A breathing waveform simulation device

Abstract

The breathing waveform simulation device disclosed in the utility model includes: a cylinder, the cylinder includes an air inlet and outlet for connecting a ventilator; a screw nut transmission mechanism, the piston rod of the cylinder is connected to the transmission nut of the screw nut transmission mechanism, and the screw of the screw nut transmission mechanism is rotationally connected to the cylinder; a driving mechanism, the driving mechanism is transmission-connected to the screw nut transmission mechanism; a guide mechanism, the guide mechanism is connected to the screw nut transmission mechanism through the transmission nut, and is used to prevent the piston rod from rotating. The breathing waveform simulation device disclosed in the embodiment of the utility model has a simple structure and is easy to operate. The screw nut transmission mechanism is used to drive the piston rod to move back and forth. Compared with the crank rocker mechanism, the dead point is eliminated, and the stability and reliability of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment detection, in particular to a breathing waveform simulation device. Background Art

[0002] In the ventilator detection, there is a test item that simulates the change pattern of the volume of breathing gas is a sine wave. The existing breathing simulation device produces a breathing airflow through the crank rocker mechanism and the piston rod of the cylinder. The breathing airflow is a sine wave, but there is a dead point in the transmission process of the crank rocker mechanism, resulting in poor working reliability.

[0003] Therefore, how to design a respiratory waveform simulation device to improve its working reliability is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a breathing waveform simulation device to improve the reliability of its operation.

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

[0006] A breathing waveform simulation device, comprising:

[0007] A gas cylinder, the gas cylinder including an inlet and an outlet for connecting to a ventilator;

[0008] A screw-nut transmission mechanism, wherein the piston rod of the cylinder is connected to the transmission nut of the screw-nut transmission mechanism, and the screw of the screw-nut transmission mechanism is rotationally connected to the cylinder;

[0009] A driving mechanism, the driving mechanism is drivingly connected to the lead screw nut transmission mechanism;

[0010] The guide mechanism is connected to the lead screw nut transmission mechanism through a transmission nut and is used to prevent the piston rod from rotating.

[0011] Optionally, in the above-mentioned breathing waveform simulation device, the guiding mechanism includes:

[0012] A fixing part, a driving nut is fixed on the fixing part, and a piston rod is fixed on the fixing part;

[0013] A first guide rod, one end of which is fixed on the fixing member, and the other end of which extends into the cylinder and is slidably matched with the cylinder.

[0014] Optionally, in the above-mentioned breathing waveform simulation device, the guiding mechanism includes:

[0015] A support member, the support member is arranged opposite to the cylinder, and the lead screw is rotatably connected to the support member;

[0016] A second guide rod, one end of which is fixed to the cylinder, and the other end of which is fixed to the support member, and an extending direction of the second guide rod is parallel to an axial direction of the piston rod;

[0017] The sliding block and the transmission nut are fixed on the sliding block, the piston rod and the sliding block are detachably connected, and the sliding block and the second guide rod are slidably matched.

[0018] Optionally, in the above-mentioned breathing waveform simulation device, the number of the second guide rods is two, and the lead screw is arranged between the two second guide rods.

[0019] Optionally, in the above-mentioned breathing waveform simulation device, a groove for fixing the piston rod is provided on the sliding block, and the piston rod is fixed to the groove by a fastener.

[0020] Optionally, in the above-mentioned breathing waveform simulation device, the driving mechanism includes:

[0021] Drive motor;

[0022] A first pulley, the first pulley is fixedly connected to the output shaft of the driving motor;

[0023] A second pulley, the second pulley is fixedly connected to the lead screw;

[0024] A belt is connected to the first pulley and the second pulley through a belt transmission.

[0025] Optionally, the above-mentioned breathing waveform simulation device also includes a control mechanism, and the control mechanism is electrically connected to the driving motor.

[0026] Optionally, in the above-mentioned breathing waveform simulation device, a position detection element is provided on the first end cover of the cylinder, and the position detection element is electrically connected to the control mechanism.

[0027] Optionally, in the above-mentioned breathing waveform simulation device, a rotation speed measurement mechanism is also included, and the rotation speed measurement mechanism includes:

[0028] A rotary encoder, wherein the rotary encoder is arranged on the lead screw;

[0029] An encoder reader, the rotary encoder is connected to the encoder reader, and the encoder reader is electrically connected to the control mechanism;

[0030] A speed measuring mechanism support, an encoder reader is arranged on the speed measuring mechanism support, a lead screw is rotatably connected to the speed measuring mechanism support, and a second pulley is arranged between the speed measuring mechanism support and the support member;

[0031] The rotation speed measuring mechanism housing is covered on the outside of the rotary encoder and the encoder reading head.

[0032] Optionally, the above-mentioned breathing waveform simulation device also includes a base plate assembly, which includes a bottom plate and a bottom foot arranged on the bottom plate, and the cylinder, support, drive motor and speed measurement mechanism support are all arranged on the bottom plate.

[0033] The breathing waveform simulation device disclosed in the embodiment of the utility model has a simple structure and is easy to operate. It adopts a screw nut transmission mechanism to drive the piston rod to move back and forth. Compared with the crank rocker mechanism, it eliminates the dead point and improves the working stability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 The overall structure of the breathing waveform simulation device disclosed in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0036] Figure 2 for Figure 1 The schematic diagram of the exploded structure of the respiratory waveform simulation device shown;

[0037] Figure 3 for Figure 1 The structural schematic diagram of the screw nut transmission mechanism and the guide mechanism of the respiratory waveform simulation device shown;

[0038] Figure 4 It is a structural schematic diagram of a rotation speed measuring mechanism of a respiratory waveform simulation device disclosed in an embodiment of the utility model;

[0039] Figure 5 The overall structure of the breathing waveform simulation device disclosed in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0040] Figure 6 for Figure 5 Schematic diagram of the decomposed structure of the respiratory waveform simulation device shown.

[0041] Figure 1-Figure 6 The meanings of the reference numerals in the figure are as follows:

[0042] Z1 is the cylinder, Z2 is the screw nut transmission mechanism, Z3 is the driving mechanism, Z4 is the guide mechanism, Z5 is the speed measurement mechanism, and Z6 is the base plate assembly;

[0043] Q1 is the piston rod, Q2 is the cylinder body, Q3 is the first end cover, Q4 is the second end cover, Q5 is the piston, Q6 is the cylinder connecting rod, Q7 is the cylinder connecting rod fixing part, Q8 is the piston ring, Q9 is the sealing ring, and Q10 is the first bearing;

[0044] S1 is a fixed top screw, S2 is a fastener, S3 is a position detection element, S4 is a first retaining spring, S5 is a spring, S6 is a second bearing, S7 is a slider, S8 is a third bearing, S9 is a position detection element fixing part, S10 is a lead screw, S11 is a second guide rod, S12 is a transmission nut, S13 is a transmission nut fixing part, S14 is a fourth bearing, S15 is a drive motor, S16 is a motor support, S17 is a support part, S18 is a second retaining spring, S19 is a gasket, S2 0 is the second pulley, S21 is the flat key, S22 is the second pulley, S23 is the pulley fixing screw, S24 is the belt, S25 is the fixing nut, S26 is the speed measuring mechanism support, S27 is the bottom shell, S28 is the rotary encoder, S29 is the encoder reader, S30 is the reader fixing part, S31 is the speed measuring mechanism housing, S32 is the motor fixing screw, S33 is the encoder fixing part, S34 is the fixing part, S35 is the first guide rod, and S36 is the motor controller;

[0045] B1 is the base plate and B2 is the foot. DETAILED DESCRIPTION

[0046] In addition to the problems mentioned in the background technology, the prior art also has the following problems: if the motor of the crank rocker mechanism works at a uniform speed, the output sinusoidal wave shape cannot be symmetrical; if the motor moves at a variable speed, the requirements for the motor need to be increased, and the torque of the motor varies greatly. When the motor power is limited, the law of motor speed change needs to be calculated by superimposing multiple function formulas, and the reliability will decrease.

[0047] With the development of ventilators and the improvement and standardization of ventilator technical index inspection requirements, the specialization and standardization of ventilator testing equipment is particularly important. According to the standard "YY 9706.270-2021 Medical Electrical Equipment" Part 2-70 "Special requirements for basic safety and basic performance of sleep apnea therapy equipment", the equipment requirements are an output tidal volume of 500mL; a breathing ratio of 1:1; a sine wave of gas breathing; and a breathing rate of 10 times per minute, 15 times per minute, and 20 times per minute. The core of this utility model is to provide a respiratory waveform simulation device to detect the ventilator to improve its working reliability.

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] like Figure 1 As shown, an embodiment of the utility model discloses a breathing waveform simulation device, including a cylinder Z1, a screw nut transmission mechanism Z2, a driving mechanism Z3 and a guiding mechanism Z4.

[0050] like Figure 2 As shown, the cylinder Z1 includes a cylinder body Q2, a piston rod Q1, a piston Q5, a piston ring Q8, a first end cover Q3 and a second end cover Q4, the first end cover Q3 and the second end cover Q4 are respectively arranged at the two ends of the cylinder body Q2, and the second end cover Q4 is provided with an air inlet and an outlet, and the air inlet and an outlet are used to connect the ventilator. In order to ensure the sealing performance, a sealing ring Q9 is provided at the connection between the first end cover Q3 and the second end cover Q4 and the cylinder body Q2, and the two are connected by a cylinder connecting rod Q6, and the cylinder connecting rod Q6 is fixed to the first end cover Q3 and the second end cover Q4 by a cylinder connecting rod fastener Q6. The piston ring Q8 is fixed to the piston Q5, and the piston Q5 is fixed to one end of the piston rod Q1 by a nut and a gasket. The other end of the piston rod Q1 extends out of the first end cover Q3 and is connected to the transmission nut S12. In order to reduce friction, a first bearing Q10 is arranged between the piston rod Q1 and the first end cover Q3. In order to prevent the first bearing Q10 from sliding off the first end cover Q3, a first retaining spring, a second retaining spring and a wave spring are arranged between the first bearing Q10 and the first end cover Q3.

[0051] The piston rod Q1 of the cylinder Z1 is connected to the transmission nut S12 of the screw-nut transmission mechanism Z2, and the screw S10 of the screw-nut transmission mechanism Z2 is rotatably connected to the cylinder Z1. In some embodiments, a third bearing S8 that cooperates with the screw S10 is provided on the cylinder Z1. The setting of the third bearing S8 can reduce the friction force when the screw S10 and the cylinder Z1 rotate, so that the rotation of the screw S10 is smoother.

[0052] The drive mechanism Z3 is connected to the screw nut transmission mechanism Z2 in transmission, and the guide mechanism Z4 is connected to the screw nut transmission mechanism Z2 through the transmission nut S12, and is connected to the cylinder Z1 to prevent the piston rod Q1 from rotating. It should be noted that the drive mechanism Z2 has a variety of setting schemes, and the motor can be directly connected to the screw S10 to drive the screw S10 to rotate, or the motor can be driven to rotate the screw S10 through a gear mechanism, or the motor can be driven to rotate the screw S10 through a belt, which is not specifically limited here. In order to improve the transmission efficiency, the screw nut transmission mechanism Z2 is preferably a ball screw.

[0053] When in use, the drive mechanism Z3 is turned on, and the drive mechanism Z3 drives the screw S10 to rotate. Under the action of the guide mechanism Z4, the transmission nut S12 drives the piston rod Q1 to reciprocate along the axial direction of the screw S10, changing the volume of the cylinder Z1, generating a breathing airflow, and the breathing airflow flows out from the air inlet.

[0054] The sinusoidal breathing waveform simulation device disclosed in the embodiment of the utility model has a simple structure and is easy to operate. It adopts a screw nut transmission mechanism Z2 to drive the piston rod to move back and forth. Compared with the crank rocker mechanism, it eliminates the dead point and improves the working stability and reliability of the device.

[0055] like Figure 5-Figure 6 As shown, in a specific embodiment of the utility model, the guide mechanism Z4 includes a fixing member S34 and a first guide rod S35. Specifically, the transmission nut S12 is fixed to the fixing member S34 through the transmission nut fixing member S13, and the piston rod Q1 is fixed to the fixing member S34, and a detachable connection is specifically adopted. One end of the first guide rod S35 is fixed to the fixing member S34, and the other end extends into the cylinder Z1 and slides with the cylinder Z1. In some embodiments, the number of the first guide rods S35 is two and they are respectively arranged on both sides of the piston rod Q1.

[0056] like Figure 2-Figure 3 As shown, in some embodiments, the guide mechanism Z4 includes a support member S17, a second guide rod S11 and a slider S7. Specifically, the support member S17 is arranged opposite to the cylinder Z1 and is arranged at the end of the piston rod Q1 extending outward, and the lead screw S10 is rotatably connected to the support member S17. The slider S7 is arranged between the support member S17 and the cylinder Z1, the transmission nut S12 is fixed to the slider S7 through the transmission nut fixing member S13, the piston rod Q1 and the slider S7 are detachably connected, one end of the second guide rod S11 is fixed to the cylinder Z1, and the other end is fixed to the support member S17, specifically by fixing the top screw S1. The extension direction of the second guide rod S11 is parallel to the axial direction of the piston rod Q1, and the slider S7 is slidably matched with the second guide rod S11.

[0057] In order to reduce the friction between the slider S7 and the second guide rod S11, the slider S7 is provided with a second bearing S6. In order to prevent the second bearing S6 from sliding on the slider S7, the second bearing S6 is provided with a first retaining spring S4 and a spring sheet S5. The spring sheet S5 is used to squeeze the first retaining spring S4 and the second bearing S6 to ensure that the second bearing S6 does not slide in the slider S7. A fourth bearing S14 is provided at one end of the sliding fit between the lead screw S10 and the support member S17. In order to prevent the fourth bearing S14 from falling off the lead screw S10, a second retaining spring S18 and a gasket S19 are also provided. The driving mechanism Z3 drives the lead screw S10 to rotate, thereby driving the slider S7 to move linearly along the second guide rod S11, and then driving the piston rod Q1 to move back and forth along the second guide rod S11. The setting of the slider S7 and the second guide rod S11 can prevent the piston rod Q1 from rotating.

[0058] On the basis of the above embodiment, the number of the second guide rods S11 is two, and the lead screw S10 is disposed between the two second guide rods S11.

[0059] In order to facilitate the connection between the piston rod Q1 and the slider S7, and to make the breathing waveform simulation device applicable to a variety of cylinders Z1, in some embodiments, the slider S7 is provided with a groove for fixing the piston rod Q1, and the piston rod Q1 is fixed to the groove by a fastener S2. Specifically, the groove is provided in the extension direction of the piston rod Q1, and the fastener S2 can be a nut, and the piston rod Q1 is provided with a thread that matches the nut. The piston rod Q1 and the slider S7 are detachably connected, and this part of the device can also operate independently without the cylinder Z1. At the same time, it is convenient to maintain and replace cylinders Z1 of different models. At the same time, the setting of the groove can reduce the problem of the connection point of the slider S7 and the piston rod Q1 not being concentric.

[0060] In some specific embodiments, the drive mechanism Z3 includes a drive motor S15, a first pulley S22, a second pulley S20 and a belt S24. Specifically, the drive motor S15 is fixed to the motor support S16 by a motor fixing screw S32. The first pulley S22 is fixedly connected to the output shaft of the drive motor S15 by a flat key S21 and a pulley fixing top screw S23, and the second pulley S20 is fixedly connected to the lead screw S10 by a flat key S21 and a fixing nut S25. In order to prevent the fixing nut S25 from loosening, a gasket S19 is provided between the fixing nut S25 and the lead screw S10. The belt S24 is transmission-connected to the first pulley S22 and the second pulley S20. The rotation speed of the screw S10 and the movement speed of the transmission nut S12 are in a proportional linear relationship, and the rotation speed of the screw S10 and the rotation speed of the drive motor S15 are also in a proportional linear relationship. Therefore, the speed adjustment of the entire system is in a proportional linear relationship, and the control is easier to achieve. The drive motor S15 only needs to maintain a uniform speed. Compared with the existing technology, the reliability is higher.

[0061] The breathing waveform simulation device disclosed in the embodiment of the utility model further includes a control mechanism, which includes a motor controller S36. The motor controller S36 is electrically connected to the drive motor S15 to control the rotation and speed of the drive motor.

[0062] In order to detect whether the position of the slider S7 reaches the end of the blowing process, a position detection element S3 is provided on the first end cover Q3 of the cylinder Z1. The position detection element S3 is fixed to the first end cover Q3 through a position detection element fixing member S9, and the position detection element S3 is electrically connected to the control mechanism.

[0063] In order to measure the rotation angle and rotation speed of the lead screw S10, the breathing waveform simulation device disclosed in the embodiment of the utility model further includes a rotation speed measurement mechanism Z5. Figure 3-Figure 4 As shown, the speed measuring mechanism Z5 includes a rotary encoder S28, an encoder reader S29, a speed measuring mechanism support S26 and a speed measuring mechanism housing S31. Specifically, the second pulley S20 is arranged between the speed measuring mechanism support S26 and the support member S17. After passing through the second pulley S20, the lead screw S10 passes through the axial hole opened on the speed measuring mechanism support S26, and is connected to the encoder S28 through the axial hole of the bottom shell S27 fixed to the speed measuring mechanism support S26. The axial hole of the rotary encoder S28 is sleeved on the lead screw S10, and it is fixed by using the encoder fixing member S33, which can be a top screw. The encoder reader S29 is fixed on the bottom shell S27 using the reader fixing member S30, and the disc of the rotary encoder S28 is embedded in the middle of the detection gap of the encoder reader S29. After the fixing is completed, the speed measuring mechanism housing S31 can be buckled on the bottom shell S27, and the encoder reader S29 is electrically connected to the control mechanism.

[0064] like Figure 1-Figure 2 As shown, in some embodiments, it also includes a base plate assembly Z6, the basic assembly Z6 includes a bottom plate B1 and a base foot B2 arranged on the bottom plate B1, and the cylinder Z1, the support S17, the drive motor S15 and the speed measurement mechanism support S26 are all arranged on the bottom plate B1.

[0065] When in use, the operator sets the required information through the control mechanism, the motor controller S36 controls the operation of the drive motor S15, and during operation, the position detection element S3 detects the position of the slider S7, the rotary encoder S28 and the encoder reader S29 cooperate to detect the rotation angle and rotation speed of the screw S10, and the detected position, angle and speed signals are fed back to the control mechanism, and the control mechanism adjusts the system according to the feedback data.

[0066] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0068] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0069] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A breathing waveform simulation device, characterized in that: include: A cylinder (Z1), wherein the cylinder (Z1) comprises an air inlet and an air outlet for connecting to a ventilator; A screw-nut transmission mechanism (Z2), wherein the piston rod (Q1) of the cylinder (Z1) is connected to the transmission nut (S12) of the screw-nut transmission mechanism (Z2), and the screw (S10) of the screw-nut transmission mechanism (Z2) is rotationally connected to the cylinder (Z1); A driving mechanism (Z3), the driving mechanism (Z3) being drivingly connected to the screw nut transmission mechanism (Z2); A guide mechanism (Z4), wherein the guide mechanism (Z4) is connected to the screw nut transmission mechanism (Z2) via the transmission nut (S12) and is used to prevent the piston rod (Q1) from rotating.

2. The breathing waveform simulation device according to claim 1, characterized in that: The guiding mechanism (Z4) comprises: A fixing member (S34), the transmission nut (S12) is fixed on the fixing member (S34), and the piston rod (Q1) is fixed on the fixing member (S34); A first guide rod (S35), one end of which is fixed on the fixing member (S34), and the other end of which extends into the cylinder (Z1) and is slidably matched with the cylinder (Z1).

3. The breathing waveform simulation device according to claim 1, characterized in that: The guiding mechanism (Z4) comprises: A support member (S17), the support member (S17) being arranged opposite to the cylinder (Z1), and the lead screw (S10) being rotatably connected to the support member (S17); a second guide rod (S11), one end of the second guide rod (S11) being fixed to the cylinder (Z1), and the other end of the second guide rod (S11) being fixed to the support member (S17), and an extending direction of the second guide rod (S11) being parallel to an axial direction of the piston rod (Q1); The slider (S7) is fixed to the transmission nut (S12), the piston rod (Q1) is detachably connected to the slider (S7), and the slider (S7) is slidably matched to the second guide rod (S11).

4. The breathing waveform simulation device according to claim 3, characterized in that: The number of the second guide rods (S11) is two, and the lead screw (S10) is arranged between the two second guide rods (S11).

5. The breathing waveform simulation device according to claim 3, characterized in that: The sliding block (S7) is provided with a groove for fixing the piston rod (Q1), and the piston rod (Q1) is fixed to the groove via a fastener (S2).

6. The breathing waveform simulation device according to claim 3, characterized in that: The driving mechanism (Z3) comprises: Driving motor (S15); A first pulley (S22), the first pulley (S22) being fixedly connected to an output shaft of the driving motor (S15); A second pulley (S20), the second pulley (S20) being fixedly connected to the lead screw (S10); A belt (S24), wherein the belt (S24) is drivingly connected to the first pulley (S22) and the second pulley (S20).

7. The breathing waveform simulation device according to claim 6, characterized in that: It also includes a control mechanism, which is electrically connected to the drive motor (S15).

8. The breathing waveform simulation device according to claim 7, characterized in that: A position detection element (S3) is provided on the first end cover (Q3) of the cylinder (Z1), and the position detection element (S3) is electrically connected to the control mechanism.

9. The breathing waveform simulation device according to claim 7, characterized in that: It also includes a rotation speed measuring mechanism (Z5), the rotation speed measuring mechanism (Z5) including: A rotary encoder (S28), wherein the rotary encoder (S28) is arranged on the lead screw (S10); An encoder reader (S29), the rotary encoder (S28) is connected to the encoder reader (S29), and the encoder reader (S29) is electrically connected to the control mechanism; A rotation speed measuring mechanism support (S26), the encoder reader (S29) is arranged on the rotation speed measuring mechanism support (S26), the lead screw (S10) is rotationally connected to the rotation speed measuring mechanism support (S26), and the second pulley (S20) is arranged between the rotation speed measuring mechanism support (S26) and the support member (S17); A rotation speed measuring mechanism housing (S31), wherein the rotation speed measuring mechanism housing (S31) is disposed outside the rotary encoder (S28) and the encoder reader (S29).

10. The breathing waveform simulation device according to claim 9, characterized in that: It also includes a base plate assembly (Z6), the base plate assembly (Z6) including a bottom plate (B1) and a bottom foot (B2) arranged on the bottom plate (B1), and the cylinder (Z1), the support member (S17), the drive motor (S15) and the rotation speed measurement mechanism support (S26) are all arranged on the bottom plate (B1).

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