Control instrument for detecting strength of sand

Abstract

The application provides a control instrument for detecting the strength of molding sand and relates to the field of molding sand detection. The control instrument for detecting the strength of molding sand comprises a base, the inside of the base is divided into an airflow control cavity and a heat dissipation cavity by a partition plate, an air outlet channel is installed on the front side of the right end of the base, an air outlet groove is fixedly connected to the side of the airflow control cavity close to the air outlet channel, the inside of the air outlet groove is in communication with the air outlet channel, a piezoelectric valve is installed above the airflow control cavity, and a strength pressure transmitter is installed above the heat dissipation cavity. The piezoelectric valve and the airflow control cavity are added to the inside, the airflow control of the piezoelectric valve is more convenient, the operation stability is improved, when the test is stable, the piezoelectric valve can be closed and the control valve can be opened, the airflow directly enters the air outlet groove from the air inlet groove and is discharged, the consumption of compressed air can be greatly reduced, the energy consumption is reduced, and the operation cost of enterprises is reduced.

Description

Control instruments for detecting molding sand strength Technical Field

[0001] This invention relates to the field of molding sand testing, specifically to a control instrument for testing the strength of molding sand. Background Technology

[0002] Molding sand can be divided into face sand, filler sand, and others. Face sand is a layer of molding sand that adheres tightly to the casting and has high quality requirements. Filler sand is placed after the face sand layer and does not come into contact with the molten metal. Its quality requirements are not strict. Single sand is molding sand that does not distinguish between face sand and back sand and is mainly used for machine molding. Other types of sand molds often need to be dried before pouring. The molding sand used in these molds contains more clay and is called dry molding sand. Small and medium-sized castings often use wet molding sand, which contains less clay and is called wet molding sand.

[0003] To ensure the quality of molding sand, six important indicators are typically tested, with hardness testing being an indispensable step. Hardness testing usually involves using an electrically controlled air hammer to continuously hammer the sand, followed by data acquisition and observation using a strength and pressure transmitter. However, controlling the air hammer typically relies on a control instrument to control the air path of a solenoid valve, thus controlling the hammer's movement. This cannot guarantee the stability of airflow control. Furthermore, during continuous hammering, the controller continuously compresses the gas, consuming significant energy and increasing testing costs. Finally, during continuous operation, there are also issues such as poor heat dissipation within the instrument and the tendency for wiring connections to loosen. These problems need to be addressed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a control instrument for detecting the strength of molding sand, which solves the problems of unstable airflow control, high energy consumption during continuous gas compression, poor heat dissipation inside the instrument, and easy loosening of wiring terminals.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a control instrument for detecting the strength of molding sand, comprising a base, an upper shell mounted on the top of the base by bolts, the interior of the base being divided into an airflow control chamber and a heat dissipation chamber by a partition plate on one side, an air inlet channel mounted on the rear right side of the base, and an air outlet channel mounted on the front right side of the base, an air inlet groove fixedly connected to the side of the airflow control chamber near the air inlet channel and the interior of the air inlet groove communicating with the air inlet channel, an air outlet groove fixedly connected to the side of the airflow control chamber near the air outlet channel and the interior of the air outlet groove communicating with the air outlet channel, a piezoelectric valve mounted above the airflow control chamber, and a strength pressure transmitter mounted above the heat dissipation chamber.

[0006] Preferably, air pipe locking rings are installed on the outer diameter of both the air inlet channel and the air outlet channel, a terminal block is installed in the middle of the left end of the base, and bent magnetic plates are movably connected to the upper and lower sides of the left end of the base, with several wire grooves provided on the inner end of each bent magnetic plate.

[0007] Preferably, the airflow control cavity is further fixedly connected to an exhaust groove, the exhaust groove is connected to the outside through an exhaust pipe, and a muffler is installed at the end of the exhaust pipe.

[0008] Preferably, both the air inlet channel and the air outlet channel are equipped with air pressure sensors on their outer diameters inside the airflow control chamber, and two air pressure gauges are provided at the middle of the right end of the base, with the air pressure sensors on the corresponding sides of the air pressure gauges electrically connected.

[0009] Preferably, a telescopic cylinder is installed on one end of the partition plate near the air intake slot, and the drive end of the telescopic cylinder extends through into the interior of the air intake slot and is fitted with a rubber plug.

[0010] Preferably, the middle of the end of the air inlet slot near the air outlet slot is connected to the interior of the air outlet slot via a connecting pipe, and a control valve is installed on the outer diameter of the connecting pipe.

[0011] Preferably, the air inlet end of the piezoelectric valve is connected to the inside of the air inlet groove, the air outlet end of the piezoelectric valve is connected to the inside of the air outlet groove, the air outlet end of the piezoelectric valve is connected to the inside of the air outlet groove, and a control panel is installed on one side of the front end of the base, and the control panel is electrically connected to the pressure transmitter and the piezoelectric valve.

[0012] Preferably, a hollow disk is installed inside the heat dissipation cavity, and one side of the middle part of the air intake channel passes through the outer wall of the base through an airflow branch pipe and is connected to the interior of the hollow disk. Several Venturi tubes are welded to the upper surface of the hollow disk, and the bottom ends of the Venturi tubes are all connected to the interior of the hollow disk.

[0013] Preferably, a mounting bracket is installed on the upper side of the heat dissipation cavity, a grid plate is provided in the middle of the mounting bracket, and heat dissipation windows are provided on both sides of the upper surface of the base.

[0014] Working Principle: First, the air inlet and outlet channels are connected to the air inlet and outlet pipes respectively. The pipes are locked using the air pipe locking ring. The connector is inserted into the terminal block. The two bent magnetic plates are joined together, and the magnetic attraction between the plates stabilizes the connecting wires. Then, the instrument can be turned on to start the strength test of molding sand. The gas enters the piezoelectric valve through the air inlet slot, is compressed, and then exits through the air outlet slot. It is then discharged through the air outlet channel and finally discharged into the solenoid valve used to control the movement of the air hammer, thus controlling the air hammer. During the test, the air pressure is observed through the air pressure sensor and the air pressure gauge. When the air pressure tends to stabilize, the piezoelectric valve can be closed and the control valve can be opened, allowing the airflow to directly enter the air outlet slot from the air inlet slot and then exit. This can greatly reduce the consumption of compressed air, reduce energy consumption, and reduce the operating costs of enterprises. During operation, a portion of the airflow is introduced into the hollow disc through the airflow branch pipe and then ejected through the Venturi tube. The Venturi effect is used to make the ejected gas flow fast and the temperature low, which can better dissipate heat from the instrument and extend the service life of the device.

[0015] This invention provides a control instrument for detecting the strength of molding sand. It has the following beneficial effects:

[0016] 1. This invention adds a piezoelectric valve and an airflow control chamber inside the instrument, which makes it easier to control the airflow of the piezoelectric valve and improves the stability of operation. Secondly, when the test is stable, the piezoelectric valve can be closed and the control valve can be opened, so that the airflow can directly enter the air outlet from the air inlet slot and then be discharged. This can greatly reduce the consumption of compressed air, reduce energy consumption, and reduce the operating costs of enterprises.

[0017] 2. This invention adds a heat dissipation cavity to the bottom of the pressure transmitter and uses an airflow branch pipe to introduce a portion of the airflow into the hollow disk before it is ejected through the Venturi tube. The Venturi effect is used to make the ejected gas flow rate fast and the temperature low, which can better dissipate heat from the instrument. At the same time, adding air pipe locking rings to the inlet and outlet air pipes and adding bent magnetic plates to both sides of the terminal block can increase the firmness of the air pipe and wire connection, prevent the pipeline from loosening, and better meet the usage requirements. Attached Figure Description

[0018] Figure 1 is a perspective view of the present invention;

[0019] Figure 2 is a schematic diagram of the internal structure of the base of the present invention;

[0020] Figure 3 is an enlarged view of point A in Figure 2;

[0021] Figure 4 is a frontal internal view of the present invention;

[0022] Figure 5 is a side-view perspective of the present invention.

[0023] The components include: 1. Base; 2. Upper shell; 3. Divider plate; 4. Airflow control chamber; 5. Heat dissipation chamber; 6. Air inlet channel; 7. Air outlet channel; 8. Air pipe locking ring; 9. Air inlet slot; 10. Air outlet slot; 11. Exhaust slot; 12. Silencer; 13. Air pressure sensor; 14. Telescopic cylinder; 15. Rubber plug; 16. Connecting pipe; 17. Control valve; 18. Hollow disc; 19. Airflow branch pipe; 20. Venturi tube; 21. Mounting bracket; 22. Grid plate; 23. Air pressure gauge; 24. Heat dissipation window; 25. Control panel; 26. Strength pressure transmitter; 27. Piezoelectric valve; 28. Terminal block; 29. ​​Bending magnetic plate; 30. Cable tray. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example:

[0026] As shown in Figures 1-5, this embodiment of the invention provides a control instrument for detecting the strength of molding sand, including a base 1. A top shell 2 is bolted to the top of the base 1. One side of the base 1 is divided into an airflow control chamber 4 and a heat dissipation chamber 5 by a partition plate 3, used for airflow control and internal heat dissipation respectively. An air inlet channel 6 is installed on the rear right side of the base 1 for connecting to an air inlet pipe. An air outlet channel 7 is installed on the front right side of the base 1 for connecting to an air outlet pipe and to a solenoid valve controlling the movement of the air hammer. An air inlet groove 9 is fixedly connected to the side of the airflow control chamber 4 near the air inlet channel 6, and the interior of the air inlet groove 9 communicates with the air inlet channel 6. An air outlet groove 10 is fixedly connected to the side of the airflow control chamber 4 near the air outlet channel 7, and the interior of the air outlet groove 10 communicates with the air outlet channel 7. A piezoelectric valve 27 is installed above the airflow control chamber 4 for compressing air and improving operational stability. A strength pressure transmitter 26 is installed above the heat dissipation chamber 5, which is the main detection structure.

[0027] Specifically, the air inlet channel 6 and the air outlet channel 7 are connected to the air inlet pipe and the air outlet pipe respectively. Then, the instrument can be turned on to start the strength test of the molding sand. The gas enters the piezoelectric valve 27 through the air inlet groove 9, is compressed and discharged from the air outlet groove 10, and then discharged through the air outlet channel 7. Finally, it is discharged into the solenoid valve used to control the movement of the air hammer, so as to realize the control of the air hammer.

[0028] In this embodiment, air pipe locking rings 8 are installed on the outer diameter of both the air inlet channel 6 and the air outlet channel 7. A terminal block 28 is installed in the middle of the left end of the base 1. Bent magnetic plates 29 are movably connected to the upper and lower sides of the left end of the base 1. Several wire grooves 30 are provided on the inner side of each bent magnetic plate 29. The pipe is locked by the air pipe locking rings 8. The wire head is inserted into the terminal block 28. The two bent magnetic plates 29 are joined together. The magnetic attraction between the magnetic plates is used to stabilize the connecting wire.

[0029] Furthermore, an exhaust groove 11 is fixedly connected inside the airflow control chamber 4. The exhaust groove 11 is connected to the outside through an exhaust pipe, and a muffler 12 is installed at the end of the exhaust pipe. When the piezoelectric valve 27 stops working, exhaust is emitted, and exhaust noise is reduced at the same time.

[0030] Furthermore, air pressure sensors 13 are installed on the outer diameter of the air intake channel 6 and the air outlet channel 7 inside the airflow control cavity 4. Two air pressure gauges 23 are provided at the middle of the right end of the base 1. The air pressure sensors 13 on the corresponding side of the air pressure gauges 23 are electrically connected to sense the air pressure value.

[0031] Furthermore, a telescopic cylinder 14 is installed on one end of the partition plate 3 near the air intake slot 9. The drive end of the telescopic cylinder 14 extends through into the interior of the air intake slot 9 and is fitted with a rubber plug 15. In an emergency, the telescopic cylinder 14 can be used to drive the rubber plug 15 to seal the air intake end, thereby improving safety.

[0032] Furthermore, the middle of the end of the air inlet slot 9 near the air outlet slot 10 is connected to the interior of the air outlet slot 10 via a connecting pipe 16, and a control valve 17 is installed on the outer diameter of the connecting pipe 16.

[0033] Specifically, during the testing process, the air pressure is observed by the air pressure sensor 13 in conjunction with the air pressure gauge 23. When the air pressure tends to stabilize, the piezoelectric valve 27 can be closed and the control valve 17 can be opened, so that the airflow can directly enter the air outlet 10 from the air inlet 9 and then be discharged. This can greatly reduce the consumption of compressed air, reduce energy consumption, and reduce the operating costs of enterprises.

[0034] Furthermore, the air inlet of the piezoelectric valve 27 is connected to the inside of the air inlet groove 9, the air outlet of the piezoelectric valve 27 is connected to the inside of the air outlet groove 10, and the exhaust end of the piezoelectric valve 27 is connected to the inside of the exhaust groove 11. A control panel 25 is installed on one side of the front end of the base 1, and the control panel 25 is electrically connected to the pressure transmitter 26 and the piezoelectric valve 27, which facilitates control.

[0035] Furthermore, a hollow disk 18 is installed inside the heat dissipation cavity 5. One side of the middle section of the air intake channel 6 passes through the outer wall of the base 1 via an airflow branch pipe 19 and connects to the interior of the hollow disk 18. Several Venturi tubes 20 are welded to the upper surface of the hollow disk 18, and the bottom ends of all Venturi tubes 20 are connected to the interior of the hollow disk 18. A portion of the airflow is introduced into the hollow disk 18 via the airflow branch pipe 19 and then ejected through the Venturi tubes 20. Utilizing the Venturi effect, the ejected gas has a high velocity and low temperature, which better dissipates heat from the instrument and extends the service life of the device.

[0036] Furthermore, a mounting bracket 21 is installed on the upper side of the heat dissipation cavity 5. A grid plate 22 is provided in the middle of the mounting bracket 21. Heat dissipation windows 24 are provided on both sides of the upper surface of the base 1 to facilitate installation and heat dissipation of the instrument.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control instrument for detecting the strength of molding sand, comprising a base (1), characterized in that: The top of the base (1) is bolted to a top shell (2). The interior of the base (1) is divided into an airflow control chamber (4) and a heat dissipation chamber (5) by a partition plate (3). An air intake channel (6) is installed on the rear right side of the base (1), and an air outlet channel (7) is installed on the front right side of the base (1). An air intake groove (9) is fixedly connected to the side of the airflow control chamber (4) near the air intake channel (6), and the interior of the air intake groove (9) is connected to the air intake channel (6). The interior of the airflow control chamber (4)... An air outlet groove (10) is fixedly connected to the side of the air outlet channel (7), and the interior of the air outlet groove (10) is connected to the air outlet channel (7). A piezoelectric valve (27) is installed above the airflow control chamber (4), and a high-intensity pressure transmitter (26) is installed above the heat dissipation chamber (5). Air pipe locking rings (8) are installed on the outer diameter of both the air inlet channel (6) and the air outlet channel (7). A terminal block (28) is installed in the middle of the left end of the base (1). Bending magnetic plates (29) are movably connected to the upper and lower sides of the left end of the base (1). (29) has several wire grooves (30) on its inner end; the air inlet channel (6) and the air outlet channel (7) are equipped with air pressure sensors (13) on their outer diameters inside the airflow control chamber (4); two air pressure gauges (23) are provided in the middle of the right end of the base (1), and the air pressure sensors (13) on the corresponding sides of the air pressure gauges (23) are electrically connected; the air inlet end of the piezoelectric valve (27) is connected to the inside of the air inlet groove (9), the air outlet end of the piezoelectric valve (27) is connected to the inside of the air outlet groove (10), and the air outlet end of the piezoelectric valve (27) is connected to the inside of the air outlet groove (10). 11) The internal connections are as follows: a control panel (25) is installed on one side of the front end of the base (1), and the control panel (25) is electrically connected to the intensity pressure transmitter (26) and the piezoelectric valve (27); a hollow disk (18) is installed inside the heat dissipation cavity (5); the middle side of the air intake channel (6) passes through the outer wall of the base (1) through the airflow branch pipe (19) and is connected to the inside of the hollow disk (18); a number of Venturi tubes (20) are welded on the upper surface of the hollow disk (18), and the bottom end of each Venturi tube (20) is connected to the inside of the hollow disk (18).

2. The control instrument for detecting molding sand strength according to claim 1, characterized in that: The airflow control chamber (4) is also fixedly connected to an exhaust groove (11), which is connected to the outside through an exhaust pipe and a muffler (12) is installed at the end of the exhaust pipe.

3. The control instrument for detecting molding sand strength according to claim 1, characterized in that: A telescopic cylinder (14) is installed on one end of the partition plate (3) near the air inlet groove (9). The drive end of the telescopic cylinder (14) extends through into the interior of the air inlet groove (9) and is fitted with a rubber plug (15).

4. The control instrument for detecting molding sand strength according to claim 1, characterized in that: The air inlet slot (9) is connected to the interior of the air outlet slot (10) via a connecting pipe (16) at the middle of one end near the air outlet slot (10). A control valve (17) is installed on the outer diameter of the connecting pipe (16).

5. The control instrument for detecting molding sand strength according to claim 1, characterized in that: The heat dissipation cavity (5) is equipped with a mounting bracket (21) on the upper side inside. The mounting bracket (21) has a grid plate (22) in the middle. The base (1) has heat dissipation windows (24) on both sides of its upper surface.

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