Compact type hot cover pressing balance transmission device

Abstract

The utility model discloses a compact type hot cover pressing balance transmission device which comprises a motor driving wheel, a first guide wheel, a hot cover driving wheel, a second guide wheel, a synchronous belt, a base of a hot cover, a movable piece of the hot cover, a driving lead screw, a driving motor and a motor driver. According to the utility model, the output torque of the driving motor can be uniformly transmitted to the two driving screw rods which are distributed diagonally, and the two driving screw rods synchronously move to drive the movable part of the hot cover to move up and down, so that the hot cover is closed and opened in a sealing manner; therefore, the problem that a rubber strip used for sealing and used for the bottom of the heat cover is uneven in stress when the heat cover is pressed tightly can be solved. Besides, due to the structure, the driving motor can be arranged on one side of the base of the heat cover, so that all components of the device are distributed in the horizontal direction, the whole structure is compact, the occupied space in the vertical direction is smaller, and the device is suitable for a small-size PCR instrument.

Description

Technical Field

[0001] The utility model relates to the technical field of PCR amplification instruments, in particular to a compact hot cover pressing balance transmission device. Background Art

[0002] In a PCR amplification instrument, when a sample tray assembly for placing samples needs to be heated, a heat cover needs to be tightly covered on the sample tray assembly first, and a rubber strip is provided at the bottom of the heat cover to form a seal for the sample tray assembly.

[0003] Chinese patent application CN114015561A discloses a PCR fluorescence detection temperature control system, including a temperature rise and fall module and a heat cover assembly. The heat cover assembly includes a fixed plate and a heat cover that can be covered on the fixed plate, and reaction through holes are provided in the reaction area corresponding to the reaction seat, and a heating device is provided on the heat cover corresponding to the reaction area. When the sample needs to be placed, the heat cover is opened, and when working normally, the heat cover is pressed, and the rubber strip on the heat cover can form a sealed area with the fixed plate, so that the temperature of the area where the sample tray is located can be maintained. In this scheme, the heat cover is arranged with hinges on one side and opened by flipping, which will affect the life of the sealing rubber strip. Since the heat cover is opened on one side, during the opening and closing process, the rubber strip close to the hinge is stressed first and has a larger deformation. Therefore, this uneven force mode will affect the life of the rubber strip.

[0004] CN217973205U discloses an incubation component of a PCR amplification detection device, including a heating seat, a cover plate, and a heating element; wherein the gland assembly includes a lifting mechanism, a first pressure block, a second pressure block, a plurality of first guide pillars, and a plurality of springs; the gland assembly is driven by a through-type motor, and the gland moves up and down through a screw drive, and is guided by a plurality of guide pillars. In this scheme, the motor is located at the center of the gland assembly, drives the screw to move up and down, and is guided by a guide pillar, which can achieve pressure balance of the sealing strip. However, this configuration requires the motor shaft to be located at the center of the gland and placed vertically, resulting in a large space occupied in the vertical axis (height) direction of the hot cover. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model aims to provide a compact hot cover pressing balance transmission device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A compact heat cover pressing and balancing transmission device comprises a motor driving wheel, a guide wheel 1, a heat cover driving wheel, a guide wheel 2, a synchronous belt, a base of the heat cover, a movable part of the heat cover, a driving screw, a driving motor and a motor driver; the heat cover driving wheel, the guide wheel 2 and the guide wheel 1 are symmetrically arranged on both sides of the motor driving wheel; the synchronous belt passes around the motor driving wheel, and its two ends pass around the guide wheel 1, the heat cover driving wheel and the guide wheel 2 on the corresponding side in turn to form a closed state; the guide wheel 1, the heat cover driving wheel and the guide wheel 2 are all rotatably connected to the base of the heat cover through bearings; the motor driving wheel is drivingly connected to the output shaft of the driving motor, and the motor driver is used to control the driving motor;

[0008] The movable part of the heat cover is located below the base of the heat cover, each heat cover driving wheel is tightly connected with a driving screw, each driving screw is threadedly connected to the movable part of the heat cover and can drive the movable part of the heat cover to move linearly up and down.

[0009] Furthermore, the motor drive wheel, the first guide wheel, the heat cover drive wheel, the second guide wheel and the synchronous belt together form a concave symmetrical structure with the motor drive wheel as the center.

[0010] Furthermore, guide wheel one is a smooth guide wheel, guide wheel two is a toothed guide wheel, one side of the synchronous belt is a toothed surface, and the other side is a smooth surface, the motor drive wheel contacts the toothed surface of the synchronous belt, guide wheel one contacts the smooth surface of the synchronous belt, and the hot cover drive wheel and guide wheel two both contact the toothed surface of the synchronous belt.

[0011] Furthermore, an elongated circular hole is provided on the base of the thermal cover, and the motor driving wheel is connected to the inner cavity of the elongated circular hole and can move along the elongated circular hole.

[0012] Furthermore, the thermal cover pressing balance transmission device also includes a guide rod and a guide groove; the guide groove is fixedly arranged on the base of the thermal cover, the guide rod is fixedly installed on the movable part of the thermal cover, and the upper end of the guide rod extends into the guide groove and can move up and down along the guide groove.

[0013] Furthermore, guide grooves are provided on both sides of the base of the thermal cover, and guide rods are provided at positions corresponding to the movable parts of the thermal cover.

[0014] The beneficial effect of the utility model is that the output torque of the driving motor can be evenly transmitted to the two driving screws distributed diagonally by using the utility model, and the two driving screws move synchronously, driving the movable parts of the thermal cover to move up and down, realizing the closed and opened state of the thermal cover sealing, and solving the problem that the rubber strip used for sealing at the bottom of the thermal cover is subjected to uneven force when the thermal cover is pressed. In addition, the structure of the utility model allows the driving motor to be set on one side of the base of the thermal cover, so that the various components of the device are distributed in the horizontal direction, the overall structure is compact, and the space occupied in the vertical direction is smaller, which is suitable for small-volume PCR instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the structure of the hot cover pressing balance transmission device in Example 1 of the utility model;

[0016] Figure 2 It is a three-dimensional schematic diagram of a hot cover pressing balance transmission device from one side in Example 1 of the utility model;

[0017] Figure 3 It is a three-dimensional schematic diagram of the hot cover pressing balance transmission device in Example 1 of the utility model from another side perspective;

[0018] Figure 4 This is a schematic diagram of the hot cover pressing balance transmission device in Example 2 of the utility model applied to a PCR amplification instrument (hot cover lifted state);

[0019] Figure 5 This is a schematic diagram of the application of the hot cover pressing balance transmission device in Example 2 of the utility model in a PCR amplification instrument (hot cover under the cover). DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0021] Example 1

[0022] This embodiment provides a compact heat cover pressing balance transmission device, such as Figure 1-3As shown, it includes a motor driving wheel 1, a guide wheel 1, a heat cover driving wheel 3, a guide wheel 2, a synchronous belt 5, a base 6 of the heat cover, a movable part 7 of the heat cover and a driving screw 8; the heat cover driving wheel 3, the guide wheel 2 4 and the guide wheel 1 2 are symmetrically arranged on both sides of the motor driving wheel 1; after the synchronous belt 5 passes around the motor driving wheel 1, its two ends respectively pass around the guide wheel 1 2, the heat cover driving wheel 3 and the guide wheel 2 4 on the corresponding side and form a closed structure, and the motor driving wheel 1, the guide wheel 1 2, the heat cover driving wheel 3, the guide wheel 2 4 and the synchronous belt 5 together form a concave symmetrical structure with the motor driving wheel 1 as the center; the guide wheel 1 2, the heat cover driving wheel 3 and the guide wheel 2 4 are rotatably connected to the base 6 of the heat cover through bearings; the motor driving wheel 1 is drivingly connected to the output shaft of the driving motor 11, and the motor driver 12 controls the driving motor 11 to move according to the operation instruction;

[0023] The movable part 7 of the heat cover is located below the base 6 of the heat cover, and each heat cover driving wheel 3 is fastened with a driving screw 8, and each driving screw 8 is threadedly connected to the movable part 7 of the heat cover and can drive the movable part 7 of the heat cover to move linearly up and down. When the heat cover driving wheel 3 rotates, the driving screw 8 rotates at the same speed as the heat cover driving wheel 3, thereby driving the movable part 7 of the heat cover to form an up and down linear motion.

[0024] It should be noted that the motor drive wheel 1, guide wheel 1 2, heat cover drive wheel 3, guide wheel 2 4 and synchronous belt 5 together form a concave symmetrical structure with the motor drive wheel 1 as the center. The output shaft of the drive motor is located in the middle position, and the power is transmitted symmetrically to both ends, so that the driving force is decomposed into two forces that are synchronized in time, balanced in space and of the same size to ensure balance.

[0025] In this embodiment, guide wheel 1 2 is a smooth guide wheel, guide wheel 2 4 is a toothed guide wheel, one side of the synchronous belt 5 is a toothed surface, and the other side is a smooth surface, the motor drive wheel 1 is in contact with the toothed surface of the synchronous belt 5, the guide wheel 1 2 is in contact with the smooth surface of the synchronous belt 5, and the hot cover drive wheel 3 and guide wheel 2 4 are both in contact with the toothed surface of the synchronous belt 5.

[0026] In the above structure, the functions of the guide wheel 1 2 and the guide wheel 2 4 are to change the direction of the synchronous belt so that the hot cover driving wheel 3 and the synchronous belt 5 form a large wrap angle to meet the requirement of sufficient torque transmission.

[0027] In this embodiment, in order to form a pre-tightening force on the synchronous belt 5, an elongated circular hole is provided on the base 6 of the thermal cover, and the motor drive wheel 1 is connected to the inner cavity of the elongated circular hole and can move along the elongated circular hole. By adjusting the position of the motor drive wheel 1 in the elongated circular hole, the pre-tightening of the synchronous belt 5 can be achieved.

[0028] like Figure 2As shown, the heat cover pressing balance transmission device also includes a guide rod 9 and a guide groove 10; the guide groove 10 is fixedly arranged on the base 6 of the heat cover, the guide rod 9 is fixedly installed on the movable part 7 of the heat cover, and the upper end of the guide rod 9 extends into the guide groove 10 and can move up and down along the guide groove 10. Through the arrangement of the guide rod 9 and the guide groove 10, the movement balance of the movable part 7 of the heat cover can be achieved.

[0029] Furthermore, in this embodiment, guide grooves 10 are provided on both sides of the base 6 of the thermal cover, and guide rods 9 are provided at positions corresponding to the movable parts 7 of the thermal cover. The moving pairs formed by the two sets of thermal cover driving wheels 3 and the driving screw 8 and the moving pairs formed by the guide grooves 10 on both sides and the guide rods 9 together form a 4-point guide, forming a quadrilateral structure with good balance and guidance.

[0030] When the output shaft of the driving motor 11 drives the motor driving wheel 1 to rotate, the rotational motion is distributed to the heat cover driving wheels 3 on both sides through the synchronous belt 5, thereby driving the movable part 7 of the heat cover to move up and down, thereby realizing the action of pressing the heat cover.

[0031] In this embodiment, the driving motor 11 is disposed on one side of the base 6 of the thermal cover.

[0032] Example 2

[0033] This embodiment provides an application example of the hot cover pressing balance transmission device described in Example 1 on a PCR amplification instrument.

[0034] like Figure 4-5 As shown, the hot cover pressing balance transmission device 101 is installed on the PCR amplification instrument, and the sample tray assembly 102 is directly below the hot cover pressing balance transmission device 101. The hot cover pressing balance transmission device 101 drives the movable part 7 of the hot cover to move up and down, so that the movable part 7 of the hot cover can be covered on the sample tray assembly 102 or lifted from the sample tray assembly, thereby realizing the sealing and opening two states of the sample tray assembly. In addition, the sample tray assembly 102 needs to be sampled, so it needs to be connected with the sample loading moving assembly 103. When it is necessary to load samples, the sample tray assembly is pulled out, and when it is in the working state, the sample tray returns to the hot cover pressing balance transmission device 101. The base part of the sample loading moving assembly 103 is fixedly connected to the whole machine base 104, and the base 6 of the hot cover is fixedly connected to the whole machine base 104. The above structure can realize the up and down movement of the hot cover and the forward and backward movement of the sample tray, which can meet the sample loading and detection tasks of the PCR amplification instrument.

[0035] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the utility model.

Claims

1. A compact hot cover pressing balance transmission device, characterized in that: The invention comprises a motor drive wheel (1), a guide wheel 1 (2), a heat cover drive wheel (3), a guide wheel 2 (4), a synchronous belt (5), a heat cover base (6), a movable part (7) of the heat cover, a drive screw (8), a drive motor (11) and a motor driver (12); the heat cover drive wheel (3), the guide wheel 2 (4) and the guide wheel 1 (2) are symmetrically arranged on both sides of the motor drive wheel (1); the synchronous belt (5) passes around the motor drive wheel (1), and its two ends respectively pass around the guide wheel 1 (2), the heat cover drive wheel (3) and the guide wheel 2 (4) on the corresponding side in sequence to form a closed loop; the guide wheel 1 (2), the heat cover drive wheel (3) and the guide wheel 2 (4) are all rotatably connected to the heat cover base (6) via bearings; the motor drive wheel (1) is drivingly connected to the output shaft of the drive motor (11), and the motor driver (12) is used to control the drive motor (11); The movable part (7) of the heat cover is located below the base (6) of the heat cover, and each heat cover driving wheel (3) is tightly connected to a driving screw (8), and each driving screw (8) is threadedly connected to the movable part (7) of the heat cover and can drive the movable part (7) of the heat cover to move linearly up and down.

2. The hot cover pressing balance transmission device according to claim 1, characterized in that: The motor drive wheel (1), the first guide wheel (2), the heat cover drive wheel (3), the second guide wheel (4) and the synchronous belt (5) together form a concave symmetrical structure with the motor drive wheel (1) as the center.

3. The hot cover pressing balance transmission device according to claim 1, characterized in that: The guide wheel 1 (2) is a smooth guide wheel, the guide wheel 2 (4) is a toothed guide wheel, one side of the synchronous belt (5) is a toothed surface, and the other side is a smooth surface, the motor drive wheel (1) contacts the toothed surface of the synchronous belt (5), the guide wheel 1 (2) contacts the smooth surface of the synchronous belt (5), and the hot cover drive wheel (3) and the guide wheel 2 (4) both contact the toothed surface of the synchronous belt (5).

4. The hot cover pressing balance transmission device according to claim 1, characterized in that: An elongated circular hole is provided on the base (6) of the heat cover, and the motor driving wheel (1) is connected to the inner cavity of the elongated circular hole and can move along the elongated circular hole.

5. The hot cover pressing balance transmission device according to claim 1, characterized in that: It also comprises a guide rod (9) and a guide groove (10); the guide groove (10) is fixedly arranged on the base (6) of the thermal cover, the guide rod (9) is fixedly installed on the movable part (7) of the thermal cover, and the upper end of the guide rod (9) extends into the guide groove (10) and can move up and down along the guide groove (10).

6. The hot cover pressing balance transmission device according to claim 5, characterized in that: Both sides of the base (6) of the thermal cover are provided with guide grooves (10), and corresponding positions of the movable parts (7) of the thermal cover are provided with guide rods (9).

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