 4 is adsorbed and connected with the first adsorption part 2, so that the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 surround the welded part, and the device is fixed on the welded part; after repeating the above steps to install another device on the welded part, the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are energized for preheating, thereby utilizing magnetic adsorption to facilitate installation and disassembly.

[0050] In addition, when it is necessary to adapt to welding parts of different sizes, the length of the telescopic supporting member is adjusted to change the shapes of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 so that the welding parts can be heated evenly.

[0051] refer to Figure 4-Figure 8 In some preferred embodiments, the specific structures of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 have the following specific settings:

[0052] The first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 both include a flexible arc metal sheet and a plurality of heating tubes 7; the plurality of heating tubes 7 are distributed along the length direction of the flexible arc metal sheet, and the flexible arc metal sheet is penetrated along the width direction of the flexible arc metal sheet; the heating tube 7 is externally connected to a power supply device 8; the flexible arc metal sheet covers the heating tube 7 for protection, and has a heat-conducting function, and can also change according to the force.

[0053] The first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 both include a T-shaped connecting block 9, which is arranged along the width direction of the flexible arc metal sheet; the first adsorbent 2 and the second adsorbent 4 are both provided with a connecting rail 10, and the connecting rail 10 is provided with a slide groove, and the T-shaped connecting block 9 can be movably arranged in the slide groove; the first adsorbent 2 or the second adsorbent 4 is provided with a fixing block for fixing with external equipment. The setting of the slide groove and the T-shaped connecting block 9 can facilitate the installation of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3, and facilitate maintenance and replacement.

[0054] In some preferred embodiments, the structural arrangement of the first adsorption member 2 and the second adsorption member 4 may be referred to as follows:

[0055] The first one, reference Figure 4 The first adsorption member 2 is a steel metal arc block; the second adsorption member 4 is an electromagnet arc block, and a terminal 11 is provided on the electromagnet arc block.

[0056] The second one, reference Figure 5The first adsorption member 2 and the second adsorption member 4 both include an aluminum arc block and a bar electromagnet; the upper and lower ends of the aluminum arc block are connected to the bar electromagnet, and the bar electromagnet is provided with a terminal 11; when connection is required, the magnetic properties of the bar electromagnets of the first adsorption member 2 and the second adsorption member 4 are opposite; when disassembly is required, the magnetic properties of the bar electromagnets of the first adsorption member 2 and the second adsorption member 4 are the same. Thus, the above structure is used to achieve connection or disconnection by using the magnetic force generated by the electromagnet, avoiding the structural complexity caused by using other locking devices, making the device easy to fix on the welded part.

[0057] In some preferred embodiments, reference Fig. 9 , how to change the shapes of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3, adjust the accommodating space, and set the structure of the telescopic supporting member 5:

[0058] The telescopic supporting member 5 includes a threaded rod 500, a rotating disk 501 and a supporting seat 502; threaded holes are provided on the first adsorption member 2 and the second adsorption member 4, the threaded rod 500 is installed in the threaded hole, and one end is rotatably connected to the supporting seat 502, and the other end is fixedly connected to the rotating disk 501; the shape of the supporting surface of the supporting seat 502 is the same as that of the first arc flexible heating plate 1 and the second arc flexible heating plate 3.

[0059] When the shapes of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 need to be changed, the rotating disk 501 is rotated to displace the threaded rod 500 and move the abutting seat 502 , thereby achieving the purpose of changing the shapes.

[0060] In some preferred embodiments, in order to facilitate the reminder that the temperature has been heated to the set temperature value, the following settings are made:

[0061] The first adsorbent 2 or the second adsorbent 4 is provided with a mounting member 12, and the mounting member 12 is provided with a temperature sensor 6; the mounting member 12 includes a support rod 1200 and an arc ring 1201, and the arc ring 1201 is provided with a temperature sensor 6 arranged along its length, and the arc ring 1201 is made of high temperature resistant plastic. The mounting member 12 is provided with a sound alarm device, which is used to emit a warning sound when the detection value of the temperature sensor 6 reaches a set value.

[0062] Through the above settings, personnel can be reminded that the heating temperature has been reached, because the preheating temperatures of different metals are different, thereby enhancing the welding effect.

[0063] The present application also proposes a power supply cable welding method, which comprises the following steps:

[0064] Step 1: providing at least two of the above-mentioned magnetic suction auxiliary heating devices for power cable welding;

[0065] Step 2: Butt the welds of the two welded parts to be welded;

[0066] Step 3: The first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are brought into contact with the welding piece, and then the second adsorption piece 4 is adsorbed and connected with the first adsorption piece 2, so that the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 surround the welding piece, and the device is fixed on the welding piece;

[0067] Step 4: After repeating the above steps to install another device on the welding piece, the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are powered on for preheating.

[0068] Through the above method, when heat conduction is required, the welds of the two welded parts to be welded are butt-jointed; then the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are contacted with the welded part, and then the second adsorption part 4 is adsorbed and connected with the first adsorption part 2, so that the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 surround the welded part, and the device is fixed on the welded part; after repeating the above steps to install another device on the welded part, the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are powered on for preheating, thereby utilizing magnetic adsorption to facilitate installation and disassembly.

[0069] In addition, when it is necessary to adapt to welding parts of different sizes, the length of the telescopic supporting member is adjusted to change the shapes of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 so that the welding parts can be heated evenly.

[0070] It should be understood that the above method is an operation that can be performed when the welding part has been fixed. Of course, it is also applicable to the step of placing the welding part on the first adsorption part 2 or the second adsorption part 4 after the first adsorption part 2 or the second adsorption part 4 is fixed. The method of use can be selected according to needs.

[0071] Principles of this application:

[0072] (1) When heat conduction is required, the welds of the two welded parts to be welded are butt-jointed; then the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are brought into contact with the welded parts, and then the second adsorption member 4 is adsorbed and connected with the first adsorption member 2, so that the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 surround the welded parts, and the device is fixed on the welded parts; after repeating the above steps to install another device on the welded parts, the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 are powered on for preheating, so as to achieve the purpose of facilitating installation and disassembly by magnetic adsorption.

[0073] In addition, when it is necessary to adapt to welding parts of different sizes, the length of the telescopic supporting member is adjusted to change the shapes of the first arc flexible heating sheet 1 and the second arc flexible heating sheet 3 so that the welding parts can be heated evenly.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A magnetic auxiliary heating device for power cable welding, characterized in that: It includes: A first arc-shaped flexible heating sheet (1), the outer side of which is correspondingly connected to a first adsorption member (2); A second circular arc flexible heating sheet (3) arranged opposite to the first circular arc flexible heating sheet (1) to enclose a space for accommodating the parts to be welded; The outer side of the second arc flexible heating sheet (3) is correspondingly connected to a second adsorption member (4); the upper and lower ends of the second adsorption member (4) are connected to the upper and lower ends of the first adsorption member (2) by magnetic adsorption; a telescopic supporting member (5) mounted on the first adsorption member (2) and the second adsorption member (4); one end of the telescopic supporting member (5) is connected to the first arc flexible heating sheet (1) and the second arc flexible heating sheet (3); and the other end of the telescopic supporting member (5) is passed through the first adsorption member (2) or the second adsorption member (4); When it is necessary to deal with welding parts of different sizes, the telescopic supporting member (5) is extended or contracted to change the shapes of the first circular arc flexible heating sheet (1) and the second circular arc flexible heating sheet (3) and adjust the accommodation space.

2. The magnetic suction auxiliary heating device for power cable welding according to claim 1, characterized in that: The first circular arc flexible heating sheet (1) and the second circular arc flexible heating sheet (3) both comprise a flexible circular arc metal sheet and a plurality of heating tubes (7); the plurality of heating tubes (7) are distributed along the length direction of the flexible circular arc metal sheet, and are arranged through the flexible circular arc metal sheet along the width direction of the flexible circular arc metal sheet; the heating tubes (7) are externally connected to a power supply device (8).

3. The magnetic suction auxiliary heating device for power cable welding according to claim 2, characterized in that: The first arc-shaped flexible heating sheet (1) and the second arc-shaped flexible heating sheet (3) both further include a T-shaped connecting block (9), and the T-shaped connecting block (9) is arranged along the width direction of the flexible arc-shaped metal sheet; The first adsorption component (2) and the second adsorption component (4) are both provided with a connecting rail (10), the connecting rail (10) is provided with a slide groove, and the T-shaped connecting block (9) is movably arranged in the slide groove; the first adsorption component (2) or the second adsorption component (4) is provided with a fixing block for fixing to an external device.

4. The magnetic suction auxiliary heating device for power cable welding according to claim 1, characterized in that: The first adsorption member (2) is a steel metal arc block; the second adsorption member (4) is an electromagnet arc block, and a terminal (11) is provided on the electromagnet arc block.

5. The magnetic suction auxiliary heating device for power cable welding according to claim 1, characterized in that: The first adsorption member (2) and the second adsorption member (4) both comprise an aluminum arc block and a bar-shaped electromagnet; the upper and lower ends of the aluminum arc block are connected to the bar-shaped electromagnet, and the bar-shaped electromagnet is provided with a terminal (11); when connection is required, the magnetic properties of the bar-shaped electromagnets of the first adsorption member (2) and the second adsorption member (4) are opposite; when disassembly is required, the magnetic properties of the bar-shaped electromagnets of the first adsorption member (2) and the second adsorption member (4) are the same.

6. The magnetic suction auxiliary heating device for power cable welding according to claim 1, characterized in that: The telescopic supporting member (5) comprises a threaded rod (500), a rotating disk (501) and a supporting seat (502); The first adsorption member (2) and the second adsorption member (4) are both provided with threaded holes, the threaded rod (500) is installed in the threaded hole, one end of the threaded rod is rotatably connected to the abutment seat (502), and the other end is fixedly connected to the rotating disk (501); the shape of the abutment surface of the abutment seat (502) is the same as that of the first circular arc flexible heating plate (1) and the second circular arc flexible heating plate (3).

7. The magnetic suction auxiliary heating device for power cable welding according to claim 1, characterized in that: A mounting member (12) is provided on the first adsorption member (2) or the second adsorption member (4), and a temperature sensor (6) is provided on the mounting member (12).

8. The magnetic suction auxiliary heating device for power cable welding according to claim 7, characterized in that: The mounting member (12) comprises a support rod (1200) and an arc ring (1201), the temperature sensor (6) being arranged along the length of the arc ring (1201), and the arc ring (1201) is made of high temperature resistant plastic.

9. The magnetic suction auxiliary heating device for power cable welding according to claim 7, characterized in that: The mounting member (12) is provided with a sound alarm device, which is used to emit a warning sound after the detection value of the temperature sensor (6) reaches a set value.

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