Synchronization in-place detection circuit and limit alarm device for synchronous drive mechanism

Abstract

The present invention provides a synchronous in-place detection circuit and a limit alarm device for a synchronous transmission mechanism. A limit switch is correspondingly arranged at the in-place position of each moving part. All the limit switches are connected in sequence and then connected to the driver to confirm the synchronous in-place of the moving parts. The specific confirmation method is as follows: if the limit switch is not in place, a high-level out-of-place signal is sent. All the limit switches are turned on in sequence. When the driver receives the high-level out-of-place signal, it determines that the synchronous transmission mechanism is not in place; if any limit switch is in place, a low-level in-place signal is triggered. When the driver receives the low-level in-place signal, since multiple moving parts are in place synchronously, it is determined that the synchronous transmission mechanism is in place. For the synchronous in-place detection circuit and the limit alarm device for the synchronous transmission mechanism of the present invention, only one path of signal needs to be connected to the acquisition end of the driver, and less hardware resources are invested. Moreover, when a single limit switch fails, it does not affect the normal use, improving the overall reliability of the system.

Description

Technical Field

[0001] The present invention belongs to the field of mechanism limit, and in particular relates to a synchronous in-place detection circuit and a limit alarm device for a synchronous transmission mechanism. Background Art

[0002] In a general single-channel input and multi-channel output synchronous transmission mechanism, a motor is usually used as the power source for single-channel input. The transmission of multiple output channels is realized through a reversing box, a linkage shaft, a coupling, a linear motion mechanism, etc., that is, multiple moving parts of the synchronous transmission mechanism are lifted or translated simultaneously. The limit device mainly plays the role of safety protection and alarm. Generally, limit switches are used at the upper and lower limit positions of the linear motion mechanism. The multiple limit switches are connected in series in a normal way, or a single limit switch is installed at the position where all moving parts are triggered first. The output signal of the limit switch is connected to the acquisition end of the motor controller. When the output signal changes, the motor controller judges the corresponding limit state information to make the motor continue to run or stop.

[0003] However, the above-mentioned scheme still has the following three problems in the process of engineering implementation and application:

[0004] (1) The limit switches are only connected in series in a normal way. Although the acquisition end can detect the signal output by the limit switch, it is impossible to determine which specific output channel has a limit alarm.

[0005] (2) Assuming that a single limit switch is installed at the position where all moving parts are triggered first, then when the limit switch fails (a failure situation where although the physical trigger condition has been met, the signal output of the limit switch remains unchanged due to damage to internal components, etc.), the acquisition end cannot detect the signal change of the limit switch output, and thus the motor operation state will not be changed, resulting in a relatively high risk of safety accidents.

[0006] (3) Considering the characteristics of a multi-output channel synchronous transmission mechanism, in engineering, a scheme is often used where each output channel independently uses a limit switch and is connected to the acquisition end of the controller respectively. Then the motor controller must have multi-channel acquisition hardware, resulting in high costs; and the acquisition (polling) of the controller usually has a relatively slow response time, and it is easy to occur that the transmission mechanism cannot change the operation state in time, thus generating potential safety hazards. Summary of the Invention

[0007] In view of this, the present invention aims to provide a synchronous in-place detection circuit and a limit alarm device for a synchronous transmission mechanism to solve the problem that when the existing synchronous transmission mechanism determines synchronous in-place, if each limit component is connected in series and then connected to the controller, it is impossible to determine which specific output channel has a limit alarm; if each output channel independently uses a limit switch and is connected to the acquisition end of the controller respectively, the cost is high and the response is slow.

[0008] To achieve the above object, the technical solution of the present invention is implemented as follows:

[0009] On the one hand, the present application proposes a synchronous in-place detection circuit for detecting signals of multiple moving components in a synchronous transmission mechanism in place. It includes a power supply module, a driving unit, and multiple in-place detection units. One in-place detection unit is correspondingly arranged at the in-place position of each moving component. The in-place detection unit includes a first power supply terminal, a second power supply terminal, and a signal terminal. The power supply module includes a first power supply terminal and a second power supply terminal;

[0010] The multiple in-place detection units are connected in sequence. The signal terminal of one in-place detection unit among two adjacent in-place detection units is connected to the first power supply terminal of the other in-place detection unit. The first power supply terminal of the first in-place detection unit is connected to the first power supply terminal of the power supply module. The second power supply terminals of all in-place detection units are connected to the second power supply terminal. The signal terminal of the last in-place detection unit is connected to the signal receiving end of the driving unit;

[0011] The signal terminal is a voltage signal. When the moving component is not in place, the voltage value of the signal terminal is the same as the voltage value of the first power supply terminal. When the moving component is in place, the voltage value of the signal terminal is different from the voltage value of the first power supply terminal.

[0012] Further, one of the first power supply terminal and the second power supply terminal is a positive power supply terminal, and the other is a negative power supply terminal.

[0013] Further, it includes a warning light. A first branch is provided on the connection line between two adjacent in-place detection units. The first branch is connected to the warning light and then connected to the second power supply terminal. When the moving component is in place, the voltage value of the signal terminal is the same as the voltage value of the second power supply terminal.

[0014] Further, the in-place detection unit is a three-wire limit switch; the power supply module is a power supply, and an in-line DC regulated power supply is adopted, and the supply voltage is 24V.

[0015] On the other hand, the present application also proposes a limit alarm device for a synchronous transmission mechanism for detecting signals of multiple moving components in a synchronous transmission mechanism in place. It includes a power supply module, a driver, and multiple limit switches. One limit switch is correspondingly arranged at the in-place position of each moving component. The limit switch includes a first power supply terminal, a second power supply terminal, and a signal terminal. The power supply module includes a first power supply terminal and a second power supply terminal;

[0016] The multiple limit switches are connected in sequence. The signal terminal of one limit switch among two adjacent limit switches is connected to the first power supply terminal of the other limit switch. The first power supply terminal of the first limit switch is connected to the first power supply terminal of the power supply module. The second power supply terminals of all limit switches are connected to the second power supply terminal. The signal terminal of the last limit switch is connected to the signal receiving end of the driver;

[0017] The output terminal of the driver is connected to the motor, and the motor synchronously drives a plurality of moving components to move in the same direction. The driver drives the motor to rotate according to the signal at the signal terminal.

[0018] The signal terminal is a voltage signal. When the moving component is not in place, the voltage value at the signal terminal is the same as the voltage value of the first power supply terminal. The driver receives the signal that the moving component is not in place and controls the motor to keep working normally. When the moving component is in place, the voltage value at the signal terminal is different from the voltage value of the first power supply terminal. The driver receives the signal that the moving component is in place and controls the motor to stop rotating or reverse.

[0019] Further, one of the first power supply terminal and the second power supply terminal is a positive power supply terminal, and the other is a negative power supply terminal.

[0020] Further, it includes a warning lamp. A first branch is provided on the connection line between two adjacent limit switches. The first branch is connected to the warning lamp and then connected to the second power supply terminal. When the moving component is in place, the voltage value at the signal terminal is the same as the voltage value of the second power supply terminal.

[0021] Further, the positions where multiple moving components synchronously reach are on the same straight line. When all the limit switches are installed, the positions where multiple moving components synchronously reach are simultaneously irradiated by a laser tracker, and the in-place detection switches are installed according to the irradiation points of the laser on each synchronous in-place position.

[0022] Further, the limit switch is a three-wire limit switch; the power supply module is a power supply, and an end-bearing DC regulated power supply is adopted, and the supply voltage is 24V.

[0023] Compared with the prior art, the synchronous in-place detection circuit and the limit alarm device of the synchronous transmission mechanism of the present invention have the following beneficial effects:

[0024] (1) In the synchronous in-place detection circuit of the present invention, multiple moving components in the transmission mechanism reach in place synchronously. Each moving component is correspondingly installed with a limit switch, and multiple limit switches are connected in series in sequence. When not in place, each limit switch is connected in sequence, and different supply voltage signals are sent out when in place and not in place, so as to control the alarm module to send out an in-place warning, saving the multi-channel acquisition hardware of the motor controller and reducing the cost.

[0025] (2) In the synchronization in-place detection circuit of the present invention, when the power supply terminal 1 is the positive power supply terminal, if a certain limit switch fails and continuously outputs a low-level in-place signal, the subsequent limit switches will also sequentially output low-level in-place signals, and the driver will control the motor of the transmission mechanism to stop rotating for timely maintenance; if a certain limit switch fails and continuously outputs a high-level not-in-place signal, the subsequent limit switches will work normally through the high level. When a low-level in-place signal appears in the subsequent limit switch, the driver can control the motor to stop rotating, ensuring that the motor stops rotating as much as possible after the moving part reaches the position. When a single limit switch fails, it does not affect the normal use, improving the overall reliability of the system and greatly reducing the accident risk and potential safety hazards;

[0026] Similarly, when the power supply terminal 1 is the negative power supply terminal, the low-level signal output by the signal terminal of the end limit switch indicates not in place, and the high-level signal output by the signal terminal of the end limit switch indicates in place; if a certain limit switch fails and continuously outputs a low-level in-place signal, when the subsequent connected limit switch sends out a high-level signal when it reaches the position, the driver can still control the stop and reverse. When other limit switches except the end limit switch fail, the driver can still send an alarm to the driver according to the low-level signal sent out when the end limit switch reaches the position, greatly reducing the accident risk. If a certain limit switch fails and continuously outputs a high-level in-place signal, the driver sends out an in-place signal according to the high-level signal to timely repair the faulty limit switch.

[0027] (3) In the limit alarm device for the synchronous transmission mechanism of the present invention, according to the basic principle of the motor driver, the response speed of the driver to monitor the operating state of the motor is much higher than the speed of each limit switch corresponding to the controller acquisition end and periodically querying through the controller, and it can respond to the in-place of the transmission mechanism in a timely manner, effectively avoiding the occurrence of dangerous situations and obtaining higher stability and reliability.

[0028] (4) In the limit alarm device for the synchronous transmission mechanism of the present invention, by setting an indicator light, the faulty limit switch can be quickly discovered, improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0030] Figure 1 is a schematic diagram of a limit alarm device for a synchronous transmission mechanism according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of the connection relationship of a synchronous transmission mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0035] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0036] On the one hand, the present application proposes a synchronization in-place detection circuit, and the specific embodiments are as follows:

[0037] On the one hand, the present application proposes a synchronization in-place detection circuit, and the specific embodiments are as follows:

[0038] It includes a power supply module, a driving unit, and a plurality of in-place detection units. One in-place detection unit is correspondingly arranged at the in-place position of each moving part. The in-place detection unit includes a first power supply terminal, a second power supply terminal, and a signal terminal. The power supply module includes a first power supply terminal and a second power supply terminal;

[0039] Multiple in-place detection units are connected in sequence. The signal terminal of one in-place detection unit among two adjacent in-place detection units is connected to the power supply terminal one of the other in-place detection unit. The power supply terminal one of the first in-place detection unit is connected to the first power supply terminal of the power supply module. The second power supply terminals of all in-place detection units are all connected to the second power supply terminal. The signal terminal of the last in-place detection unit is connected to the signal receiving terminal of the drive unit;

[0040] The signal output terminal of the drive unit can be connected to an alarm, and an in-place alarm is issued according to the signal of the signal terminal;

[0041] The signal terminal is a voltage signal. When the moving part is not in place, the voltage value of the signal terminal is the same as the voltage value of the first power supply terminal. When the moving part is in place, the voltage value of the signal terminal is different from the voltage value of the first power supply terminal.

[0042] One of the first power supply terminal and the second power supply terminal is the positive power supply terminal, and the other is the negative power supply terminal.

[0043] It further includes a warning light. A first branch is provided on the connection line between two adjacent in-place detection units. The first branch is connected to the warning light and then connected to the second power supply terminal. When the moving part is in place, the voltage value of the signal terminal is the same as the voltage value of the second power supply terminal.

[0044] The in-place detection unit is a three-wire limit switch; the power supply module is a power supply, adopting a bearing DC regulated power supply, with a supply voltage of 24V, and the model is CE A75 - 220S24 (but not limited to this).

[0045] When the first power supply terminal is the positive power supply terminal, during normal use, when the limit switch signal terminal outputs a high-level signal, it means not in place, and when any limit switch signal terminal outputs a low-level signal, it means in place; if a certain limit switch fails and continuously outputs a low-level in-place signal, the subsequent limit switches also output low-level in-place signals in sequence, and the alarm module controls the motor of the transmission mechanism to stop rotating for timely maintenance; if a certain limit switch fails and continuously outputs a high-level not-in-place signal, the subsequent limit switches work normally through the high level. When a low-level in-place signal appears in the subsequent limit switches, the alarm module can control the motor to stop rotating, ensuring that the motor stops rotating as much as possible after the moving part is in place. When a single limit switch fails, it does not affect the normal use, improving the overall reliability of the system and greatly reducing the accident risk and potential safety hazards;

[0046] Similarly, when the power supply terminal 1 is the negative power supply terminal, during normal use, a low-level signal output from the limit switch signal terminal indicates not in place, and a high-level signal output from any limit switch signal terminal indicates in place; if a certain limit switch other than the last one fails and continuously outputs a low-level in-place signal, when the subsequent connected limit switch outputs a high-level signal indicating in place, the alarm module recognizes and gives an in-place prompt, greatly reducing the accident risk. If a certain limit switch fails and continuously outputs a high-level in-place signal, the alarm module issues an in-place signal based on the high-level signal and promptly repairs the faulty limit switch.

[0047] On the other hand, as Figure 1 , Figure 2 shown, the present application proposes a limit alarm device for a synchronous transmission mechanism, including a plurality of limit switches and a power supply. Taking a three-wire normally closed limit switch as an example for illustration, its three-wire pin definitions are as follows: pin 1 is +V, brown wire; pin 2 is the signal output, black wire; pin 3 is 0V, blue wire. The working principle of the three-wire PNP normally closed limit switch is: in the normal power-on state (pin 1 is connected to the positive power supply, pin 3 is connected to the negative power supply), the output of pin 2 with reference to the negative power supply of pin 3 is a high-level signal; when a limit is triggered, the output of pin 2 with reference to the negative power supply of pin 3 is a low-level signal.

[0048] Step 1: Connect the limit switches to the corresponding moving parts and install and fix them. Precise position measurement can be carried out through devices such as a laser tracker, and each limit switch should be installed at an equivalent position on the corresponding moving part as much as possible to achieve the effect of triggering basically simultaneously. Appropriate errors are allowed here, which do not affect the device and method.

[0049] Step 2: Connect the multiple limit switches to each other. Connect pin 2 of the first limit switch to pin 1 of the second limit switch, and connect pin 3 of the first limit switch to pin 3 of the second limit switch; connect pin 2 of the second limit switch to pin 1 of the third limit switch, and connect pin 3 of the second limit switch to pin 3 of the third limit switch; and so on, and connect them in sequence according to the actual required quantity.

[0050] Step 3: Connect the multiple limit switches that have been connected to the power supply. The pin definitions of the power supply are: pin 1 is V+, and pin 2 is V-. First, connect pin 1 of the power supply to pin 1 of the first limit switch, and then connect pin 2 of the power supply to pin 3 of all the limit switches together.

[0051] Step 4: Connect the indicator lights to determine the specific position where the limit occurs. Connect the positive pole of each indicator light to the 2-pin of the corresponding limit switch, and the negative pole of the indicator light to the 3-pin of the limit switch. When there is no limit normally, all the indicator lights are on; when a limit occurs, the corresponding indicator light will go out. Due to the design of the series connection method in the present invention, the specific position where the limit occurs can be judged according to Table 1.

[0052] Table 1 Basis for Judging the Position where the Limit Occurs

[0053]

[0054]

[0055] Step 5: Connect the signal acquisition terminal of the driver. First, connect the 2-pin of the last limit switch in series to the DI0 port of the signal acquisition channel of the driver, and then connect the 3-pin of the limit switch to the COM port of the signal acquisition channel of the driver. Finally, perform the setting of the limit acquisition channel of the driver. The specific setting is: when a high level is acquired, it is determined that the limit is not triggered, and when a low level is acquired, it is determined that the limit is triggered.

[0056] If a three-wire PNP normally closed limit switch is used, after the first-stage limit switch is powered on and works, the output signal of the first-stage limit switch can be used as the power supply excitation for the second-stage limit switch, and the output signal of the second-stage limit switch can be used as the power supply excitation for the third-stage limit switch, and so on. When a limit alarm occurs, the output signal of the limit switch at this level is 0V, then the next-stage limit switch loses the power supply excitation, and its output signal will also be 0V after losing the power supply excitation, and so on. Therefore, the output of the last-stage limit switch is also 0V. In this way, the acquisition terminal can detect the change process of the signal from high level to 0V, and based on this, the moving mechanism can respond normally.

[0057] As Figure 2 shown, the upper limit 1, upper limit 2, and upper limit 3 are configured with a set of synchronous transmission mechanism limit alarm devices to determine the upper limit positions of each moving part in the transmission mechanism. The lower limit 1, lower limit 2, and lower limit 3 are configured with a set of synchronous transmission mechanism limit alarm devices to determine the lower limit positions of each moving part in the transmission mechanism. After the driver obtains the signal that the transmission mechanism reaches the upper limit position, it controls the motor to reverse. After the driver obtains the signal that the transmission mechanism reaches the lower limit position, it controls the motor to reverse again to realize the up and down reciprocating motion of the transmission mechanism.

[0058] Set indicator lights between the output signal of each stage and the power supply negative pole, and judge the specific position where the limit occurs according to the on / off rules of all the indicator lights.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A synchronous in-place detection circuit for detecting signals of multiple moving components in a synchronous transmission mechanism when they are in place, characterized in that: It includes a power supply module, a driving unit, and multiple in-place detection units. One in-place detection unit is correspondingly set for each in-place position of the moving parts. The in-place detection unit includes a first power supply terminal, a second power supply terminal, and a signal terminal. The power supply module includes a first power supply terminal and a second power supply terminal; The multiple in-place detection units are connected in sequence. The signal terminal of one in-place detection unit among two adjacent in-place detection units is connected to the first power supply terminal of the other in-place detection unit. The first power supply terminal of the first in-place detection unit is connected to the first power supply terminal of the power supply module. The second power supply terminals of all in-place detection units are connected to the second power supply terminal. The signal terminal of the last in-place detection unit is connected to the signal receiving end of the driving unit; The signal terminal is a voltage signal. When the moving part is not in place, the voltage value of the signal terminal is the same as the voltage value of the first power supply terminal. When the moving part is in place, the voltage value of the signal terminal is different from the voltage value of the first power supply terminal.

2. The synchronous in-place detection circuit according to claim 1, wherein: One of the first power supply terminal and the second power supply terminal is the positive power supply terminal, and the other is the negative power supply terminal.

3. The synchronous in-place detection circuit according to claim 1, characterized in that: It includes a warning light. A first branch is provided on the connection line between two adjacent in-place detection units. The first branch is connected to the warning light and then to the second power supply terminal. When the moving part is in place, the voltage value of the signal terminal is the same as the voltage value of the second power supply terminal.

4. Synchronous drive mechanism limit alarm device, used to detect signals of multiple moving parts in the synchronous drive mechanism being in place synchronously, characterized in that: It includes a power supply module, a driver, and multiple limit switches. One limit switch is correspondingly set for each in-place position of the moving parts. The limit switch includes a first power supply terminal, a second power supply terminal, and a signal terminal. The power supply module includes a first power supply terminal and a second power supply terminal; The multiple limit switches are connected in sequence. The signal terminal of one limit switch among two adjacent limit switches is connected to the first power supply terminal of the other limit switch. The first power supply terminal of the first limit switch is connected to the first power supply terminal of the power supply module. The second power supply terminals of all limit switches are connected to the second power supply terminal. The signal terminal of the last limit switch is connected to the signal receiving end of the driver; The signal output end of the driver is connected to the motor. The motor synchronously drives the multiple moving parts to move in the same direction. The driver drives the motor to rotate according to the signal of the signal terminal; The signal terminal is a voltage signal. When the moving part is not in place, the voltage value of the signal terminal is the same as the voltage value of the first power supply terminal. When the driver receives the signal that the moving part is not in place, it controls the motor to keep working normally. When the moving part is in place, the voltage value of the signal terminal is different from the voltage value of the first power supply terminal. When the driver receives the signal that the moving part is in place, it controls the motor to stop rotating or reverse.

5. The limit alarm device for the synchronous transmission mechanism according to claim 4, characterized in that: One of the first power supply terminal and the second power supply terminal is the positive power supply terminal, and the other is the negative power supply terminal.

6. The limit alarm device for the synchronous transmission mechanism according to claim 5, wherein: It includes a warning light. A first branch is provided on the connection line between two adjacent limit switches. The first branch is connected to the warning light and then to the second power supply terminal. When the moving part is in place, the voltage value of the signal terminal is the same as the voltage value of the second power supply terminal.

7. The limit alarm device for the synchronous transmission mechanism according to claim 4, characterized in that: The positions where the multiple moving parts reach in place synchronously are on the same straight line. When all the limit switches are installed, the positions where the multiple moving parts reach in place synchronously are simultaneously irradiated by a laser tracker. The in-place detection switches are installed according to the irradiation points of the laser on each synchronous in-place position.

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