Tray limiting detection unit and device of dental sintering furnace

Abstract

The utility model discloses a tray limiting detection unit and device of a dental sintering furnace, and relates to the technical field of limiting detection. The limiting detection unit comprises a double-contact limiting switch, a first photoelectric coupling module, a second photoelectric coupling module, a normally closed end state output end and a normally open end state output end; the normally closed end of the double-contact limit switch is connected with the input end of the first photoelectric coupling module; the normally open end of the double-contact limit switch is connected with the input end of the second photoelectric coupling module; and the common end of the double-contact limit switch is grounded. According to the utility model, the double-contact limit switch is used as a contact action element, the normally open end is disconnected with the common end and the normally closed end is short-circuited with the common end under the non-action condition, the normally open end is short-circuited with the common end and the normally closed end is disconnected with the common end under the action condition, and when the normally open end and the common end are both disconnected, the connection is disconnected. Detection of connection and disconnection states is realized, and safety of tray operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of position limit detection, in particular to a tray position limit detection unit and a device for a dental sintering furnace. Background Art

[0002] As an important mechanical component of the dental sintering furnace, the operating space of the tray affects the airtightness of the furnace, which in turn affects the internal temperature of the furnace and ultimately determines the sintering effect of the teeth. As a conventional detection structure, the tray limit detection Figure 1 There are two ways, one of which is Figure 1 As shown in (a), one end of the limit switch is the sampling end SAMPLE, and the other end is grounded. After detecting a low level, it is considered that the limit has reached the boundary and the corresponding operation is performed. Another method is as follows Figure 1 As shown in (b), one end of the limit switch is the sampling end SAMPLE, and the other end is connected to the voltage source through a limit resistor. After detecting a high level, it is considered that the limit has reached the boundary and the corresponding operation is performed.

[0003] After the pallet is running, the main control board periodically detects whether the pallet limit device has reached the boundary. If it has reached the boundary, the pallet stops. Otherwise, it continues to run and detect until it reaches the boundary, and the pallet stops. However, during the operation of the pallet, the pallet limit detection device fails in the middle of the circuit break. The main control board cannot detect that the pallet limit device has reached the boundary. The pallet keeps running and hits the furnace, causing inconvenience to the user. Utility Model Content

[0004] The utility model aims to provide a tray limit detection unit and device for a dental sintering furnace, which can realize the detection of the connection disconnection state while realizing the tray limit detection, so as to ensure the safety of the tray operation.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] A tray limit detection unit for a dental sintering furnace, the limit detection unit comprising: a double-contact limit switch, a first photoelectric coupling module, a second photoelectric coupling module, a normally closed end state output terminal and a normally open end state output terminal;

[0007] The normally closed end of the double-contact limit switch is connected to the input end of the first photoelectric coupling module; the output end of the first photoelectric coupling module is connected to the normally closed end state output end;

[0008] The normally open end of the double-contact limit switch is connected to the input end of the second photoelectric coupling module; the output end of the second photoelectric coupling module is connected to the normally open state output end;

[0009] The common terminal of the double-contact limit switch is grounded.

[0010] Optionally, the first photoelectric coupling module includes a first current limiting resistor, a first photoelectric coupler and a second position limiting resistor;

[0011] The anode of the LED diode of the first photoelectric coupler is connected to one end of the first current limiting resistor, and the cathode of the LED diode of the first photoelectric coupler is connected to the normally closed end of the double-contact limit switch;

[0012] The anode of the photodiode of the first photocoupler is connected to one end of the second limiting resistor, and the cathode of the photodiode of the first photocoupler is grounded; the anode of the photodiode of the first photocoupler is also connected to the normally closed state output terminal;

[0013] The other end of the first current limiting resistor and the other end of the second position limiting resistor are both connected to a voltage source.

[0014] Optionally, the second photoelectric coupling module includes a third limiting resistor, a second photoelectric coupler and a fourth limiting resistor;

[0015] The anode of the LED diode of the second photoelectric coupler is connected to one end of the third limiting resistor, and the cathode of the LED diode of the second photoelectric coupler is connected to the normally open end of the double-contact limit switch;

[0016] The anode of the photodiode of the second photocoupler is connected to one end of the fourth limiting resistor, and the cathode of the photodiode of the second photocoupler is grounded; the anode of the photodiode of the second photocoupler is also connected to the normally open state output terminal;

[0017] The other end of the third limiting resistor and the other end of the fourth limiting resistor are both connected to a voltage source.

[0018] A tray limit detection device for a dental sintering furnace, the limit detection device comprising an upper limit detection unit, a lower limit detection unit and a controller;

[0019] The upper limit detection unit and the lower limit detection unit are both the above-mentioned limit detection units;

[0020] The double-contact limit switch of the upper limit detection unit is set at the upper limit position of the tray, and the double-contact limit switch of the lower limit detection unit is set at the lower limit position of the tray;

[0021] The normally closed end state output terminal and the normally open end state output terminal of the upper limit detection unit and the normally closed end state output terminal and the normally open end state output terminal of the lower limit detection unit are all connected to the controller.

[0022] Optionally, the controller includes: a first AND gate circuit, a first high level trigger, a first alarm, a first low level trigger and a second AND gate circuit;

[0023] The two input terminals of the first AND gate circuit are respectively connected to the normally closed end state output terminal and the normally open end state output terminal of the upper limit detection unit in a one-to-one correspondence;

[0024] The output end of the first AND gate circuit is connected to the input end of the first high level trigger and the input end of the first low level trigger respectively;

[0025] The output end of the first high level trigger is connected to the first alarm;

[0026] The output end of the first low-level trigger is connected to one input end of the second AND gate circuit, and the other input end of the second AND gate circuit is connected to the normally-open state output end of the upper limit detection unit.

[0027] Optionally, the controller includes: a third AND gate circuit, a second high level trigger, a second alarm, a second low level trigger and a fourth AND gate circuit;

[0028] The two input terminals of the third AND gate circuit are respectively connected to the normally closed end state output terminal and the normally open end state output terminal of the lower limit detection unit in a one-to-one correspondence;

[0029] The output end of the third AND gate circuit is connected to the input end of the second high level trigger and the input end of the second low level trigger respectively;

[0030] The output end of the second high level trigger is connected to the second alarm;

[0031] The output end of the second low-level trigger is connected to one input end of the fourth AND gate circuit, and the other input end of the fourth AND gate circuit is connected to the normally open state output end of the lower limit detection unit.

[0032] Optionally, the controller is an ITE series SOC type single chip microcomputer.

[0033] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:

[0034] The embodiment of the utility model provides a tray limit detection unit and device for a dental sintering furnace, wherein the limit detection unit comprises: a double-contact limit switch, a first photoelectric coupling module, a second photoelectric coupling module, a normally closed end state output end and a normally open end state output end; the normally closed end of the double-contact limit switch is connected to the input end of the first photoelectric coupling module; the output end of the first photoelectric coupling module is connected to the normally closed end state output end; the normally open end of the double-contact limit switch is connected to the input end of the second photoelectric coupling module; the output end of the second photoelectric coupling module is connected to the normally open end state output end; and the common end of the double-contact limit switch is grounded. The utility model adopts a double-contact limit switch as a contact action element, namely a normally open end, a normally closed end and a common end. In the non-action state, the normally open end and the common end are disconnected, and the normally closed end and the common end are short-circuited. In the action state, the normally open end and the common end are short-circuited, and the normally closed end and the common end are disconnected. When both are disconnected, it indicates that the connection is disconnected. While realizing the tray limit detection, the detection of the connection disconnection state is realized to ensure the safety of the tray operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of an existing detection structure in the background technology of the present utility model;

[0037] Figure 2 A schematic diagram of the structure of an upper limit detection unit provided in an embodiment of the utility model;

[0038] Figure 3 A schematic diagram of the structure of a lower limit detection unit provided in an embodiment of the utility model;

[0039] Figure 4 A schematic diagram of a sampling waveform provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The utility model aims to provide a tray limit detection unit and device for a dental sintering furnace, which can realize the detection of the connection disconnection state while realizing the tray limit detection, so as to ensure the safety of the tray operation.

[0042] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Example 1

[0044] Embodiment 1 of the utility model provides a tray limit detection unit for a dental sintering furnace, wherein the limit detection unit comprises: a double-contact limit switch, a first photoelectric coupling module, a second photoelectric coupling module, a normally closed end state output terminal and a normally open end state output terminal; the normally closed end of the double-contact limit switch is connected to the input end of the first photoelectric coupling module; the output end of the first photoelectric coupling module is connected to the normally closed end state output terminal; the normally open end of the double-contact limit switch is connected to the input end of the second photoelectric coupling module; the output end of the second photoelectric coupling module is connected to the normally open end state output terminal; and the common end of the double-contact limit switch is grounded.

[0045] Among them, the first photoelectric coupling module includes a first current limiting resistor, a first photoelectric coupler and a second limiting resistor; the anode of the LED diode of the first photoelectric coupler is connected to one end of the first current limiting resistor, and the cathode of the LED diode of the first photoelectric coupler is connected to the normally closed end of the double-contact limit switch; the anode of the photodiode of the first photoelectric coupler is connected to one end of the second limiting resistor, and the cathode of the photodiode of the first photoelectric coupler is grounded; the anode of the photodiode of the first photoelectric coupler is also connected to the normally closed end state output end; the other end of the first current limiting resistor and the other end of the second limiting resistor are both connected to a voltage source.

[0046] The second photoelectric coupling module includes a third limiting resistor, a second photoelectric coupler and a fourth limiting resistor; the anode of the LED diode of the second photoelectric coupler is connected to one end of the third limiting resistor, and the cathode of the LED diode of the second photoelectric coupler is connected to the normally open end of the double-contact limit switch; the anode of the photodiode of the second photoelectric coupler is connected to one end of the fourth limiting resistor, and the cathode of the photodiode of the second photoelectric coupler is grounded; the anode of the photodiode of the second photoelectric coupler is also connected to the normally open end state output end; the other end of the third limiting resistor and the other end of the fourth limiting resistor are both connected to a voltage source.

[0047] Example 2

[0048] Embodiment 2 of the utility model provides a tray limit detection device for a dental sintering furnace, the limit detection device comprising an upper limit detection unit, a lower limit detection unit and a controller; the upper limit detection unit and the lower limit detection unit are both the above-mentioned limit detection units; the double-contact limit switch of the upper limit detection unit is arranged at the upper limit position of the tray, and the double-contact limit switch of the lower limit detection unit is arranged at the lower limit position of the tray; the normally closed end state output terminal and the normally open end state output terminal of the upper limit detection unit and the normally closed end state output terminal and the normally open end state output terminal of the lower limit detection unit are all connected to the controller.

[0049] The double-contact limit switch in the embodiment of the utility model uses electrical hardware to detect the rising process of the pallet. When the pallet approaches the limit contact, the connecting rod of the double-contact limit switch will make the normally open contact closed (that is, the normally open end and the common end are closed) and the normally closed contact disconnected (that is, the normally closed end and the common end are disconnected). After the photoelectric coupler detects the change of the corresponding switch state, it transmits the state signal to the controller. The controller performs a series of state logic judgments based on the received data, and after confirming that the double-contact limit switch is actuated, it issues a pallet start or stop command, and the pallet executes the action accordingly.

[0050] like Figure 2 As shown, the left side of the first photocoupler 11 of the upper limit detection unit is an LED diode, the input side 111 of the LED diode of the first photocoupler 11 of the upper limit detection unit is connected to the first current limiting resistor and the voltage source V of the upper limit detection unit, the output side 112 of the LED diode of the first photocoupler 11 of the upper limit detection unit is connected to the normally closed end UP_NC of the double-contact limit switch 1 of the upper limit detection unit, and the right side is a photodiode, the input side 113 of the photodiode of the first photocoupler 11 of the upper limit detection unit is connected to the second current limiting resistor and the voltage source V of the upper limit detection unit, and its normally closed end state output end UP_NC_SAMPLE is connected to the controller, and the output side 114 of the photodiode of the first photocoupler 11 of the upper limit detection unit is grounded. The second photoelectric coupler 12 of the upper limit detection unit has an LED diode on the left side, the input side 121 of the LED diode of the second photoelectric coupler 12 of the upper limit detection unit is connected to the third current limiting resistor and the voltage source V of the upper limit detection unit, the output side 122 of the LED diode of the second photoelectric coupler 12 of the upper limit detection unit is connected to the normally open end UP_NO of the double-contact limit switch 1 of the upper limit detection unit, and the right side is a photodiode, the input side 123 of the photodiode of the second photoelectric coupler 12 of the upper limit detection unit is connected to the fourth current limiting resistor and the voltage source V of the upper limit detection unit, and its normally open end state output end UP_NO_SAMPLE is connected to the controller, and the output side 124 of the photodiode of the second photoelectric coupler 12 of the upper limit detection unit is grounded.

[0051] like Figure 3 As shown, the left side of the first photocoupler 21 of the lower limit detection unit is an LED diode, the input side 211 of the LED diode of the first photocoupler 21 of the lower limit detection unit is connected to the first current limiting resistor and the voltage source V of the lower limit detection unit, the output side 212 of the LED diode of the first photocoupler 21 of the lower limit detection unit is connected to the normally closed end DOWN_NC of the double-contact limit switch 2 of the lower limit detection unit, and the right side is a photodiode, the input side 213 of the photodiode of the first photocoupler 21 of the lower limit detection unit is connected to the second current limiting resistor and the voltage source V of the lower limit detection unit, and its normally closed end state output end DOWN_NC_SAMPLE is connected to the controller, and the output side 214 of the photodiode of the first photocoupler 21 of the lower limit detection unit is grounded. The second photoelectric coupler 22 of the lower limit detection unit has an LED diode on the left side, the input side 221 of the LED diode of the second photoelectric coupler 22 of the lower limit detection unit is connected to the third current limiting resistor and the voltage source V of the lower limit detection unit, the output side 222 of the LED diode of the second photoelectric coupler 22 of the lower limit detection unit is connected to the normally open end DOWN_NO of the double-contact limit switch 2 of the lower limit detection unit, and the right side is a photodiode, the input side 223 of the photodiode of the second photoelectric coupler 22 of the lower limit detection unit is connected to the fourth current limiting resistor and the voltage source V of the lower limit detection unit, and its normally open end state output end DOWN_NO_SAMPLE is connected to the controller, and the output side 224 of the photodiode of the second photoelectric coupler 22 of the lower limit detection unit is grounded.

[0052] The utility model selects a double-contact limit switch as a contact action element, namely a normally open end, a normally closed end and a common end. In the non-action state, the normally open end and the common end are disconnected, and the normally closed end and the common end are short-circuited. In the action state, the normally open end and the common end are short-circuited, and the normally closed end and the common end are disconnected.

[0053] The left side of the optocoupler is an LED diode. The input side of the LED diode is connected to the voltage source due to the current limiting resistor. As long as the output side is connected to the ground, the LED diode will turn on and emit light, causing the photodiode on the right to react and close. The controller can detect the level change and use it as the basis for the action of the limit contact.

[0054] When the pallet limit detection device is disconnected, the normally closed sampling end (i.e. the normally closed end state output end NC_SAMPLE) should detect a high level, and the normally open sampling end (i.e. the normally open end state output end NO_SAMPLE) should detect a high level; when the pallet limit detection device is connected normally and not in action, the normally closed sampling end should detect a low level, and the normally open sampling end should detect a high level; when the pallet limit detection device is connected and in action normally, the normally closed sampling end should detect a high level, and the normally open sampling end should detect a low level. The specific sampling waveforms are as follows: Figure 4 shown.

[0055] based on Figure 4 The utility model sets a specific structure of the controller.

[0056] In one example, the controller includes: a first AND gate circuit, a first high-level trigger, a first alarm, a first low-level trigger and a second AND gate circuit; the two input ends of the first AND gate circuit are respectively connected to the normally closed state output end and the normally open state output end of the upper limit detection unit in a one-to-one correspondence; the output end of the first AND gate circuit is respectively connected to the input end of the first high-level trigger and the input end of the first low-level trigger; the output end of the first high-level trigger is connected to the first alarm; the output end of the first low-level trigger is connected to one input end of the second AND gate circuit, and the other input end of the second AND gate circuit is connected to the normally open state output end of the upper limit detection unit.

[0057] The controller includes: a third AND gate circuit, a second high-level trigger, a second alarm, a second low-level trigger and a fourth AND gate circuit; the two input ends of the third AND gate circuit are respectively connected to the normally closed end state output end and the normally open end state output end of the lower limit detection unit in a one-to-one correspondence; the output end of the third AND gate circuit is respectively connected to the input end of the second high-level trigger and the input end of the second low-level trigger; the output end of the second high-level trigger is connected to the second alarm; the output end of the second low-level trigger is connected to an input end of the fourth AND gate circuit, and the other input end of the fourth AND gate circuit is connected to the normally open end state output end of the lower limit detection unit.

[0058] In the embodiment of the utility model, not only the first alarm and the second alarm are provided to alarm when the connection is broken, but also the second AND gate circuit and the fourth AND gate circuit are provided, so that when no circuit breaks, it is possible to accurately judge whether it is in the limit position according to the state of the normally open end output terminal. When a circuit breaks, it is always displayed in the limit position state to avoid the risk of tray collision.

[0059] In another example, the controller uses the ITE series SOC for data collection of pallet limit and logical judgment of failure.

[0060] The utility model can effectively detect the operating status of the dental sintering furnace tray, reduce the impact risk caused by abnormal tray limit connection, reduce the customer's maintenance cost, and further improve the customer experience.

[0061] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A tray limit detection unit for a dental sintering furnace, characterized in that: The limit detection unit comprises: a double-contact limit switch, a first photoelectric coupling module, a second photoelectric coupling module, a normally closed end state output terminal and a normally open end state output terminal; The normally closed end of the double-contact limit switch is connected to the input end of the first photoelectric coupling module; the output end of the first photoelectric coupling module is connected to the normally closed end state output end; The normally open end of the double-contact limit switch is connected to the input end of the second photoelectric coupling module; the output end of the second photoelectric coupling module is connected to the normally open state output end; The common terminal of the double-contact limit switch is grounded.

2. The tray limit detection unit of the dental sintering furnace according to claim 1, characterized in that: The first photoelectric coupling module includes a first current limiting resistor, a first photoelectric coupler and a second position limiting resistor; The anode of the LED diode of the first photoelectric coupler is connected to one end of the first current limiting resistor, and the cathode of the LED diode of the first photoelectric coupler is connected to the normally closed end of the double-contact limit switch; The anode of the photodiode of the first photocoupler is connected to one end of the second limiting resistor, and the cathode of the photodiode of the first photocoupler is grounded; the anode of the photodiode of the first photocoupler is also connected to the normally closed state output terminal; The other end of the first current limiting resistor and the other end of the second position limiting resistor are both connected to a voltage source.

3. The tray limit detection unit of the dental sintering furnace according to claim 1, characterized in that: The second photoelectric coupling module includes a third limiting resistor, a second photoelectric coupler and a fourth limiting resistor; The anode of the LED diode of the second photoelectric coupler is connected to one end of the third limiting resistor, and the cathode of the LED diode of the second photoelectric coupler is connected to the normally open end of the double-contact limit switch; The anode of the photodiode of the second photocoupler is connected to one end of the fourth limiting resistor, and the cathode of the photodiode of the second photocoupler is grounded; the anode of the photodiode of the second photocoupler is also connected to the normally open state output terminal; The other end of the third limiting resistor and the other end of the fourth limiting resistor are both connected to a voltage source.

4. A tray limit detection device for a dental sintering furnace, characterized in that: The limit detection device comprises an upper limit detection unit, a lower limit detection unit and a controller; The upper limit detection unit and the lower limit detection unit are both the limit detection units according to any one of claims 1 to 3; The double-contact limit switch of the upper limit detection unit is set at the upper limit position of the tray, and the double-contact limit switch of the lower limit detection unit is set at the lower limit position of the tray; The normally closed end state output terminal and the normally open end state output terminal of the upper limit detection unit and the normally closed end state output terminal and the normally open end state output terminal of the lower limit detection unit are all connected to the controller.

5. The tray limit detection device for a dental sintering furnace according to claim 4, characterized in that: The controller comprises: a first AND gate circuit, a first high level trigger, a first alarm, a first low level trigger and a second AND gate circuit; The two input terminals of the first AND gate circuit are respectively connected to the normally closed end state output terminal and the normally open end state output terminal of the upper limit detection unit in a one-to-one correspondence; The output end of the first AND gate circuit is connected to the input end of the first high level trigger and the input end of the first low level trigger respectively; The output end of the first high level trigger is connected to the first alarm; The output end of the first low-level trigger is connected to one input end of the second AND gate circuit, and the other input end of the second AND gate circuit is connected to the normally-open state output end of the upper limit detection unit.

6. The tray limit detection device for a dental sintering furnace according to claim 5, characterized in that: The controller further comprises: a third AND gate circuit, a second high level trigger, a second alarm, a second low level trigger and a fourth AND gate circuit; The two input terminals of the third AND gate circuit are respectively connected to the normally closed end state output terminal and the normally open end state output terminal of the lower limit detection unit in a one-to-one correspondence; The output end of the third AND gate circuit is connected to the input end of the second high level trigger and the input end of the second low level trigger respectively; The output end of the second high level trigger is connected to the second alarm; The output end of the second low-level trigger is connected to one input end of the fourth AND gate circuit, and the other input end of the fourth AND gate circuit is connected to the normally open state output end of the lower limit detection unit.

7. The tray limit detection device for a dental sintering furnace according to claim 4, characterized in that: The controller is an ITE series SOC type single chip microcomputer.

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