Start-up control circuit for a spect device and spect device

Abstract

The application relates to the field of SPECT technology, and particularly discloses a starting control circuit for a SPECT device and the SPECT device, which comprises a first normally open switch, a normally closed switch group, a first control component for controlling the first normally open switch to be closed when power is obtained, so that two control contacts of the SPECT device are interconnected and the starting of the SPECT device is triggered, a second normally open switch, and a second control component which is electrically connected with the other end of a remote switch and the negative electrode of a power supply and is used for controlling at least one normally closed switch in the normally closed switch group to be kept open and the second normally open switch to be closed when power is obtained; when the remote switch is closed, the second control component obtains power, and when the remote switch is switched from the closed state to the open state, the second normally open switch is opened, so that the SPECT device is triggered to stop running; the circuit can allow the SPECT device to be directly started without the participation of the remote switch when the SPECT device is locally debugged or maintained.

Description

Technical Field

[0001] This utility model belongs to the field of SPECT technology, and specifically relates to a start-up control circuit for SPECT equipment and SPECT equipment. Background Technology

[0002] refer to Figure 1 SPECT devices based on related technologies will remotely switch on / off ( Figure 1 K in the middle), control contact ( Figure 1 D1 and D2) and the emergency stop button ( Figure 1 The J in the circuit is connected in series. The emergency stop button is a normally closed contact, and the remote switch is a normally open contact. The relevant technology requires that the remote control terminal be powered on first, and then the remote control terminal be used to control the remote switch to close in order for the SPECT device to start normally. That is, the remote control terminal needs to be powered on synchronously when the SPECT device starts.

[0003] In applications where local SPECT devices are powered on for debugging or routine maintenance without requiring remote control console power-on, engineers need to short-circuit the remote switch to enable the SPECT device to start normally. Therefore, this technology suffers from insufficient convenience in debugging or maintaining the SPECT device, and the remote control console cannot control the SPECT device to stop running and the remote control function fails if the remote switch is not uncircuited after debugging or maintenance is completed.

[0004] Therefore, the existing technology needs improvement and development. It should be noted that the information disclosed in this section is only for understanding the background of the present invention, and therefore may include information that does not constitute prior art. Utility Model Content

[0005] The purpose of this application is to provide a start-up control circuit for SPECT equipment and SPECT equipment, which can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT equipment to stop running and the remote control function fails because the short circuit of the remote switch is not released after debugging or maintenance is completed.

[0006] In a first aspect, this application provides a startup control circuit for a SPECT device, wherein the SPECT device can be remotely controlled to operate or stop, and a power supply is provided to provide power when the SPECT device is powered on. The startup control circuit for the SPECT device includes: The first normally open switch has its two ends electrically connected to the two control contacts of the SPECT device, respectively; A normally closed switch group, electrically connected to the positive terminal of the power supply, includes multiple normally closed switches connected in series; The first control component is electrically connected to the normally closed switch group and the negative terminal of the power supply, and is used to control the first normally open switch to close when energized, so as to interconnect the two control contacts of the SPECT device and trigger the SPECT device to start. The second normally open switch is electrically connected to the positive terminal of the power supply and the first control component; The second control component is electrically connected to the other end of the remote switch and the negative terminal of the power supply, and is used to control at least one normally closed switch in the normally closed switch group to open and remain open when energized, and to control the second normally open switch to close. When the remote switch is closed, the second control component is energized. When the remote switch switches from the closed state to the open state, the second normally open switch opens to trigger the SPECT device to stop operating.

[0007] This application provides a start-up control circuit for SPECT equipment, which allows the SPECT equipment to be started directly without the involvement of a remote switch when it is being debugged or maintained locally. That is, this application does not require the remote switch to be short-circuited when debugging or maintaining the SPECT equipment. Therefore, this application can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT equipment to stop running and the remote control function fails because the remote switch is not uncircuited after debugging or maintenance is completed.

[0008] Furthermore, the second control component includes a first control unit, a second control unit, a third normally open switch, and a fourth normally open switch. One end of the third normally open switch is electrically connected to the positive terminal of the power supply and one end of the fourth normally open switch, and the other end of the third normally open switch is electrically connected to the negative terminal of the power supply and the other end of the fourth normally open switch. The two ends of the second control unit are electrically connected to a remote switch and the negative terminal of the power supply, respectively. When the remote switch is closed, the second control unit is energized and controls the second and fourth normally open switches to close, so as to energize the first control unit and to control the third normally open switch to close and control at least one normally closed switch in the normally closed switch group to open.

[0009] Furthermore, the normally closed switch group includes a first normally closed switch and a second normally closed switch. One end of the first normally closed switch is connected to one end of the second normally open switch and the positive terminal of the power supply. The other end of the first normally closed switch is electrically connected to one end of the second normally closed switch. The other end of the second normally closed switch is electrically connected to the other end of the second normally open switch and the first control component. The first control unit is used to control the first normally closed switch to open when energized. The second control unit is also used to control the second normally closed switch to open when energized.

[0010] Furthermore, the first control unit includes a first relay, a first normally closed switch being a normally closed contact of the first relay, and a third normally open switch being a normally open contact of the first relay.

[0011] Furthermore, the second control unit includes a second relay, a second normally closed switch being the normally closed contact of the second relay, and a second normally open switch and a fourth normally open switch being two sets of normally open contacts of the second relay, respectively.

[0012] Furthermore, the first control component includes a third relay, and the first normally open switch is the normally open contact of the third relay.

[0013] Furthermore, the power supply voltage is 24V.

[0014] Secondly, the present invention provides a SPECT device, which includes a start-up control circuit for the SPECT device as described in the first aspect above.

[0015] Furthermore, the SPECT device also includes an emergency stop control assembly, the two ends of which are electrically connected to a first normally open switch and one of the control contacts, respectively. The emergency stop control assembly is used to disconnect the two control contacts in the event of an emergency.

[0016] As can be seen from the above, the starting control circuit and SPECT device provided by this utility model allow the SPECT device to be started directly without the participation of a remote switch when it is debugged or maintained locally. That is, this application does not require the remote switch to be short-circuited when debugging or maintaining the SPECT device. Therefore, this application can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT device to stop running and the remote control function fails because the remote switch is not uncircuited after debugging or maintenance is completed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing SPECT device.

[0018] Figure 2 This is a schematic diagram of a startup control circuit for a SPECT device and a connection of the SPECT device, provided as an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of a startup control circuit for a SPECT device provided in an embodiment of this application.

[0020] Labeling Explanation: KY, Remote Switch; J, Emergency Stop Control Component; VCC, Positive; CM, Negative; KO1, First Normally Open Switch; KO2, Second Normally Open Switch; KO3, Third Normally Open Switch; KO4, Fourth Normally Open Switch; KB1, First Normally Closed Switch; KB2, Second Normally Closed Switch; K1, First Control Unit; K2, Second Control Unit; K3, First Control Component. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] The following disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0023] Firstly, such as Figure 2 and Figure 3 As shown, Figure 2 C1 and C2 are both contacts of the remote switch KY. Figure 2 D1 and D2 are both control contacts of the SPECT device. This application provides a start-up control circuit for a SPECT device. The SPECT device can be controlled to run or stop by a remote switch KY. One end of the remote switch KY is connected to the positive terminal VCC of the power supply. The power supply provides power when the SPECT device is powered on. The start-up control circuit for the SPECT device includes: The first normally open switch KO1 is electrically connected at both ends to the two control contacts of the SPECT device. A normally closed switch group, electrically connected to the positive terminal VCC of the power supply, includes multiple normally closed switches connected in series. The first control component K3 is electrically connected to the normally closed switch group and the negative terminal CM of the power supply. It is used to control the first normally open switch KO1 to close when energized, so as to interconnect the two control contacts of the SPECT device and trigger the SPECT device to start. The second normally open switch KO2 is electrically connected to the positive terminal VCC of the power supply and the first control component K3; The second control component is electrically connected to the other end of the remote switch KY and the negative terminal CM of the power supply, and is used to control at least one normally closed switch in the normally closed switch group to open and remain open when energized, and to control the second normally open switch KO2 to close. When the remote switch KY is closed, the second control component is energized. When the remote switch KY switches from the closed state to the open state, the second normally open switch KO2 is opened to trigger the SPECT device to stop operating.

[0024] The SPECT (Single Photon Emission Computed Tomography) device of this embodiment is an existing medical imaging device. This SPECT device has two control contacts and a power supply terminal (not shown in the figure). The power supply terminal provides the electrical energy required for the operation of the SPECT device. When the two control contacts are interconnected, the SPECT device starts; when the two control contacts switch from interconnected to disconnected, the SPECT device switches from the started state to the stopped state. The remote switch KY in this embodiment refers to a switch capable of remotely controlling the operating state of the SPECT device. Specifically, the remote switch KY is normally in the open state, and those skilled in the art can control the closing or opening of the remote switch KY using existing remote control terminals. The power supply of this embodiment provides the electrical energy required for the operation of the start-up control circuit of the SPECT device. This power supply has a positive terminal VCC and a negative terminal CM. The first normally open switch KO1 and the second normally open switch KO2 in this embodiment are both switches that are in the open state when not subjected to external forces. When subjected to external forces, both the first normally open switch KO1 and the second normally open switch KO2 will change from the open state to the closed state. The normally closed switch group in this embodiment consists of multiple normally closed switches connected in series. A normally closed switch is a switch that is closed when not subjected to external force, and changes from closed to open when subjected to external force. In this embodiment, both the first control component K3 and the second control component are modules capable of controlling the operation of other circuit elements based on received electrical signals. Specifically, energizing the first control component K3 and the second control component is equivalent to receiving a high-level signal.

[0025] The startup control circuit for a SPECT device provided in this application includes several key components that work together to achieve flexible control of the SPECT device. First, the two ends of a first normally open switch KO1 are electrically connected to two control contacts of the SPECT device. This first normally open switch KO1 can be a normally open contact of a solid-state relay. In this embodiment, the first normally open switch KO1 is turned on by using a control signal to close the normally open contact of the solid-state relay, thereby interconnecting the two control contacts of the SPECT device. Second, a normally closed switch group is electrically connected to the positive terminal VCC of the power supply. Since the normally closed switch group consists of multiple normally closed switches connected in series, this embodiment only needs to open any one of the normally closed switches in the group to put the group in an open-circuit state. Furthermore, the first control component K3 is electrically connected to the normally closed switch group and the negative terminal CM of the power supply. The first control component K3 is used to control the closure of the first normally open switch KO1 when energized, so as to interconnect the two control contacts of the SPECT device and trigger the SPECT device to start. The first control component K3 can be an electromagnetic relay, with one end of its coil connected to a normally closed switch group and the other end connected to the negative terminal CM of the power supply. When the normally closed switch group is closed and the power supply is normal, the relay coil is energized, thereby driving its normally open contact to close, and thus controlling the closure of the first normally open switch KO1. The second normally open switch KO2 is electrically connected to the positive terminal VCC of the power supply and the first control component K3. The second normally open switch KO2 can also be a normally open contact of a solid-state relay. In this embodiment, the second normally open switch KO2 can be turned on by using a control signal to close the normally open contact of the solid-state relay, so as to interconnect the two control contacts of the SPECT device. When the second normally open switch KO2 is closed, the power supply can supply power to the first control component K3 through the second normally open switch KO2. Finally, the second control component is electrically connected to the other end of the remote switch KY and the negative terminal CM of the power supply. That is, the power supply of this embodiment can only supply power to the second control component when the remote switch KY is closed. The second control component is used to control at least one normally closed switch in the normally closed switch group to remain open and the second normally open switch KO2 to close when energized. Specifically, the second control component can be a programmable logic controller (PLC), whose input terminal is connected to the other end of the remote switch KY and whose output terminal is connected to the normally closed switch group and the second normally open switch KO2. When the remote switch KY is closed, the PLC is energized and controls at least one normally closed switch in the normally closed switch group to remain open and the second normally open switch KO2 to close according to a preset program.

[0026] The startup control circuit for SPECT devices provided in this application aims to address the inconvenience of starting up existing SPECT devices in local debugging and maintenance scenarios, as well as the risk of remote control function failure. Its working principle is as follows: When the SPECT device is powered on, the power supply provides power to the entire circuit. Since the positive terminal VCC of the power supply is connected to one end of the first control component K3 through a normally closed switch group, and the other end of the first control component K3 is connected to the negative terminal CM of the power supply, and all normally closed switches in the normally closed switch group are initially closed, the first control component K3 is energized when the SPECT device is powered on. At this time, the first control component K3 controls the first normally open switch KO1 to close, thereby interconnecting the two control contacts of the SPECT device and triggering the SPECT device startup. When remote control of the SPECT device is required, the remote switch KY is closed. Since the two ends of the remote switch KY are electrically connected to the positive terminal VCC of the power supply and the second control component, when the remote switch KY is closed, the power supply supplies power to the second control component through the remote switch KY. The second control component controls at least one normally closed switch in the normally closed switch group to remain open and controls the second normally open switch KO2 to close. At this time, the normally closed switch group is in an open circuit state. The power supply supplies power to the first control component K3 through the second normally open switch KO2, which is switched to the closed state. If the remote switch KY is opened at this time, the second normally open switch KO2 will switch back to the open state, and the power supply cannot supply power to the first control component K3 (i.e., the first control component K3 is de-energized). The first normally open switch KO1 switches from the closed state to the open state, the two control contacts of the SPECT device are disconnected, and the SPECT device switches from the start state to the stop state, thereby realizing the use of the remote switch KY to control the SPECT device to stop operation.

[0027] Therefore, the start-up control circuit for SPECT equipment provided in this application allows the SPECT equipment to be started directly without the involvement of the remote switch KY when it is being debugged or maintained locally. That is, this application does not require the remote switch KY to be short-circuited when debugging or maintaining the SPECT equipment. Therefore, this application can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT equipment to stop running and the remote control function fails because the remote switch KY is not released after debugging or maintenance is completed.

[0028] In some preferred embodiments, the second control component includes a first control unit K1, a second control unit K2, a third normally open switch KO3, and a fourth normally open switch KO4. One end of the third normally open switch KO3 is electrically connected to the positive terminal VCC of the power supply and one end of the fourth normally open switch KO4. The other end of the third normally open switch KO3 is electrically connected to the negative terminal CM of the power supply and the other end of the fourth normally open switch KO4. The two ends of the second control unit K2 are electrically connected to a remote switch KY and the negative terminal CM of the power supply, respectively. When the remote switch KY is closed, the second control unit K2 is energized and controls the second normally open switch KO2 and the fourth normally open switch KO4 to close, so that the first control unit K1 is energized and the first control unit K1 controls the third normally open switch KO3 to close and controls at least one normally closed switch in the normally closed switch group to open. Since the first control unit K1 in this embodiment can control the third normally open switch KO3 to close and control at least one normally closed switch in the normally closed switch group to open after being powered on, and when the second control unit K2 is powered on, both the third normally open switch KO3 and the fourth normally open switch KO4 will switch to the closed state, even if the remote switch KY switches from the closed state to the open state (the second control unit K2 is de-energized, and the fourth normally open switch KO4 is de-energized), the power supply of this embodiment can still supply power to the first control unit K1 through the third normally open switch KO3 in the closed state, so that at least one normally closed switch in the normally closed switch group remains open after the remote switch KY switches from the closed state to the open state, thereby ensuring the effective operation of the remote control function.

[0029] In some preferred embodiments, the normally closed switch group includes a first normally closed switch KB1 and a second normally closed switch KB2. One end of the first normally closed switch KB1 is connected to one end of the second normally open switch KO2 and the positive terminal VCC of the power supply. The other end of the first normally closed switch KB1 is electrically connected to one end of the second normally closed switch KB2. The other end of the second normally closed switch KB2 is electrically connected to the other end of the second normally open switch KO2 and a first control component K3. The first control unit K1 is used to control the first normally closed switch KB1 to open when energized, and the second control unit K2 is also used to control the second normally closed switch KB2 to open when energized. This embodiment is equivalent to all normally closed switches in the normally closed switch group being in the open state when the remote switch KY is closed.

[0030] In some preferred embodiments, the first control unit K1 includes a first relay, a first normally closed switch KB1 as the normally closed contact of the first relay, and a third normally open switch KO3 as the normally open contact of the first relay. The first relay in this embodiment is a common electrical control device. Its working principle is that when the input quantity (such as current or voltage) reaches a specified value, the contacts are actuated through electromagnetic effect, thereby realizing the on / off control of the circuit. This first controller can be an existing electromagnetic relay or a solid-state relay. Because relays have advantages such as simple structure, stable operation, fast response speed, and good electrical isolation, this embodiment can effectively improve the reliability and safety of the startup control circuit for the SPECT device by selecting the first relay as the first control unit K1. It should be understood that after the SPECT device is stopped using the remote switch KY, the power supply stops supplying power to the startup control circuit for the SPECT device, the first relay is de-energized, and the third normally open switch KO3 returns from the closed state to the open state.

[0031] In some preferred embodiments, the second control unit K2 includes a second relay, a second normally closed switch KB2 which is the normally closed contact of the second relay, and a second normally open switch KO2 and a fourth normally open switch KO4 which are two sets of normally open contacts of the second relay, respectively. The second relay in this embodiment is preferably the same as the first relay in the above embodiments. Because relays have advantages such as simple structure, stable operation, fast response speed, and good electrical isolation, this embodiment can effectively improve the reliability and safety of the startup control circuit for SPECT equipment by selecting the second relay as the second control unit K2.

[0032] In some preferred embodiments, the first control component K3 includes a third relay, and the first normally open switch KO1 is the normally open contact of the third relay. The second relay in this embodiment is preferably the same as the first relay in the above embodiments. Since relays have advantages such as simple structure, stable operation, fast response speed, and good electrical isolation, this embodiment can effectively improve the reliability and safety of the start-up control circuit for SPECT equipment by selecting a third relay as the first control component K3.

[0033] In some preferred embodiments, the power supply voltage is 24V. This embodiment enables the power supply voltage to be compatible with widely available industrial control components and electronic components by setting the power supply voltage to 24V, effectively simplifying circuit design and component selection. Furthermore, this embodiment ensures that all electrical components in the SPECT device's startup control circuit operate under optimal conditions by setting the power supply voltage to 24V, thereby improving the stability, reliability, and safety of the entire SPECT device startup control system.

[0034] As can be seen from the above, the start-up control circuit for SPECT equipment provided in this application allows the SPECT equipment to be started directly without the involvement of the remote switch KY when it is debugged or maintained locally. That is, this application does not require the remote switch KY to be short-circuited when debugging or maintaining the SPECT equipment. Therefore, this application can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT equipment to stop running and the remote control function fails because the remote switch KY is not released after debugging or maintenance is completed.

[0035] Secondly, the present invention provides a SPECT device, which includes a start-up control circuit for the SPECT device as described in the first aspect above.

[0036] This application provides a SPECT device, which includes the startup control circuit for the SPECT device provided in the first aspect above. The principle of the SPECT device provided in this embodiment is the same as that of the startup control circuit for the SPECT device provided in the first aspect above, and will not be discussed in detail here.

[0037] In some preferred embodiments, the SPECT device further includes an emergency stop control component J. The two ends of the emergency stop control component J are electrically connected to a first normally open switch KO1 and one of the control contacts, respectively. The emergency stop control component J is used to disconnect the two control contacts in an emergency. The emergency stop control component J in this embodiment is a safety device specifically designed for emergency situations, aiming to provide a rapid and direct shutdown method to cope with unexpected or dangerous operating conditions. This embodiment enables the SPECT device to stop operating in an emergency by introducing the emergency stop control component J. Specifically, in an emergency, the emergency stop control component J is activated, stopping the SPECT device by de-interconnecting the two control contacts, ensuring that the SPECT device can be stopped quickly and reliably in an emergency, thereby effectively avoiding accidental damage caused by delayed shutdown of the SPECT device in an emergency.

[0038] In some preferred embodiments, the emergency stop control component J includes a third normally closed switch. In this embodiment, the third normally closed switch is a switch whose contacts are closed when not subjected to external action. When the emergency stop control component J is activated (e.g., by external operation or when an emergency is detected by a sensor), the contacts of the third normally closed switch are forcibly opened, thereby disconnecting the two control contacts of the SPECT device.

[0039] As can be seen from the above, the starting control circuit and SPECT device provided by this utility model allow the SPECT device to be started directly without the involvement of the remote switch KY when it is debugged or maintained locally. That is, this application does not require the remote switch KY to be short-circuited when debugging or maintaining the SPECT device. Therefore, this application can effectively improve the convenience of equipment debugging or maintenance and effectively solve the problem that the remote control console cannot control the SPECT device to stop running and the remote control function fails because the remote switch KY is not short-circuited after debugging or maintenance is completed.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A start-up control circuit for a SPECT device, the SPECT device being operable or stopped by a remote switch, one end of the remote switch being electrically connected to the positive terminal of a power supply, the power supply providing power when the SPECT device is powered on, characterized in that, The startup control circuit for the SPECT device includes: The first normally open switch has its two ends electrically connected to the two control contacts of the SPECT device, respectively. A normally closed switch group, electrically connected to the positive terminal of the power supply, includes multiple normally closed switches connected in series. The first control component is electrically connected to the normally closed switch group and the negative terminal of the power supply, and is used to control the first normally open switch to close when energized, so as to interconnect the two control contacts of the SPECT device and trigger the SPECT device to start. The second normally open switch is electrically connected to the positive terminal of the power supply and the first control component; The second control component is electrically connected to the other end of the remote switch and the negative terminal of the power supply, and is used to control at least one normally closed switch in the normally closed switch group to open and remain open when energized, and to control the second normally open switch to close. When the remote switch is closed, the second control component is energized; when the remote switch switches from the closed state to the open state, the second normally open switch opens to trigger the SPECT device to stop operating.

2. The start-up control circuit for a SPECT device according to claim 1, characterized in that, The second control component includes a first control unit, a second control unit, a third normally open switch, and a fourth normally open switch. One end of the third normally open switch is electrically connected to the positive terminal of the power supply and one end of the fourth normally open switch. The other end of the third normally open switch is electrically connected to the negative terminal of the power supply and the other end of the fourth normally open switch. The two ends of the second control unit are respectively electrically connected to the other end of the remote switch and the negative terminal of the power supply. When the remote switch is closed, the second control unit is energized and controls the second normally open switch and the fourth normally open switch to close, so that the first control unit is energized and controls the third normally open switch to close and controls at least one normally closed switch in the normally closed switch group to open.

3. The start-up control circuit for a SPECT device according to claim 2, characterized in that, The normally closed switch group includes a first normally closed switch and a second normally closed switch. One end of the first normally closed switch is connected to one end of the second normally open switch and the positive terminal of the power supply. The other end of the first normally closed switch is electrically connected to one end of the second normally closed switch. The other end of the second normally closed switch is electrically connected to the other end of the second normally open switch and the first control component. The first control unit is used to control the first normally closed switch to open when energized. The second control unit is also used to control the second normally closed switch to open when energized.

4. The start-up control circuit for a SPECT device according to claim 3, characterized in that, The first control unit includes a first relay, the first normally closed switch is the normally closed contact of the first relay, and the third normally open switch is the normally open contact of the first relay.

5. A start-up control circuit for a SPECT device according to claim 3, characterized in that, The second control unit includes a second relay, the second normally closed switch is the normally closed contact of the second relay, and the second normally open switch and the fourth normally open switch are two sets of normally open contacts of the second relay, respectively.

6. A start-up control circuit for a SPECT device according to claim 1, characterized in that, The first control component includes a third relay, and the first normally open switch is the normally open contact of the third relay.

7. A start-up control circuit for a SPECT device according to claim 1, characterized in that, The voltage of the power supply is 24V.

8. A SPECT device, characterized in that, The SPECT device includes a startup control circuit for the SPECT device as described in any one of claims 1-7.

9. A SPECT device according to claim 8, characterized in that, The SPECT device also includes an emergency stop control component, the two ends of which are electrically connected to the first normally open switch and one of the control contacts, respectively. The emergency stop control component is used to disconnect the two control contacts in the event of an emergency.

10. A SPECT device according to claim 9, characterized in that, The emergency stop control component includes a third normally closed switch.

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