Constant-temperature incubator

Abstract

The utility model relates to the technical field of incubators and discloses a constant-temperature incubator which comprises an incubator body, a cavity with an outward opening is arranged in the incubator body, a cabinet door is arranged at the opening of the cavity, a placing plate is arranged in the cavity, and a heating device is arranged at the upper end of the incubator body. Limiting plates are arranged on the opposite side walls of the cavity, a plurality of fixing holes are oppositely formed in the opposite side walls of the box body, a mounting groove is formed in the containing plate, communicating grooves corresponding to the fixing holes are formed in the opposite side walls of the mounting groove, positioning pins are arranged in the communicating grooves, and a driving mechanism is arranged in the mounting groove. Through the structure, one end of the positioning pin slides out of the corresponding fixing hole through the driving mechanism, positioning of the placing plate on the limiting plate can be relieved, a worker can take out a culture dish on the placing plate from the cavity at a time by driving the placing plate to slide on the limiting plate, and therefore long-time opening of the cabinet door is avoided; and meanwhile, the energy consumption of the heating device is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of incubators, in particular to a constant temperature incubator. Background Art

[0002] A constant temperature incubator (incubator for short) is a general term for a type of constant temperature chamber. The temperature inside the incubator is raised through an electric heating system. Workers generally place the microorganisms, plant or animal cells that need to be cultured in a culture dish, and then place the culture dish in a constant temperature incubator to culture the microorganisms, plant or animal cells at a constant temperature.

[0003] For example, the electric constant temperature incubator disclosed in the patent with publication number CN212199295U, although during the use of the electric constant temperature incubator, the culture dish placed on the placement plate is placed between the first arc seat and the second arc seat constituting the clamping limit frame, the culture dish can be clamped and fixed under the elastic force of the spring, so that multiple culture dishes placed on the placement plate at the same time will not collide with each other. However, when the electric constant temperature incubator is actually used, the placement plate is fixed, which makes it impossible for the staff to take out all the culture dishes on the placement plate at one time. Therefore, the incubator can only be taken out by the staff one by one by the culture dishes clamped on the placement plate, which causes the sealed door of the incubator to be opened for a long time, resulting in a large amount of heat loss in the incubator body, thereby increasing the energy consumption of the incubator. Utility Model Content

[0004] The purpose of the utility model is to provide a constant temperature incubator to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A constant temperature incubator comprises a box body, a cavity with an opening facing outward is arranged in the box body, a cabinet door which can be opened and closed is arranged at the opening of the cavity, a plurality of placement plates for placing culture dishes are arranged in the cavity, a heating device for controlling the temperature in the cavity is arranged at the upper end of the box body; limiting plates for supporting corresponding placement plates are arranged on opposite side walls of the cavity, a plurality of fixing holes are arranged on opposite side walls of the box body, mounting grooves are arranged in the placement plates, connecting grooves are arranged on the side walls opposite to the mounting grooves corresponding to the fixing holes, a retractable positioning pin which can be inserted into the corresponding fixing hole is arranged in the connecting groove, and a driving mechanism for driving the positioning pin to be relatively retracted is arranged in the mounting groove.

[0007] Preferably, the positioning pin includes a rack, one end of which is provided with a fixing rod that can be inserted into the corresponding fixing hole 211, and the side walls opposite to the mounting groove are provided with driving grooves connected to the corresponding connecting grooves, and the bottom wall of the driving groove is provided with a rotatable mounting rod, and the mounting rod is respectively sleeved with a first gear and a second gear from top to bottom, and the second gear is meshed with the rack;

[0008] The driving mechanism includes a movable plate arranged in the installation groove, and the opposite side walls of the movable plate are provided with tooth grooves meshing with the corresponding second gear. The installation groove is also provided with a first pushing component and a second pushing component. The first pushing component is used to drive the tooth groove on the movable plate to move downward, insert the fixing rod on the rack into the corresponding fixing hole, and realize the positioning of the placement plate in the cavity. The second pushing component is used to drive the movable plate to move upward, and slide the fixing rod on the rack out of the corresponding fixing hole.

[0009] Preferably, the first pushing assembly includes a spring arranged on the rear side of the movable plate, the spring is used to push the movable plate to move downward, and drive the tooth groove on the movable plate to move downward, insert the fixing rod on the rack into the corresponding fixing hole, and realize the positioning of the placement plate in the cavity.

[0010] Preferably, a mounting plate is provided on the front side of the movable plate;

[0011] The second pushing assembly includes a rotatable driving gear arranged in the mounting groove, a swing rod is arranged on the side wall of the driving gear, a hinge plate is arranged between the swing rod and the mounting plate, and two ends of the hinge plate are respectively hinged on the mounting plate and the swing rod. The driving gear drives the swing rod to swing, and drives the hinge plate to push the mounting plate on the movable plate up, so that the fixing rod on the rack slides out of the corresponding fixing hole, thereby releasing the positioning of the placement plate in the cavity.

[0012] Preferably, a first plug hole and a second plug hole are respectively formed at both ends of the hinged plate, a mounting block inserted into the first plug hole is provided on the mounting plate, and a swing block inserted into the second plug hole is provided on the swing rod.

[0013] Preferably, a slide groove connected to the mounting groove is opened on the front side surface of the placement plate along its length direction, a movable rack meshing with the driving gear and slidable is provided in the mounting groove, and a shift block with one end extending out of the slide groove is provided on the movable rack.

[0014] Preferably, circular holes are provided on the opposite side walls of the mounting groove, and round rods are provided at both ends of the movable rack to be inserted into the corresponding circular holes.

[0015] Preferably, a positioning hole is provided on the side wall of the installation groove, a positioning rod with one end inserted into the positioning hole is provided on the rear side wall surface of the movable plate, and the spring sleeve is provided on the positioning rod.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model can release the positioning of the placement plate on the limit plate by sliding one end of the positioning pin out of the corresponding fixing hole through the driving mechanism, so that the staff can drive the placement plate to slide on the limit plate to take out the culture dishes on the placement plate from the cavity at one time. Compared with the existing ones, this kind of constant temperature incubator can avoid the long-term opening of the cabinet door during actual use, and can take out all the culture dishes on the placement plate, thereby reducing the loss of heat in the cavity and reducing the energy consumption of the heating device.

[0018] 2. The utility model sets the spring on the positioning rod and limits the spring, so that the spring can better push the moving plate to move downward. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of a constant temperature incubator in the utility model.

[0020] Figure 2 It is a structural schematic diagram of the box body in the utility model.

[0021] Figure 3 It is a schematic diagram of the internal structure of the placement plate in the utility model.

[0022] Figure 4 It is a structural schematic diagram of the movable plate in the utility model.

[0023] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0024] The meaning of the symbols in the figure is:

[0025] 1. Control box; 100. Box body; 101. Cavity; 120. Placement board; 140. Cabinet door;

[0026] 200, limit plate; 211, fixing hole;

[0027] 301, mounting groove; 302, connecting groove; 310, rack; 311, fixed rod; 320, moving plate; 330, spring; 340, driving gear; 341, swing rod; 350, hinged plate; 361, mounting block; 362, swing block; 370, shifting block; 380, moving rack; 381, round rod;

[0028] 400, tooth groove; 410, mounting plate; 421, slide groove; 430, positioning rod;

[0029] 501, driving slot; 510, mounting rod; 511, first gear; 512, second gear; 520, supporting plate. DETAILED DESCRIPTION

[0030] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.

[0031] The following is combined with Figure 1-Figure 5 This embodiment is described in further detail.

[0032] like Figure 1-5 As shown, a constant temperature incubator in this embodiment includes a box body 100, a cavity 101 with an opening facing outward is provided in the box body 100, a cabinet door 140 that can be opened and closed is provided at the opening of the cavity 101, a plurality of placement plates 120 for placing culture dishes are provided in the cavity 101, and a heating device for controlling the temperature in the cavity 101 is provided at the upper end of the box body 100; limiting plates 200 for supporting the corresponding placement plates 120 are provided on the opposite side walls of the cavity 101, a plurality of fixing holes 211 are relatively provided on the opposite side walls of the box body 100, a mounting groove 301 is provided in the placement plate 120, a connecting groove 302 is provided on the side wall opposite to the mounting groove 301 corresponding to the fixing hole 211, a retractable positioning pin that can extend into the corresponding fixing hole 211 is provided in the connecting groove 302, and a driving mechanism for driving the positioning pin to be relatively retracted is provided in the mounting groove 301.

[0033] In actual use, the heating device of this embodiment can adopt the structure of patent number CN212199295U, which includes an electric heating tube embedded in the rear side wall of the cavity 101 and a temperature sensor installed on the opposite side wall of the cavity 101. The heating device also includes a control box 1 arranged at the top of the box 100, and a PLC controller electrically connected to the electric heating tube and the temperature sensor is arranged in the control box 1. A display screen and control buttons electrically connected to the PLC controller are embedded on the front side of the control box 1; the user can set the temperature through the control button, and the temperature sensor collects the temperature in the cavity 101 and transmits it to the PLC controller. The PLC controller automatically controls the working power of the electric heating tube according to the temperature set by the user, so that the temperature is automatically adjusted to achieve constant temperature cultivation;

[0034] The limiting plate 200 is fixedly installed in the cavity 101, and the two ends of the placing plate 120 are overlapped and slid on the limiting plate 200 to realize the sliding installation of the placing plate 120 in the cavity 101. When the placing plate 120 slides onto the limiting plate 200, the positioning pin is driven by the driving mechanism to retract and retract, so that one end of the positioning pin is inserted into or slides out of the corresponding fixing hole 211, so that the placing plate 120 can be positioned or released in the cavity 101 corresponding to the sliding of the limiting plate 200. When the sliding of the placing plate 120 is positioned, It can prevent the placement plate 120 from sliding in the cavity 101, causing the culture dishes on the placement plate 120 to shake in the cavity 101, thereby affecting actual use. When it is necessary to take out all the culture dishes on the placement plate 120, the placement plate 120 can be released from the position limiting plate 200 by sliding one end of the positioning pin out of the corresponding fixing hole 211 through the driving mechanism, so that the staff can drive the placement plate 120 to slide on the limiting plate 200 to take out the culture dishes on the placement plate 120 from the cavity 101 at one time;

[0035] Among them, a cabinet door 140 for closing the cavity 101 is hingedly installed at the opening of the box 100. When the culture dish is cultured on the placement plate 120, the cabinet door 140 closes the cavity 101, thereby preventing dust outside the box 100 from entering the cavity 101 and affecting the culture of microorganisms in the culture dish. At the same time, the cabinet door 140 can also reduce the loss of heat in the cavity 101, so that the temperature in the cavity 101 is maintained at a constant temperature under the action of the heating device.

[0036] When it is necessary to take out all the culture dishes on the placement plate 120, the cabinet door 140 is opened first, and one end of the positioning pin is slid out of the corresponding fixing hole 211 through the driving mechanism, so that the positioning of the placement plate 120 on the limiting plate 200 can be released, so that the staff can drive the placement plate 120 to slide on the limiting plate 200, and the culture dishes on the placement plate 120 can be taken out from the cavity 101 at one time. Compared with the existing ones, this kind of constant temperature incubator can avoid the long-term opening of the cabinet door 140 during actual use, that is, when all the culture dishes on the placement plate 120 are taken out, thereby reducing the heat loss in the cavity 101, thereby reducing the energy consumption of the heating device;

[0037] When it is actually used, a plurality of plates 120 for placing culture dishes are installed in the cavity 101 .

[0038] like Figure 1-5As shown, in this embodiment, the positioning pin includes a rack 310, and a fixing rod 311 that can be inserted into the corresponding fixing hole 211 is provided at one end of the rack 310, and a driving groove 501 connected to the corresponding connecting groove 302 is provided on the opposite side walls of the installation groove 301, and a rotatable installation rod 510 is provided on the bottom wall of the driving groove 501. The installation rod 510 is respectively sleeved with a first gear 511 and a second gear 512 from top to bottom, and the second gear 512 is meshed with the rack 310;

[0039] The driving mechanism includes a movable plate 320 arranged in the installation groove 301, and the opposite side walls of the movable plate 320 are provided with tooth grooves 400 meshing with the corresponding second gear 512. The installation groove 301 is also provided with a first pushing component and a second pushing component. The first pushing component is used to drive the tooth groove 400 on the movable plate 320 to move downward, insert the fixing rod 311 on the rack 310 into the corresponding fixing hole 211, and realize the positioning of the placement plate 120 in the cavity 101. The second pushing component is used to drive the movable plate 320 to move upward, and slide the fixing rod 311 on the rack 310 out of the corresponding fixing hole 211.

[0040] In this embodiment, by setting the rack 310, the positioning rod 430, the driving groove 501, the mounting rod 510, the first gear 511, the second gear 512, the movable plate 320, the tooth groove 400, the first pushing assembly and the second pushing assembly, the first gear 511 and the second gear 512 are fixedly mounted on the mounting rod 510, and the fixing rod 311 is fixedly mounted on the rack 310. When the movable plate 320 moves in the mounting groove 301, the tooth groove 400 on the movable plate 320 drives the second gear 512 to rotate. When the second gear 512 rotates, it drives the mounting rod 510 to rotate, that is, the first gear 511 rotates, thereby driving the rack 310 to slide in the connecting groove 302, inserting one end of the fixing rod 311 into or sliding out of the corresponding fixing hole 211, so as to realize the positioning or release of the placement plate 120 in the cavity 101.

[0041] The upper and lower ends of the mounting rod 510 are mounted on the side walls of the driving groove 501 through bearings, so that the mounting rod 510 is rotatably mounted in the driving groove 501. A support plate 520 is fixedly mounted at a position between the first gear 511 and the second gear 512 in the driving groove 501, so that the rotation of the mounting rod 510 in the driving rod is more stable, thereby making the rotation of the first gear 511 and the second gear 512 more stable.

[0042] The first pushing assembly is used to drive the moving plate 320 to move downward (i.e., the moving plate 320 moves toward the cabinet door 140), thereby driving the second gear 512 to rotate, so that the mounting rod 510 drives the first gear 511 to rotate, and the fixing rod 311 on the rack 310 is driven by the first gear 511 to be inserted into the fixing hole 211, so as to realize the positioning of the placement plate 120 in the cavity 101;

[0043] Among them, the second pushing assembly is used to drive the movable plate 320 to move upward (that is, the movable plate 320 moves in a direction away from the cabinet door 140), thereby driving the second gear 512 to rotate, so that the mounting rod 510 drives the first gear 511 to rotate, and then the fixing rod 311 on the rack 310 is driven by the first gear 511 to slide out of the fixing hole 211, so as to realize the release of the positioning of the placement plate 120 in the cavity 101.

[0044] like Figure 1-4 As shown, in this embodiment, the first pushing assembly includes a spring 330 arranged on the rear side of the movable plate 320, and the spring 330 is used to push the movable plate 320 to move downward, and drive the tooth groove 400 on the movable plate 320 to move downward, and insert the fixing rod 311 on the rack 310 into the corresponding fixing hole 211 to realize the positioning of the placement plate 120 in the cavity 101.

[0045] In this embodiment, the spring 330 is provided so that the moving plate 320 is always pushed downward by the spring 330, so that the fixing rod 311 on the rack 310 is always located in the corresponding fixing hole 211, that is, the placement plate 120 is continuously positioned in the cavity 101;

[0046] When it is actually used, a positioning hole is opened on the side wall of the installation groove 301, and a positioning rod 430 with one end inserted into the positioning hole is fixedly installed on the rear side wall of the movable plate 320. The spring 330 is sleeved on the positioning rod 430 so that the spring 330 on the positioning rod 430 is limited, thereby avoiding shaking of the spring 330 in the installation groove 301, affecting the downward push of the spring 330 on the movable plate 320. During the movement of the movable plate 320, the positioning rod 430 does not separate from the positioning hole, thereby enabling the spring 330 to be better installed.

[0047] like Figure 1-3As shown, in this embodiment, a mounting plate 410 is provided on the front side of the movable plate 320; the second pushing component includes a rotatable driving gear 340 which is arranged in the mounting groove 301, a swing rod 341 is provided on the side wall of the driving gear 340, a hinge plate 350 is provided between the swing rod 341 and the mounting plate 410, and two ends of the hinge plate 350 are respectively hinged on the mounting plate 410 and the swing rod 341. The driving gear 340 drives the swing rod 341 to swing, and drives the hinge plate 350 to push the mounting plate 410 on the movable plate 320 to move upward, so that the fixing rod 311 on the rack 310 slides out of the corresponding fixing hole 211, thereby releasing the positioning of the placement plate 120 in the cavity 101.

[0048] In this embodiment, by setting the mounting plate 410, the driving gear 340, the swing rod 341 and the hinge plate 350, the mounting plate 410 is fixedly mounted on the movable plate 320, and the swing rod 341 is fixedly mounted on the driving gear 340. When the driving gear 340 rotates, the driving gear 340 can drive one end of the swing rod 341 to swing along the driving gear 340. Through the hinge connection at both ends of the hinge plate 350, the swing rod 341 is swung through the hinge plate 350 to drive the mounting plate 410 to move upward, that is, the movable plate 320 moves upward, thereby driving the fixed tube on the rack 310 to slide out of the corresponding fixed hole 211, and releasing the positioning of the placement plate 120 in the cavity 101.

[0049] The hinged plate 350 has a first plug hole and a second plug hole at both ends thereof, a mounting block 361 inserted into the first plug hole is fixedly mounted on the mounting plate 410, and a swing block 362 inserted into the second plug hole is fixedly mounted on the swing rod 341, so that the hinged plate 350 is hingedly connected between the mounting plate 410 and the swing rod 341. When the swing rod 341 drives the swing block 362 to swing, the swing block 362 can drive the mounting plate 410 to move upward through the hinged plate 350, that is, the movable plate 320 moves upward.

[0050] In actual use, convex shafts are fixedly installed on the upper side and the lower side of the driving gear 340 , and the two convex shafts are respectively inserted into the side walls of the installation groove 301 , thereby realizing the rotatable installation of the driving gear 340 in the installation groove 301 .

[0051] like Figure 1-4 As shown, in this embodiment, a slide groove 421 connecting to the mounting groove 301 is opened on the front side surface of the placement plate 120 along its length direction, and a movable rack 380 that meshes with the driving gear 340 and can slide is provided in the mounting groove 301, and a shift block 370 is provided on the movable rack 380, one end of which extends out of the slide groove 421.

[0052] In this embodiment, by setting the slide groove 421, the moving rack 380 and the shift block 370, the shift block 370 is fixedly mounted on the moving rack 380. When the shift block 370 is driven to slide along the slide groove 421, the shift block 370 can drive the moving rack 380 to move, thereby realizing the rotation of the driving gear 340, that is, the swing rod 341 swings, and drives the moving plate 320 to move upward;

[0053] In actual use, circular holes are opened on the opposite side walls of the installation groove 301, and round rods 381 inserted into the corresponding circular holes are fixedly installed at both ends of the movable rack 380. By inserting the round rods 381 into the corresponding circular holes, the sliding installation of the movable rack 380 in the installation groove 301 is realized, so that the movable rack 380 can only slide along the circular holes, thereby better driving the driving gear 340 to rotate.

[0054] Working principle: First, place the microorganisms to be cultured in the culture dish, and then place multiple culture dishes on the placement plate 120 for culture. When the cavity 101 is closed by the cabinet door 140, the heating device is started to heat the cavity 101 so that the temperature in the cavity 101 reaches the set temperature, thereby facilitating the culture of the microorganisms in the culture dish. When the microorganisms in the culture dish are cultured, it is necessary to take multiple culture dishes out from the placement plate 120. By opening the cabinet door 140, the driving block 370 slides along the slide groove 421, driving the moving rack 380 to move, so that the driving gear 340 drives the swing rod 341 to swing, and the swing rod 341 swings, driving the hinged plate 350 to push the mounting plate 410 moves up, that is, the moving plate 320 moves up, so that the tooth groove 400 on the moving plate 320 drives the second gear 512 to rotate, and the rotation of the second gear 512 drives the first gear 511 on the mounting rod 510 to rotate, so that the first gear 511 rotates to drive the rack 310 to move, and the fixing rod 311 on the rack 310 slides out of the corresponding fixing hole 211, thereby releasing the positioning of the placement plate 120 in the cavity 101, and finally, the staff pulls the placement plate 120 to slide along the limit plate 200 to slide the placement plate 120 out of the cavity 101, that is, the multiple culture dishes on the placement plate 120 can be quickly taken out of the cavity 101, thereby reducing the heat loss in the cavity 101, that is, reducing the energy consumption of the heating device.

[0055] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A constant temperature incubator, characterized in that: The invention comprises a box body (100), wherein a cavity (101) with an opening facing outward is provided in the box body (100), a cabinet door (140) which can be opened and closed is provided at the opening of the cavity (101), a plurality of placement plates (120) for placing culture dishes are provided in the cavity (101), and a heating device for controlling the temperature in the cavity (101) is provided at the upper end of the box body (100); and opposite side walls of the cavity (101) are provided with a heating device for supporting corresponding placement plates (120). A limiting plate (200) is provided with a plurality of fixing holes (211) on the side walls opposite to the box body (100), a mounting groove (301) is provided in the placement plate (120), a connecting groove (302) is provided on the side wall opposite to the mounting groove (301) and corresponding to the fixing hole (211), a positioning pin which is retractable and can extend into the corresponding fixing hole (211) is provided in the connecting groove (302), and a driving mechanism for driving the positioning pin to be relatively retracted is provided in the mounting groove (301).

2. A constant temperature incubator according to claim 1, characterized in that: The positioning pin comprises a rack (310), one end of which is provided with a fixing rod (311) which can be inserted into a corresponding fixing hole (211), side walls opposite to the mounting groove (301) are provided with driving grooves (501) which are connected with the corresponding connecting groove (302), a rotatable mounting rod (510) is provided on the bottom wall of the driving groove (501), and the mounting rod (510) is respectively sleeved with a first gear (511) and a second gear (512) from top to bottom, and the second gear (512) is meshed with the rack (310); The driving mechanism comprises a moving plate (320) arranged in the installation groove (301), and opposite side walls of the moving plate (320) are provided with tooth grooves (400) meshing with the corresponding second gear (512). The installation groove (301) is also provided with a first pushing component and a second pushing component. The first pushing component is used to drive the tooth groove (400) on the moving plate (320) to move downward, insert the fixing rod (311) on the rack (310) into the corresponding fixing hole (211), and realize the positioning of the placement plate (120) in the cavity (101). The second pushing component is used to drive the moving plate (320) to move upward, and slide the fixing rod (311) on the rack (310) out of the corresponding fixing hole (211).

3. A constant temperature incubator according to claim 2, characterized in that: The first pushing assembly includes a spring (330) disposed on the rear side of the movable plate (320), the spring (330) being used to push the movable plate (320) to move downward, and to drive the tooth groove (400) on the movable plate (320) to move downward, so as to insert the fixing rod (311) on the rack (310) into the corresponding fixing hole (211), thereby realizing the positioning of the placement plate (120) in the cavity (101).

4. A constant temperature incubator according to claim 3, characterized in that: A mounting plate (410) is provided on the front side of the movable plate (320); The second pushing assembly includes a rotatable driving gear (340) disposed in the mounting groove (301), a swing rod (341) being disposed on the side wall of the driving gear (340), a hinge plate (350) being disposed between the swing rod (341) and the mounting plate (410), and two ends of the hinge plate (350) being hinged to the mounting plate (410) and the swing rod (341), respectively. The driving gear (340) drives the swing rod (341) to swing, and drives the hinge plate (350) to push the mounting plate (410) on the movable plate (320) upward, so that the fixing rod (311) on the rack (310) slides out of the corresponding fixing hole (211), thereby releasing the positioning of the placement plate (120) in the cavity (101).

5. A constant temperature incubator according to claim 4, characterized in that: A first plug hole and a second plug hole are respectively formed at the two ends of the hinge plate (350); a mounting block (361) inserted into the first plug hole is provided on the mounting plate (410); and a swing block (362) inserted into the second plug hole is provided on the swing rod (341).

6. A constant temperature incubator according to claim 4, characterized in that: A slide groove (421) communicating with the mounting groove (301) is provided on the front side surface of the placement plate (120) along its length direction; a movable rack (380) slidably meshing with the driving gear (340) is provided in the mounting groove (301); and a shifting block (370) is provided on the movable rack (380) with one end extending out of the slide groove (421).

7. A constant temperature incubator according to claim 6, characterized in that: Circular holes are provided on opposite side walls of the mounting groove (301), and round rods (381) are provided at both ends of the movable rack (380) and are inserted into the corresponding circular holes.

8. A constant temperature incubator according to claim 7, characterized in that: A positioning hole is provided on the side wall of the installation groove (301), a positioning rod (430) having one end inserted into the positioning hole is provided on the rear side wall surface of the movable plate (320), and the spring (330) is sleeved on the positioning rod (430).

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