CN211478409U

CN211478409U - Remote control guide rail type installation three-phase electric energy meter based on GPRS communication

Info

Publication number: CN211478409U
Application number: CN201921837173.3U
Authority: CN
Inventors: 张舜
Original assignee: Hangzhou Donglong Electronic Technology Co ltd
Current assignee: Hangzhou Donglong Electronic Technology Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-09-11
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses a remote control guide tracked installation three-phase electric energy meter based on GPRS communication, including device body, wiring end, MCU microprocessor, articulated shaft and wireless transceiver, the top of device body is equipped with the wiring end, and the inside of wiring end is equipped with the wiring end to the device body top of wiring end one side is equipped with MCU microprocessor, the inside AD converter that is equipped with of device body of MCU microprocessor below, and the inside GPRS module that is equipped with of device body of AD converter one side to the below of GPRS module is equipped with the amplifier, the bottom of amplifier is equipped with the wave filter, and one side of wave filter is equipped with the control electric brake to device body bottom below control electric brake is equipped with the wiring mechanism, be equipped with wireless transceiver on the device body inner wall of GPRS module top, the inside of wiring end is equipped with three. The utility model discloses not only realized three-phase electric energy meter from verifying the device, three-phase electric energy meter fast clamp presss from both sides tight installation fixed.

Description

Remote control guide rail type installation three-phase electric energy meter based on GPRS communication

Technical Field

The utility model relates to an installation three-phase electric energy meter technical field specifically is remote control guide tracked installation three-phase electric energy meter based on the GPRS communication.

Background

The electric energy meter is an instrument for measuring electric energy, along with the rapid development of the economy of China, the demand on electricity is also getting bigger and bigger, in order to improve the unbalanced electricity consumption, advocate the power saving, improve the electricity consumption efficiency of the whole country, a remote control guide rail type three-phase electric energy meter based on GPRS communication is developed, in order to ensure the accuracy when being installed, the existing electric energy meter needs to be measured and detected, and the existing three-phase electric energy meter still has some deficiencies to be improved.

The three-phase electric energy meter in the market is various and can basically meet the use requirements of people, but certain problems still exist, and the specific problems include the following points:

(1) the existing three-phase electric energy meter is generally not provided with an electric energy meter self-checking device when in use, thereby seriously influencing the accuracy of the three-phase electric energy meter when in use;

(2) the existing three-phase electric energy meter is not convenient to clamp, install and fix quickly when in use, thereby greatly influencing the efficiency of the three-phase electric energy meter when in use;

(3) the existing three-phase electric energy meter is generally not provided with safety protection measures when in use, thereby bringing great trouble to people.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a remote control guide tracked installation three-phase electric energy meter based on GPRS communication to it is fixed not convenient for the quick clamp to press from both sides tight installation to propose the installation three-phase electric energy meter in solving above-mentioned background art, is not equipped with the electric energy meter from verifying the device, does not generally be equipped with safety protection measure's problem.

In order to achieve the above object, the utility model provides a following technical scheme: remote control guide tracked installation three-phase electric energy meter based on GPRS communication, including device body, wiring end, MCU microprocessor, articulated shaft and wireless transceiver, its characterized in that: the top of the device body is provided with a wiring end, the inside of the wiring end is provided with the wiring end, the top of the device body on one side of the wiring end is provided with an MCU microprocessor, the inside of the device body below the MCU microprocessor is provided with an AD converter, the inside of the device body on one side of the AD converter is provided with a GPRS module, the lower part of the GPRS module is provided with an amplifier, the bottom end of the amplifier is provided with a filter, one side of the filter is provided with a control electric brake, the bottom of the device body below the control electric brake is provided with a wiring mechanism, the outer wall of the device body on one side of the wiring mechanism is provided with a protective groove, one side of the protective groove is provided with a protective cover, the inside of the protective cover is provided with a positive contact, one end of the protective cover, close to the positive contact, and one side that the device body outer wall is close to little processing module is equipped with clamping mechanism, one side of device body is equipped with the switch board, and one side that the switch board is close to the device body is equipped with the guide rail platform to one side that the device body is close to the guide rail platform is equipped with the guide slot, the inside fixed establishment that is equipped with of device body of guide slot below, and the inside electric energy metering module that is equipped with of device body of fixed establishment below, be equipped with wireless transceiver on the device body inner wall of GPRS module top, the inside of wiring end is equipped with three phase current.

Preferably, the inside of fixed establishment has set gradually standing groove, compression spring, telescopic link, fixed block, limit baffle, stopper and has placed the frame, the inside frame of placing that is equipped with of device body of switch board one side, and the inside of placing the frame is equipped with the standing groove to the inside of standing groove is equipped with the telescopic link, the surface cover of telescopic link is equipped with limit baffle, and one side of limit baffle is equipped with the stopper, the one end of telescopic link is equipped with compression spring, and the one end that compression spring was kept away from to the telescopic link is equipped with the fixed block.

Preferably, the inside of the clamping mechanism is sequentially provided with a bevel, a first limit sleeve, a support plate, a first support spring, a second limit sleeve, a second support spring, a third limit sleeve and a through groove, the outer wall of the device body below the guide rail table is provided with the bevel, the bevel inside is provided with the first support spring, and the bottom end of the first support spring is provided with the second limit sleeve.

Preferably, a second supporting spring is arranged below the second limiting sleeve, a third limiting sleeve is arranged at the bottom end of the second supporting spring, a through groove is formed in the beveling portion below the third limiting sleeve, a supporting plate is arranged in the beveling portion above the first supporting spring, and a first limiting sleeve is sleeved on the beveling surface above the supporting plate.

Preferably, the inside of wiring mechanism has set gradually first clamp tight piece, power cord, external screw thread, internal thread, atress groove, atress board and nut, the one end that device body bottom is close to microprocessor module is equipped with the atress board, and the inside of atress board is equipped with the atress groove to the inside in atress groove is equipped with the internal thread.

Preferably, one side of atress board is equipped with the power cord, and one side of power cord is equipped with first tight piece of clamp to the inside of first tight piece of clamp is equipped with the nut, the surface of nut is equipped with the external screw thread, and external screw thread and internal thread mutually support.

Compared with the prior art, the beneficial effects of the utility model are that: the GPRS communication-based remote control guide rail type installation three-phase electric energy meter realizes a self-checking device of the three-phase electric energy meter, and the three-phase electric energy meter is quickly clamped, installed and fixed;

(1) through the arrangement of the beveling, the first limiting sleeve, the support plate, the first supporting spring, the second limiting sleeve, the second supporting spring, the third limiting sleeve and the through groove, the beveling is retracted into the interior of the first limiting sleeve by pulling the through groove, the first supporting spring is under the assistance of the support plate and the second limiting sleeve, and the second supporting spring is under the assistance of the second limiting sleeve and the through groove, elastic contraction is completed, a guide rail table above a power distribution cabinet is inserted into the guide groove, clamping work on the three-phase electric energy meter is completed, the telescopic rod is subjected to telescopic motion under the limiting of the limiting block and the limiting baffle through the compression spring, the fixing block is subjected to elastic compression, the power distribution cabinet is further fixed through the fixing block, the three-phase electric energy meter is rapidly clamped, installed and fixed, the reliability of the three-phase electric energy meter is improved, and the safety of the three-phase electric;

(2) the power line clamping device is provided with the first clamping block, the power line, the external thread, the internal thread, the stress groove, the stress plate and the nut, the nut is rotated, the first clamping block and the external thread are matched with the external thread and the internal thread to clamp the power line, the first clamping block and the external thread are fixed inside the stress groove on one side of the stress plate, the protective cover is rotated under the hinge joint of the hinge shaft, and positive contact and negative contact are in on-off contact to control the on and off of a switch, so that the protection work of a circuit is completed, the multi-surface contact of a wiring terminal of the three-phase electric energy meter is realized to reduce resistance, and the self-power-off protection work of opening the cover is realized;

(3) this detection device is connected with electric energy metering module through being provided with, control the magnification through MCU microprocessor and AD converter electric current size on the electric energy metering module respectively, and amplify through the amplifier, the signal after the amplification is filtered through the wave filter, carry out analog-to-digital conversion with signal transmission to AD converter, and return MCU microprocessor with the signal again, MCU microprocessor sends the testing result to the GPRS module at last, measure the testing result and draw the electric energy metering map with this data through the GPRS module, if when the electric energy measurement testing result lasts and surpasss the threshold value, judge that this electric energy meter metering is unusual, three-phase electric energy meter self-validation device has been realized, accurately accomplish the inspection operation.

Drawings

Fig. 1 is a schematic front view of a cross-sectional structure of the present invention;

FIG. 2 is a schematic view of the fixing mechanism of the present invention in cross-section and enlarged structure;

FIG. 3 is a schematic view of a cross-sectional enlarged structure of the clamping mechanism of the present invention;

FIG. 4 is a schematic view of the connection mechanism of the present invention in cross-section and enlarged structure;

fig. 5 is a schematic diagram of the system framework structure of the present invention.

In the figure: 1. a device body; 2. a terminal; 3. an MCU microprocessor; 4. an AD converter; 5. a guide groove; 6. a power distribution cabinet; 7. a rail table; 8. a fixing mechanism; 801. a placement groove; 802. a compression spring; 803. a telescopic rod; 804. a fixed block; 805. a limit baffle; 806. a limiting block; 807. placing the frame; 9. An electric energy metering module; 10. a clamping mechanism; 1001. beveling; 1002. a first stop collar; 1003. a support plate; 1004. a first support spring; 1005. a second stop collar; 1006. a second support spring; 1007. a third stop collar; 1008. a through groove; 11. a microprocessor module; 12. a wiring mechanism; 1201. a first clamping block; 1202. a power line; 1203. an external thread; 1204. an internal thread; 1205. a stress groove; 1206. a stress plate; 1207. a nut; 13. controlling the electric brake; 14. a protective bath; 15. a protective cover; 16. positive contact; 17. hinging a shaft; 18. negative contact; 19. a filter; 20. an amplifier; 21. a GPRS module; 22. A three-phase power supply; 23. a wireless transceiver.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides an embodiment: a GPRS communication-based remote control guide rail type installation three-phase electric energy meter comprises a device body 1, a wiring terminal 2, an MCU microprocessor 3, a hinge shaft 17 and a wireless transceiver 23, wherein the wiring terminal 2 is arranged at the top of the device body 1, the wiring terminal 2 is arranged inside the wiring terminal 2, the MCU microprocessor 3 is arranged at the top of the device body 1 on one side of the wiring terminal 2, the type of the MCU microprocessor 3 is MC68000, the output end of the MCU microprocessor 3 is electrically connected with the input end of a GPRS module 21, an AD converter 4 is arranged inside the device body 1 below the MCU microprocessor 3, the type of the AD converter 4 is XC9111C501M, the output end of the AD converter 4 is electrically connected with the input end of the MCU microprocessor 3, a GPRS module 21 is arranged inside the device body 1 on one side of the AD converter 4, the type of the GPRS module 21 is USR-GM3, and an amplifier, the amplifier 20 is LM324, the bottom end of the amplifier 20 is provided with a filter 19, the filter 19 is TCM2016-B01, the output end of the filter 19 is electrically connected with the input end of the AD converter 4, one side of the filter 19 is provided with a control switch 13, the control switch 13 is SDL-U2065A-12, and the bottom of the device body 1 below the control switch 13 is provided with a wiring mechanism 12;

a first clamping block 1201, a power line 1202, external threads 1203, internal threads 1204, a stress groove 1205, a stress plate 1206 and a nut 1207 are sequentially arranged inside the wiring mechanism 12, the stress plate 1206 is arranged at one end, close to the micro-processing module 11, of the bottom of the device body 1, the stress groove 1205 is arranged inside the stress plate 1206, the internal threads 1204 are arranged inside the stress groove 1205, the power line 1202 is arranged on one side of the stress plate 1206, the first clamping block 1201 is arranged on one side of the power line 1202, the nut 1207 is arranged inside the first clamping block 1201, the external threads 1203 are arranged on the surface of the nut 1207, and the external threads 1203 are matched with the internal threads 1204;

when the three-phase electric energy meter is used, the first clamping block 1201 and the external thread 1203 are matched through rotating the nut 1207 to clamp the power line 1202, the first clamping block and the external thread 1203 are fixed inside the stress groove 1205 on one side of the stress plate 1206, the protective cover 15 is hinged through the hinge shaft 17 to rotate, the positive contact 16 and the negative contact 18 are in on-off contact, the on-off of the control switch 13 is controlled, the protection work of a circuit is completed, the multi-surface contact of the terminals of the three-phase electric energy meter is realized to reduce resistance, the self-power-off protection work of opening the cover is realized, and the safety of the three-phase electric energy meter is improved;

the outer wall of the device body 1 on one side of the wiring mechanism 12 is provided with a protective groove 14, one side of the protective groove 14 is provided with a protective cover 15, the interior of the protective cover 15 is provided with a positive contact 16, one end, close to the positive contact 16, of the protective cover 15 is provided with a hinge shaft 17, the outer wall of the device body 1 on one side of the hinge shaft 17 is provided with a negative contact 18, one end, close to the wiring mechanism 12, of the bottom of the device body 1 is provided with a micro-processing module 11, the model of the micro-processing module 11 is RCM4400, the output end of the micro-processing module 11 is electrically connected with the input end of the electric energy metering module 9, and one side, close;

a beveling 1001, a first limit sleeve 1002, a support plate 1003, a first support spring 1004, a second limit sleeve 1005, a second support spring 1006, a third limit sleeve 1007 and a through groove 1008 are sequentially arranged in the clamping mechanism 10, the beveling 1001 is arranged on the outer wall of the device body 1 below the guide rail table 7, the first support spring 1004 is arranged in the beveling 1001, the second limit sleeve 1005 is arranged at the bottom end of the first support spring 1004, the second support spring 1006 is arranged below the second limit sleeve 1005, the third limit sleeve 1007 is arranged at the bottom end of the second support spring 1006, the through groove 1008 is arranged in the beveling 1001 below the third limit sleeve 1007, the support plate 1003 is arranged in the beveling 1001 above the first support spring 1004, and the first limit sleeve 1002 is sleeved on the surface of the beveling 1001 above the support plate 1003;

when the three-phase electric energy meter is used, the through groove 1008 is pulled to enable the bevel 1001 to be retracted into the first limiting sleeve 1002, the first supporting spring 1004 is elastically contracted under the assistance of the supporting plate 1003 and the second limiting sleeve 1005, and the second supporting spring 1006 is elastically contracted under the assistance of the second limiting sleeve 1005 and the through groove 1008, the guide rail table 7 above the power distribution cabinet 6 is inserted into the guide groove 5 to clamp the three-phase electric energy meter, the compression spring 802 is used for performing telescopic motion on the telescopic rod 803 under the limitation of the limiting block 806 and the limiting baffle 805 to elastically compress the fixing block 804, and the fixing block 804 is used for further fixing the power distribution cabinet 6, so that the three-phase electric energy meter is quickly clamped, installed and fixed, the reliability of the three-phase electric energy meter is improved, and the safety of the three-phase electric energy meter is;

a power distribution cabinet 6 is arranged on one side of the device body 1, a guide rail table 7 is arranged on one side, close to the device body 1, of the power distribution cabinet 6, a guide groove 5 is arranged on one side, close to the guide rail table 7, of the device body 1, and a fixing mechanism 8 is arranged inside the device body 1 below the guide groove 5;

a placing groove 801, a compression spring 802, an expansion link 803, a fixing block 804, a limiting baffle 805, a limiting block 806 and a placing frame 807 are sequentially arranged in the fixing mechanism 8, the placing frame 807 is arranged in the device body 1 on one side of the power distribution cabinet 6, the placing groove 801 is arranged in the placing frame 807, the expansion link 803 is arranged in the placing groove 801, the limiting baffle 805 is sleeved on the surface of the expansion link 803, the limiting block 806 is arranged on one side of the limiting baffle 805, the compression spring 802 is arranged at one end of the expansion link 803, and the fixing block 804 is arranged at one end, far away from the compression spring 802, of the expansion link 803;

an electric energy metering module 9 is arranged inside the device body 1 below the fixing mechanism 8, the type of the electric energy metering module 9 is DDS-315RS, the output end of the electric energy metering module 9 is electrically connected with the input end of the microprocessing module 11, a wireless transceiver 23 is arranged on the inner wall of the device body 1 above the GPRS module 21, and a three-phase power supply 22 is arranged inside the wiring end 2.

The working principle is as follows: when in use, the external power supply is firstly connected into a three-phase power supply 22 through a terminal 2, a sampling circuit of a control electric brake 13 is used for sampling the current and the voltage used by a power user, a chip of the control electric brake 13 is used for metering the electricity used by the user according to the collected current and the collected voltage, an electric energy metering module 9 is connected with a micro-processing module 11 through a serial peripheral device interface, a GPRS module 21 is connected with the micro-processing module 11, the control electric brake 13 is used for controlling the on-off of power supply, the micro-processing module consists of an MCU system and a clock circuit, the MCU system records the electricity use condition of the user and controls each connected component, a GPRS server is communicated with the three-phase prepayment electric energy meter through the GPRS module 21 and is responsible for remote meter reading, remote control and remote recharging of the three-phase prepayment electric energy meter, and the detection device is connected with the, the amplification factor is controlled by the current on the electric energy metering module 9 of the MCU microprocessor 3 and the AD converter 4 respectively, the amplified signals are amplified by the amplifier 20, the amplified signals are filtered by the filter 19, the signals are transmitted to the AD converter 4 for analog-to-digital conversion, the signals are transmitted back to the MCU microprocessor 3, finally the MCU microprocessor 3 sends the detection result to the GPRS module 21, the detection result is measured by the GPRS module 21, an electric energy metering graph is drawn by the data, if the electric energy metering detection result continuously exceeds a threshold value, the electric energy meter metering is judged to be abnormal, the three-phase electric energy meter self-validation device is realized, the inspection operation is accurately finished, then the first clamping block 1201 and the external thread 1203 are matched by the external thread 1203 and the internal thread 1204 to finish the clamping work of the power wire 1202, and the clamping work is fixed in the stress groove 1205 at one side of the stress plate 1206, the protection cover 15 is hinged by a hinge shaft 17 to rotate, so that a positive contact 16 is in on-off contact with a negative contact 18 to control the on and off of the switch 13, the multi-surface contact of a three-phase electric energy meter terminal is realized to reduce the resistance, the self-power-off protection work of opening the cover is realized, the safety of the three-phase electric energy meter is improved, the beveling 1001 is retracted into the first limiting sleeve 1002 by pulling the through groove 1008, the first supporting spring 1004 is assisted by the supporting plate 1003 and the second limiting sleeve 1005, the second supporting spring 1006 is assisted by the second limiting sleeve 1005 and the through groove 1008 to complete the elastic contraction, the guide rail table 7 above the power distribution cabinet 6 is inserted into the guide groove 5 to complete the clamping work of the three-phase electric energy meter, the telescopic rod 805 is subjected to the telescopic motion under the limiting of the limiting block 806 and the limiting baffle plate by the compression spring 802 to elastically compress the fixing block 804, and the power distribution cabinet 6 is further clamped by the, the reliability of the three-phase electric energy meter is improved, the safety of the three-phase electric energy meter is improved, and the use work of installing the three-phase electric energy meter is completed.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. Remote control guide tracked installation three-phase electric energy meter based on GPRS communication, including device body (1), wiring end (2), MCU microprocessor (3), articulated shaft (17) and wireless transceiver (23), its characterized in that: the device comprises a device body (1), wherein the top of the device body (1) is provided with a wiring terminal (2), the inside of the wiring terminal (2) is provided with the wiring terminal (2), the top of the device body (1) on one side of the wiring terminal (2) is provided with an MCU (microprogrammed control unit) (3), the inside of the device body (1) below the MCU (microprogrammed control unit) (3) is provided with an AD converter (4), the inside of the device body (1) on one side of the AD converter (4) is provided with a GPRS (general packet radio service) module (21), an amplifier (20) is arranged below the GPRS (21), the bottom end of the amplifier (20) is provided with a filter (19), one side of the filter (19) is provided with a control electric brake (13), the bottom of the device body (1) below the control electric brake (13) is provided with a wiring mechanism (12), the outer wall of, and the inside of the protective cover (15) is provided with a positive contact (16), one end of the protective cover (15) close to the positive contact (16) is provided with a hinged shaft (17), the outer wall of the device body (1) on one side of the hinged shaft (17) is provided with a negative contact (18), one end of the bottom of the device body (1) close to the wiring mechanism (12) is provided with a micro-processing module (11), one side of the outer wall of the device body (1) close to the micro-processing module (11) is provided with a clamping mechanism (10), one side of the device body (1) is provided with a power distribution cabinet (6), one side of the power distribution cabinet (6) close to the device body (1) is provided with a guide rail table (7), one side of the device body (1) close to the guide rail table (7) is provided with a guide groove (5), the inside of the device body (1) below the guide groove (5) is provided with a fixing mechanism (, be equipped with wireless transceiver (23) on the device body (1) inner wall of GPRS module (21) top, the inside of wiring end (2) is equipped with three phase current source (22).

2. The GPRS communication based remote control guide rail type mounting three-phase electric energy meter according to claim 1, wherein: the inside of fixed establishment (8) has set gradually standing groove (801), compression spring (802), telescopic link (803), fixed block (804), limit baffle (805), stopper (806) and has placed frame (807), the inside of device body (1) of switch board (6) one side is equipped with places frame (807), and the inside of placing frame (807) is equipped with standing groove (801), and the inside of standing groove (801) is equipped with telescopic link (803), the surface cover of telescopic link (803) is equipped with limit baffle (805), and one side of limit baffle (805) is equipped with stopper (806), the one end of telescopic link (803) is equipped with compression spring (802), and the one end that compression spring (802) were kept away from to telescopic link (803) is equipped with fixed block (804).

3. The GPRS communication based remote control guide rail type mounting three-phase electric energy meter according to claim 1, wherein: the device is characterized in that a beveling (1001), a first limiting sleeve (1002), a support plate (1003), a first supporting spring (1004), a second limiting sleeve (1005), a second supporting spring (1006), a third limiting sleeve (1007) and a through groove (1008) are sequentially arranged in the clamping mechanism (10), the beveling (1001) is arranged on the outer wall of the device body (1) below the guide rail table (7), the first supporting spring (1004) is arranged in the beveling (1001), and the second limiting sleeve (1005) is arranged at the bottom end of the first supporting spring (1004).

4. The GPRS communication based remote control rail-mounted three-phase electric energy meter according to claim 3, wherein: a second supporting spring (1006) is arranged below the second limiting sleeve (1005), a third limiting sleeve (1007) is arranged at the bottom end of the second supporting spring (1006), a through groove (1008) is formed in the beveling (1001) below the third limiting sleeve (1007), a supporting plate (1003) is arranged inside the beveling (1001) above the first supporting spring (1004), and a first limiting sleeve (1002) is sleeved on the surface of the beveling (1001) above the supporting plate (1003).

5. The GPRS communication based remote control guide rail type mounting three-phase electric energy meter according to claim 1, wherein: the inside of wiring mechanism (12) has set gradually first clamp piece (1201), power cord (1202), external screw thread (1203), internal thread (1204), atress groove (1205), atress board (1206) and nut (1207), the one end that device body (1) bottom is close to microprocessor module (11) is equipped with atress board (1206), and the inside of atress board (1206) is equipped with atress groove (1205) to the inside of atress groove (1205) is equipped with internal thread (1204).

6. The GPRS communication based remote control rail-mounted three-phase electric energy meter according to claim 5, wherein: one side of the stress plate (1206) is provided with a power line (1202), one side of the power line (1202) is provided with a first clamping block (1201), a nut (1207) is arranged inside the first clamping block (1201), an external thread (1203) is arranged on the surface of the nut (1207), and the external thread (1203) is matched with the internal thread (1204).